Celestial Atlas
(NGC 2500 - 2549) ←NGC Objects: NGC 2550 - 2599 Link for sharing this page on Facebook→ (NGC 2600 - 2649)
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Page last updated Dec 2, 2018
Updated formatting to current standard, checked Dreyer NGC entries, Steinicke databases
Updated Corwin positions, added wide-field images/captions/tags
NEXT: Update other historical references, uncertain IDs
NEXT: Add more pix, captions, tags; prove identifications (where possible), add physical data

NGC 2550 (= PGC 23604)
Discovered (Sep 7, 1885) by
Lewis Swift
A magnitude 12.8 spiral galaxy (type SAB(rs)b?) in Camelopardalis (RA 08 24 33.9, Dec +74 00 43)
Historical Identification: Per Dreyer, NGC 2550 (Swift list II (#34), 1860 RA 08 08 03, NPD 15 33.3) is "most extremely faint, pretty small, considerably extended".
Physical Information: Based on a recessional velocity of 2270 km/sec, NGC 2550 is about 100 million light years away, in reasonable agreement with redshift-independent distance estimates of 115 to 120 million light years. Given that and its apparent size of 1.0 by 0.4 arcmins, it is about 30 thousand light years across.
DSS image of region near spiral galaxy NGC 2550
Above, a 12 arcmin wide DSS image centered on NGC 2550
Below, a 1.5 arcmin wide DSS image of the galaxy
DSS image of spiral galaxy NGC 2550
Below, a 1.5 arcmin wide PanSTARRS image of the galaxy
PanSTARRS image of spiral galaxy NGC 2550

PGC 23781 (= "NGC 2550A")
Not an NGC object, but listed here since sometimes called NGC 2550A
A magnitude 12.7 spiral galaxy (type Sc) in
Camelopardalis (RA 08 28 39.9, Dec +73 44 53)
Physical Information: Apparent size 1.6 by 1.4 arcmin. Just as close or closer to NGC 2551 than NGC 2550, so its sometime designation as NGC 2550A is neither useful nor significant.
DSS image of region near spiral galaxy PGC 23781, also sometimes called NGC 2550A
Above, a 12 arcmin wide DSS image centered on PGC 23781

NGC 2551 (= PGC 23608)
Discovered (Aug 9, 1882) by
Wilhelm Tempel
Also observed (Sep 7, 1885) by Lewis Swift
A magnitude 12.1 spiral galaxy (type Sa) in Camelopardalis (RA 08 24 50.3, Dec +73 24 43)
Historical Identification: Per Dreyer, NGC 2551 (Tempel list VI (#2), Swift list II (#??), 1860 RA 08 08 25, NPD 16 08.9) is "very faint, small, faint star in centre", "center" being shown as spelled by Dreyer (and in modern British English)..
Physical Information: Apparent size 1.6 by 1.0 arcmin
DSS image of region near spiral galaxy NGC 2551
Above, a 12 arcmin wide DSS image centered on NGC 2551

NGC 2552 (= PGC 23340)
Discovered (Mar 9, 1788) by
William Herschel
A magnitude 12.1 spiral galaxy (type SBm) in Lynx (RA 08 19 20.5, Dec +50 00 35)
Historical Identification: Per Dreyer, NGC 2552 (= GC 1639 = WH III 711, 1860 RA 08 08 46, NPD 39 32.6) is "extremely faint, considerably large, a little extended 45°".
Physical Information: Apparent size 3.6 by 2.1 arcmin
SDSS image of region near spiral galaxy NGC 2552
Above, a 12 arcmin wide SDSS image centered on NGC 2552

NGC 2553 (= PGC 23240)
Discovered (Feb 17, 1865) by
Albert Marth
A magnitude 13.9 spiral galaxy (type S) in Cancer (RA 08 17 35.0, Dec +20 54 11)
Historical Identification: Per Dreyer, NGC 2553 (= GC 5412, Marth #116, 1860 RA 08 09 22, NPD 68 38) is "very faint, small, gradually a little brighter middle".
Physical Information: Apparent size 1.7 by 0.8 arcmin
SDSS image of region near spiral galaxy NGC 2553
Above, a 12 arcmin wide SDSS image centered on NGC 2553

NGC 2554 (= PGC 23256)
Discovered (Feb 28, 1785) by
William Herschel
Also observed (Feb 24, 1827) by John Herschel
Also observed (date?) by Heinrich d'Arrest
A magnitude 12.0 lenticular galaxy (type (R)SAB0(rs)a? pec) in Cancer (RA 08 17 53.5, Dec +23 28 20)
Historical Identification: Per Dreyer, NGC 2554 (= GC 1640 = JH 497 = WH II 303, 1860 RA 08 10 36, NPD 66 05.9) is "faint, small, round, much brighter middle, mottled but not resolved". The second IC states (per d'Arrest) "Minute of RA is 9, not 10".
Physical Information: Apparent size of about 3.6 by 3.0 arcmin (from the images below). Vr = 4160 km/sec.
SDSS image of region near lenticular galaxy NGC 2554
Above, a 12 arcmin wide SDSS image centered on NGC 2554
Below, a 4 arcmin wide SDSS image of the galaxy, also showing PGC 23251
SDSS image of lenticular galaxy NGC 2554, also showing PGC 23251

PGC 23251 = PGC 213463
Not an NGC object but listed here as an apparent companion of
NGC 2554
A magnitude 15.5(?) lenticular galaxy (type E/S0) in Cancer (RA 08 17 47.5, Dec +23 28 36)
Physical Information: Vr = 3855 km/sec, about 300 km/sec less than that of NGC 2554, and within the general range of galaxy peculiar velocities, so quite possibly a companion of the larger galaxy, and perhaps the cause of that object's complex structure. Apparent size of about 1.8 by 1.4 arcmin (from the image below).
SDSS image of lenticular galaxy PGC 23251
Above, a 0.4 arcmin wide SDSS image of PGC 23251; for wider=field images see NGC 2554

NGC 2555 (= PGC 23259)
Discovered (Dec 20, 1784) by
William Herschel
Also observed (Jan 27, 1832) by John Herschel
A magnitude 12.2 spiral galaxy (type SBab) in Hydra (RA 08 17 56.4, Dec +00 44 44)
Historical Identification: Per Dreyer, NGC 2555 (= GC 1641 = JH 498 = WH III 256, 1860 RA 08 10 44, NPD 88 48.8) is "very faint, considerably small, irregular figure, 3 small (faint) stars involved?".
Physical Information: Apparent size 1.9 by 1.4 arcmin
SDSS image of region near spiral galaxy NGC 2555
Above, a 12 arcmin wide SDSS image centered on NGC 2555

NGC 2556 (= PGC 23325)
Discovered (Feb 17, 1865) by
Albert Marth
Also observed (Jan 27, 1889) by Edward Barnard
A magnitude 14.5 lenticular galaxy (type S0) in Cancer (RA 08 19 00.8, Dec +20 56 13)
Historical Identification: Per Dreyer, NGC 2556 (= GC 5413, Marth #117, 1860 RA 08 10 49, NPD 68 36) is "very faint, very small".
Physical Information: Apparent size 0.4 by 0.2 arcmin
SDSS image of region near lenticular galaxy NGC 2556
Above, a 12 arcmin wide SDSS image centered on NGC 2556

NGC 2557 (= PGC 23329)
Discovered (Feb 2, 1877) by
Édouard Stephan
A magnitude 13.2 lenticular galaxy (type SB0) in Cancer (RA 08 19 10.8, Dec +21 26 09)
Historical Identification: Per Dreyer, NGC 2557 (= GC 5414, Stephan list VIII (#29), 1860 RA 08 10 59, NPD 68 06.9) is "extremely faint, extremely small, round, a little brighter middle".
Physical Information: Apparent size 1.2 by 1.0 arcmin
SDSS image of region near lenticular galaxy NGC 2557, also showing IC 2293
Above, a 12 arcmin wide SDSS image centered on NGC 2557, also showing IC 2293
(The "bright" star at upper right is magnitude 7.9 HD 69698)

NGC 2558 (= PGC 23337)
Discovered (Feb 13, 1787) by
William Herschel
Also observed (Mar 17, 1831) by John Herschel
A magnitude 13.0 spiral galaxy (type Sab) in Cancer (RA 08 19 12.8, Dec +20 30 39)
Historical Identification: Per Dreyer, NGC 2558 (= GC 1642 = JH 499 = WH III 606, 1860 RA 08 11 07, NPD 69 03.2) is "very faint, small, round, suddenly brighter middle, stellar".
Physical Information: Apparent size 1.8 by 1.3 arcmin
SDSS image of region near spiral galaxy NGC 2558
Above, a 12 arcmin wide SDSS image centered on NGC 2558

NGC 2559 (= PGC 23222)
Discovered (Feb 5, 1837) by
John Herschel
A magnitude 10.9 spiral galaxy (type SBbc) in Puppis (RA 08 17 06.1, Dec -27 27 25)
Historical Identification: Per Dreyer, NGC 2559 (= GC 1643 = JH 3118, 1860 RA 08 11 21, NPD 117 02.2) is "faint, pretty large, gradually much brighter middle, among 60 stars".
Physical Information: Apparent size of about 5.6 by 2.5 arcmin (from the images below), including the fainter outer regions.
DSS image of region near spiral galaxy NGC 2559
Above, a 12 arcmin wide DSS image centered on NGC 2559
Below, a 6 arcmin wide DSS image of the galaxy
DSS image of spiral galaxy NGC 2559Below, a 5.75 arcmin wide image of the galaxy (Image Credit & © Carnegie-Irvine Galaxy Survey; used by permission)
Carnegie-Irvine Galaxy Survey image of spiral galaxy NGC 2559

NGC 2560 (= PGC 23367)
Discovered (Mar 17, 1862) by
Heinrich d'Arrest
A magnitude 13.3 lenticular galaxy (type S0/a) in Cancer (RA 08 19 51.9, Dec +20 59 06)
Historical Identification: Per Dreyer, NGC 2560 (= GC 1644, d'Arrest, 1860 RA 08 11 42, NPD 68 34.8) is "faint, pretty large".
Physical Information: Apparent size 1.4 by 0.3 arcmin
SDSS image of region near lenticular galaxy NGC 2560
Above, a 12 arcmin wide SDSS image centered on NGC 2560

NGC 2561 (= PGC 23351)
Discovered (Mar 23, 1887) by
Lewis Swift
A magnitude 13.2 spiral galaxy (type SBc) in Hydra (RA 08 19 37.0, Dec +04 39 26)
Historical Identification: Per Dreyer, NGC 2561 (Swift list VI (#31), 1860 RA 08 12 06, NPD 84 54.4) is "very faint, small, round, making a triangle with 2 stars".
Physical Information: Apparent size 1.1 by 0.6 arcmin.
SDSS image of region near spiral galaxy NGC 2561
Above, a 12 arcmin wide SDSS image centered on NGC 2561

NGC 2562 (= PGC 23395)
Discovered (Feb 13, 1787) by
William Herschel
Also observed (Feb 24, 1827) by John Herschel
A magnitude 12.9 lenticular galaxy (type S0/a) in Cancer (RA 08 20 23.7, Dec +21 07 53)
Historical Identification: Per Dreyer, NGC 2562 (= GC 1645 = JH 500 = WH III 607, 1860 RA 08 12 13, NPD 68 25.9) is "very faint, considerably small, round".
Physical Information: Apparent size 1.0 by 0.7 arcmin.
SDSS image of region near lenticular galaxy NGC 2562, also showing NGC 2563
Above, a 12 arcmin wide SDSS image centered on NGC 2562, also showing NGC 2563

NGC 2563 (= PGC 23404)
Discovered (Feb 13, 1787) by
William Herschel
Also observed (Feb 24, 1827) by John Herschel
A magnitude 12.2 lenticular galaxy (type S0) in Cancer (RA 08 20 35.7, Dec +21 04 04)
Historical Identification: Per Dreyer, NGC 2563 (= GC 1646 = JH 501 = WH II 634, 1860 RA 08 12 25, NPD 68 29.7) is "considerably faint, small, round, brighter middle".
Physical Information: Apparent size 2.0 by 1.7 arcmin.
SDSS image of region near lenticular galaxy NGC 2563, also showing NGC 2562
Above, a 12 arcmin wide SDSS image centered on NGC 2563, also showing NGC 2562

NGC 2564 (= PGC 23290)
Discovered (Jan 28, 1837) by
John Herschel
A magnitude 12.4 lenticular galaxy (type E/S0) in Puppis (RA 08 18 30.0, Dec -21 48 58)
Historical Identification: Per Dreyer, NGC 2564 (= GC 1647 = JH 3119, 1860 RA 08 12 28, NPD 111 22.6) is "very faint, small, round, gradually brighter middle, among many stars".
Physical Information: Apparent size of about 1.1 by 0.8 arcmin (from the images below).
DSS image of region near lenticular galaxy NGC 2564
Above, a 12 arcmin wide DSS image centered on NGC 2564
Below, a 1.2 arcmin wide DSS image of the galaxy
DSS image of lenticular galaxy NGC 2564
Below, a 0.5 arcmin wide SDSS image of the core of the galaxy
PanSTARRS image of the core of lenticular galaxy NGC 2564

NGC 2565 (= PGC 23362)
Discovered (1886) by
Gerhard Lohse
A magnitude 12.6 spiral galaxy (type (R)SB(r)bc?) in Cancer (RA 08 19 48.3, Dec +22 01 53)
Historical Identification: Per Dreyer, NGC 2565 (J. G. Lohse, 1860 RA 08 12 30, NPD 67 30.5) is "faint, binuclear".
Physical Information: Vr = 3580 km/sec Apparent size of about 1.7 by 0.7 arcmin (from the images below).
SDSS image of region near spiral galaxy NGC 2565, also showing PGC 23357
Above, a 12 arcmin wide SDSS image centered on NGC 2565, also showing PGC 23357
Below, a 2 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy NGC 2565

PGC 23357
Not an NGC object but listed here since an apparent companion of
NGC 2565
A magnitude 15.3 spiral galaxy (type SBc? pec) in Cancer (RA 08 19 41.3, Dec +22 02 31)
Physical Information: Vr 3450 km/sec, apparent size of about 0.45 by 0.2 arcmin (from the images below). Since both it and its larger neighbor have similar recessional velocities and unusual structures, they are probably a pair that has undergone some kind of interaction in the not too distant past.
SDSS image of spiral galaxy PGC 23357
Above, a 0.75 arcmin wide SDSS image of PGC 23357; for a wide-field image, see NGC 2565

NGC 2566 (= PGC 23303)
Discovered (Mar 6, 1785) by
William Herschel
Also observed (date?) by Herbert Howe
A magnitude 11.0 spiral galaxy (type SB(rs)ab pec) in Puppis (RA 08 18 45.6, Dec -25 29 58)
Historical Identification: Per Dreyer, NGC 2566 (= GC 1648 = WH III 288, 1860 RA 08 12 49, NPD 115 01.9) is "very faint, considerably large, extremely mottled but not resolved". The second IC adds (per Howe) "very small nebula or nebulous 11th magnitude star with 12th magnitude star close".
Physical Information: Steinicke lists an apparent size of 2.9 by 1.7 arcmin, but this must refer only to the brighter inner portion of the galaxy, as it has huge extended arms to its northwest and southeast, and strange linear extensions to the southwest.
DSS image of region near spiral galaxy NGC 2566
Above, a 12 arcmin wide DSS image centered on NGC 2566
Below, a 6 arcmin wide image of the galaxy (Image Credit & © Carnegie-Irvine Galaxy Survey; used by permission)
Carnegie-Irvine Galaxy Survey image of spiral galaxy NGC 2566

NGC 2567 (= OCL 708)
Discovered (Mar 4, 1793) by
William Herschel
Also observed (Jan 6, 1831) by John Herschel
A magnitude 7.4 open cluster (type III2m) in Puppis (RA 08 18 34.0, Dec -30 38 00)
Historical Identification: Per Dreyer, NGC 2567 (= GC 1649 = JH 503 = JH 3120 = WH VII 64, 1860 RA 08 12 58, NPD 120 12.3) is "a cluster, pretty large, pretty rich, a little compressed, irregularly round, stars from 11th to 14th magnitude".
Physical Information: Apparent size 11 arcmin.
DSS image of region near open cluster NGC 2567
Above, a 15 arcmin wide DSS image centered on NGC 2567

NGC 2568 (= OCL 727)
Discovered (1881) by
Edward Barnard
A magnitude 10.7 open cluster (type I3p) in Puppis (RA 08 18 17.0, Dec -37 06 18)
Historical Identification: Per Dreyer, NGC 2568 (Barnard (c), 1860 RA 08 13 03, NPD 126 41.4) is "very faint, pretty large, faint star involved".
Physical Information: Apparent size 3.0 arcmin.
DSS image of region near open cluster NGC 2568
Above, a 12 arcmin wide DSS image centered on NGC 2568

NGC 2569 (= PGC 23442)
Discovered (Feb 19, 1862) by
Heinrich d'Arrest
A magnitude 14.3 lenticular galaxy (type E/S0) in Cancer (RA 08 21 21.2, Dec +20 52 03)
Historical Identification: Per Dreyer, NGC 2569 (= GC 1650, d'Arrest, 1860 RA 08 13 11, NPD 68 41.8) is "very faint, considerably extended, 3 very small (faint) stars to east".
Physical Information: Apparent size 0.6 by 0.5 arcmin.
SDSS image of region near lenticular galaxy NGC 2569, also showing NGC 2570
Above, a 12 arcmin wide SDSS image centered on NGC 2569, also showing NGC 2570

NGC 2570 (= PGC 23443)
Discovered (Feb 20, 1873) by
Ralph Copeland
A magnitude 14.5 spiral galaxy (type Sab) in Cancer (RA 08 21 22.5, Dec +20 54 38)
Historical Identification: Per Dreyer, NGC 2570 (= GC 5415, Copeland (using Lord Rosse's Leviathan), 1860 RA 08 13 11, NPD 68 38.9) is "most extremely faint, large, round, northern of 2", the other being NGC 2569.
Physical Information: Apparent size 1.1 by 0.6 arcmin.
SDSS image of region near spiral galaxy NGC 2570, also showing NGC 2569
Above, a 12 arcmin wide SDSS image centered on NGC 2570, also showing NGC 2569

NGC 2571 (= OCL 701)
Discovered (Mar 3, 1793) by
William Herschel
Also observed (Jan 6, 1831) by John Herschel
A magnitude 7.0 open cluster (type IV1p) in Puppis (RA 08 18 57.0, Dec -29 45 06)
Historical Identification: Per Dreyer, NGC 2571 (= GC 1651 = JH 502 = WH VI 39, 1860 RA 08 13 15, NPD 119 18.6) is "a cluster, very large, considerably rich, a little compressed, stars from 9th magnitude".
Physical Information: Apparent size 7.0 arcmin.
DSS image of region near open cluster NGC 2571
Above, a 12 arcmin wide DSS image centered on NGC 2571

NGC 2572 (= PGC 23441)
Discovered (Feb 2, 1877) by
Édouard Stephan
A magnitude 13.8 spiral galaxy (type Sa) in Cancer (RA 08 21 24.6, Dec +19 08 52)
Historical Identification: Per Dreyer, NGC 2572 (= GC 5416, Stephan list VIII (#30), 1860 RA 08 13 20, NPD 70 24.7) is "extremely faint, very small, irregular figure, 13th magnitude star attached".
Physical Information: Apparent size 1.3 by 0.5 arcmin.
SDSS image of region near spiral galaxy NGC 2572
Above, a 12 arcmin wide SDSS image centered on NGC 2572

NGC 2573 (= PGC 6249), Polarissima Australis
Discovered (Mar 29, 1837) by
John Herschel
A magnitude 13.5 spiral galaxy (type SBc) in Octans (RA 01 42 09.5, Dec -89 20 04)
Historical Identification: Per Dreyer, NGC 2573 (= GC 1652 = JH 3176, 1860 RA 08 13±, NPD 179 41.1) is "faint, small, round, gradually a little brighter middle, Polarissima Australis".
Physical Information: Apparent size 1.9 by 0.7 arcmin. Due to its extreme southern position (whence its name, "Polarissima Australis") a striking example of the effect of precession on the apparent position of objects, having moved from about 8 hours RA in 1860 coordinates to about 2 hours in 2000 coordinates simply because the Pole is moving past the location of the galaxy.
DSS image of region near spiral galaxy NGC 2573, also known as Polarissima Australis
Above, a 12 arcmin wide DSS image centered on NGC 2573
Below, a 2.25 arcmin wide DSS image of the galaxy
DSS image of spiral galaxy NGC 2573, also known as Polarissima Australis

PGC 70680 (= "NGC 2573A")
Not an NGC object but listed here since sometimes called NGC 2573A
A magnitude 13.9 spiral galaxy (type SBb? pec) in
Octans (RA 23 12 27.6, Dec -89 07 34)
Physical Information: Based on a recessional velocity of 2475 km/sec, PGC 70680 is about 115 million light years away, in reasonable agreement with the 120 million light year recessional velocity distance estimate for PGC 70533. This supports the supposition, based on their distorted shapes, that they are gravitationally interacting. Given that and its apparent size of 2.1 by 0.6 arcmin, PGC 70680 is about 70 thousand light years across.
DSS image of region near spiral galaxy PGC 70680, sometimes called NGC 2573A, and PGC 70533, sometimes called NGC 2573B
Above, a 12 arcmin wide DSS image centered on PGC 70680, also showing PGC 70533
Below, a 3 arcmin wide DSS image of the apparently interacting pair of galaxies
DSS image of spiral galaxy PGC 70680, sometimes called NGC 2573A, and PGC 70533, sometimes called NGC 2573B

PGC 70533 (= "NGC 2573B")
Not an NGC object but listed here since sometimes sometimes called NGC 2573B
A magnitude 14.5 irregular galaxy (type IBm? pec) in
Octans (RA 23 07 37.4, Dec -89 07 00)
Physical Information: Based on a recessional velocity of 2560 km/sec, PGC 70533 is about 120 million light years away, in reasonable agreement with the 115 million light year recessional velocity distance estimate for PGC 70680, which see for images. This supports the supposition, based on their distorted shapes, that they are gravitationally interacting. (There is also a redshift-independent distance estimate of 100 million light years, but whatever the correct value, the pair of galaxies are probably at the same distance.) Given that and its apparent size of 1.5 by 0.5 arcmin, PGC 70533 is about 50 thousand light years across.

NGC 2574 (= PGC 23418)
Discovered (1886) by
Ormond Stone
A magnitude 12.3 spiral galaxy (type Sab) in Hydra (RA 08 20 48.1, Dec -08 55 07)
Historical Identification: Per Dreyer, NGC 2574 (Ormond Stone list II (#401), 1860 RA 08 14 09, NPD 98 31.5) is "extremely faint, pretty small, partially resolved (some stars seen), magnitude 7.5 star 5 arcmin to northeast".
Physical Information: Vr = 2865 km/sec. This is far lower than the 13685 km/sec recessional velocity of PGC 152175, so that galaxy is not a companion, but a far more distant background object. Apparent size 2.3 by 1.2 arcmin.
DSS image of region near spiral galaxy NGC 2574, also showing PGC 152175
Above, a 12 arcmin wide DSS image centered on NGC 2574, also showing PGC 152175

PGC 152175
Not an NGC object but listed here as an apparent companion of
NGC 2574
A magnitude 16(?) galaxy (type S0/a? Sa?) in Hydra (RA 08 20 42.6, Dec -08 54 49)
Physical Information: Apparent size of about 0.8 by 0.1 arcmin (from the images below). Vr = 13685 km/sec; z = 0.045648. Given the far larger recessional velocity of PGC 152175, it cannot be an actual companion of NGC 2574, but is a far more distant background object. Given the low quality of the images below, it is impossible to tell whether the galaxy is a lenticular galaxy (type S0/a?) or a spiral galaxy (type Sa?).
DSS image of galaxy PGC 152175
Above, a 1 arcmin wide DSS image of PGC 152175
Below, a 1 arcmin wide PanSTARRS image of the galaxy
PanSTARRS image of galaxy PGC 152175

NGC 2575 (= PGC 23501)
Discovered (Feb 23, 1878) by
Édouard Stephan
A magnitude 12.7 spiral galaxy (type Sc) in Cancer (RA 08 22 44.9, Dec +24 17 49)
Historical Identification: Per Dreyer, NGC 2575 (Stephan list IX (#14), 1860 RA 08 14 25, NPD 65 15.6) is "extremely faint, pretty large, irregularly round, several faint stars involved".
Physical Information: Apparent size 1.7 by 1.3 arcmin
SDSS image of region near spiral galaxy NGC 2575
Above, a 12 arcmin wide SDSS image centered on NGC 2575

NGC 2576 (= PGC 23512)
Discovered (Mar 29, 1865) by
Albert Marth
A magnitude 14.3 spiral galaxy (type Sb) in Cancer (RA 08 22 57.7, Dec +25 44 19)
Historical Identification: Per Dreyer, NGC 2576 (= GC 5417, Marth #118, 1860 RA 08 14 32, NPD 63 50) is "extremely faint, extremely small, stellar".
Physical Information: Apparent size 1.7 by 0.3 arcmin
SDSS image of region near spiral galaxy NGC 2576
Above, a 12 arcmin wide SDSS image centered on NGC 2576

NGC 2577 (= PGC 23498)
Discovered (Nov 16, 1784) by
William Herschel
Also observed (date?) by Herman Schultz
A magnitude 12.4 lenticular galaxy (type E/S0) in Cancer (RA 08 22 43.4, Dec +22 33 11)
Historical Identification: Per Dreyer, NGC 2577 (= GC 1653 = WH II 259, Schultz, 1860 RA 08 14 39, NPD 67 00.2) is "faint, small, irregular figure, mottled but not resolved".
Physical Information: Apparent size 1.8 by 1.1 arcmin
SDSS image of region near lenticular galaxy NGC 2577
Above, a 12 arcmin wide SDSS image centered on NGC 2577

NGC 2578 (= PGC 23440)
Discovered (Mar 8, 1793) by
William Herschel
Also observed (Feb 14, 1836) by John Herschel
A magnitude 12.6 lenticular galaxy (type SB0/a) in Puppis (RA 08 21 24.3, Dec -13 19 04)
Historical Identification: Per Dreyer, NGC 2578 (= GC 1654 = JH 3121 = WH III 902, 1860 RA 08 14 49, NPD 102 52.6) is "faint, very little extended, gradually brighter middle, mottled but not resolved, among 50 stars".
Physical Information: Apparent size 2.2 by 1.3 arcmin
DSS image of region near spiral galaxy NGC 2578, also showing PGC 23449
Above, a 12 arcmin wide DSS image centered on NGC 2578, also showing PGC 23449

PGC 23449
Not an NGC object but listed here as an apparent companion of
NGC 2578
A magnitude 14(?) spiral galaxy (type SB(rs)b?) in Puppis (08 21 33.5, Dec -13 21 04)
Physical Information:
PanSTARRS image of spiral galaxy PGC 23449
Above, a 1 arcmin wide PanSTARRS image of PGC 23449

NGC 2579 (= OCL 724)
Discovered (Feb 1, 1835) by
John Herschel
A magnitude 7.5 open cluster (type IV1p) and emission nebula in Puppis (RA 08 20 52.8, Dec -36 12 58)
Historical Identification: Per Dreyer, NGC 2579 (= GC 1655 = JH 3122, 1860 RA 08 15 35, NPD 125 46.6) is "a double star (h 4083) in a pretty small nebula, among 70 stars", (h 4083) referring to an entry in John Herschel's catalog of double stars, which was published (posthumously) in 1874.
Physical Information: Although Herschel cataloged this as a double star, it is a small group of stars surrounded by an emission nebula. In the image below the emission nebula is overexposed, and the stars are not visible; but additional images will be added to this entry, showing the stars as well as the nebula. Some images show the nebula as separate regions (particularly ones that also show the stars), but images showing the nebulae and not the stars appear to be a single nebula "separated" by clouds of obscuring material. The apparent size of about 2.5 by 1.5 arcmin for the brighter "pair" of nebulae, and about 3.3 by 3.2 arcmin for the fainter outer regions.
DSS image of region near open cluster and emission nebula NGC 2579
Above, a 12 arcmin wide DSS image centered on NGC 2579

NGC 2580 (= OCL 709)
Discovered (Feb 5, 1837) by
John Herschel
A magnitude 9.7 open cluster (type II2m) in Puppis (RA 08 21 29.0, Dec -30 17 48)
Historical Identification: Per Dreyer, NGC 2580 (= GC 1656 = JH 3123, 1860 RA 08 15 44, NPD 119 52.1) is "a cluster, considerably large, pretty rich, pretty compressed, round, stars of 12th magnitude".
Physical Information: Apparent size 8.0 arcmin
DSS image of region near open cluster NGC 2580
Above, a 12 arcmin wide DSS image centered on NGC 2580

NGC 2581 (= PGC 23599)
Discovered (Mar 7, 1885) by
Édouard Stephan
A magnitude 13.4 spiral galaxy (type SB?) in Cancer (RA 08 24 30.9, Dec +18 35 50)
Historical Identification: Per Dreyer, NGC 2581 (Stephan list XIII (#38), 1860 RA 08 16 29, NPD 70 57.1) is "very faint, very small, round, very faint star involved, faint star attached".
Physical Information: Apparent size 1.1 by 0.8 arcmin
SDSS image of spiral galaxy NGC 2581
Above, a 12 arcmin wide SDSS image of NGC 2581

NGC 2582 (=
IC 2359 = PGC 23630)
Discovered (Feb 22, 1789) by William Herschel (and later listed as NGC 2582)
Also observed (Mar 25, 1827) by John Herschel (and later listed as NGC 2582)
Discovered (Feb 13, 1901) by Max Wolf (and later listed as IC 2359)
A magnitude 13.0 spiral galaxy (type (R)SAB(s)ab) in Cancer (RA 08 25 12.1, Dec +20 20 05)
Historical Identification: Per Dreyer, NGC 2582 (= GC 1657 = JH 504 = WH III 753, 1860 RA 08 17 03, NPD 69 13.4) is "very faint, pretty small, round, gradually a little brighter middle, star 75 arcsec to west".
Physical Information: Based on a recessional velocity of 4440 km/sec, NGC 2582 is 205 million light years away, in fair agreement with a redshift-independent distance estimate of 230 million light years. Given that and its apparent size of 1.2 by 1.2 arcmin, it is about 70 thousand light years across.
SDSS image of region near spiral galaxy NGC 2582
Above, a 12 arcmin wide SDSS image centered on NGC 2582
Below, a 2.4 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy NGC 2582

NGC 2583 (= PGC 23516)
Discovered (1886) by
Frank Muller
A magnitude 13.4 elliptical galaxy (type E0) in Hydra (RA 08 23 07.9, Dec -05 00 08)
Historical Identification: Per Dreyer, NGC 2583 (Muller list II (#402), 1860 RA 08 17 07, NPD 94 31.3) is "very faint, small, round, suddenly brighter middle and nucleus, 1st of 4", the others being NGC 2584, 2585 and 2586.
Physical Information: Apparent size 0.9 by 0.9 arcmin
SDSS image of region near elliptical galaxy NGC 2583, also showing NGC 2584 and NGC 2585
Above, a 12 arcmin wide SDSS image centered on NGC 2583, also showing NGC 2584, 2585 and 2586
Below, a 2.4 arcmin wide SDSS image of the galaxy
SDSS image of elliptical galaxy NGC 2583

NGC 2584 (= PGC 23523)
Discovered (1886) by
Frank Muller
A magnitude 13.8 spiral galaxy (type Sbc) in Hydra (RA 08 23 15.5, Dec -04 58 14)
Historical Identification: Per Dreyer, NGC 2584 (Muller list II (#403), 1860 RA 08 17 19, NPD 94 30.3) is "very faint, small, round, 2nd of 4", the others being NGC 2583, 2585 and 2586.
Physical Information: Apparent size 1.2 by 0.6 arcmin
SDSS image of region near spiral galaxy NGC 2584, also showing NGC 2583 and NGC 2585
Above, a 12 arcmin wide SDSS image centered on NGC 2584, also showing NGC 2583, 2585 and 2586
Below, a 2.4 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy NGC 2584

NGC 2585 (= PGC 23537)
Discovered (1886) by
Frank Muller
A magnitude 13.6 spiral galaxy (type SB(s)b pec) in Hydra (RA 08 23 26.2, Dec -04 54 54)
Historical Identification: Per Dreyer, NGC 2585 (Muller list II (#404), 1860 RA 08 17 25, NPD 94 27.3) is "very faint, small, round, 3rd of 4", the others being NGC 2583, 2584 and 2586.
Physical Information: Apparent size 1.8 by 0.8 arcmin
SDSS image of region near spiral galaxy NGC 2585, also showing NGC 2583 and NGC 2584
Above, a 12 arcmin wide SDSS image centered on NGC 2585, also showing NGC 2583, 2584 and 2586
Below, a 2.4 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy NGC 2585

NGC 2586
Recorded (1886) by
Frank Muller
Three stars in Hydra (RA 08 23 31.6, Dec -04 57 08)
Historical Identification: Per Dreyer, NGC 2586 (Muller list II (#405), 1860 RA 08 17 31, NPD 94 29.3) is "extremely faint, pretty small, round, 4th of 4 (nebulous?)", the others being NGC 2583, 2584 and 2585. (Note: PGC 23603 is often misidentified as NGC 2586, so it is listed immediately below as a warning about the error.)
Physical Information:
SDSS image of region near the three stars listed as NGC 2586, also showing NGC 2583, NGC 2584 and NGC 2585
Above, a 12 arcmin wide SDSS image centered on NGC 2586, also showing NGC 2583, 2584 and 2585

PGC 23603 (not =
NGC 2586)
Not an NGC object but listed here since often misidentified as NGC 2586
A magnitude 15(?) spiral galaxy (type SAB(rs)b?) in Hydra (RA 08 24 32.5, Dec -04 53 17)
Historical Misidentification: To be discussed in detail in the next iteration of this page; misidentified as NGC 2586 in RC3, and therefore often listed as such despite that certainly being an error.
Physical Information:
SDSS image of region near spiral galaxy PGC 23603, which is often misidentified as NGC 2586
Above, a 12 arcmin wide SDSS image centered on PGC 23603, which is not NGC 2586
Below, a 2 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy PGC 23603, which is often misidentified as NGC 2586

NGC 2587 (= OCL 706)
Discovered (Jan 22, 1835) by
John Herschel
A magnitude 9.2 open cluster (type II1p) in Puppis (RA 08 23 26.0, Dec -29 29 54)
Historical Identification: Per Dreyer, NGC 2587 (= GC 1658 = JH 3124, 1860 RA 08 17 39, NPD 119 02.5) is "a cluster, pretty much compressed middle, irregular figure, stars from 9th to 13th magnitude".
Physical Information: Apparent size 10 arcmin
DSS image of region near open cluster NGC 2587
Above, a 12 arcmin wide DSS image centered on NGC 2587

NGC 2588 (= OCL 715)
Discovered (Feb 16, 1836) by
John Herschel
A magnitude 11.8 open cluster (type II1p) in Puppis (RA 08 23 09.0, Dec -32 58 30)
Historical Identification: Per Dreyer, NGC 2588 (= GC 1659 = JH 3125, 1860 RA 08 17 39, NPD 122 31.2) is "a cluster, faint, small, round, gradually brighter middle, stars of 15th magnitude".
Physical Information: Apparent size 2.0 arcmin
DSS image of region near open cluster NGC 2588
Above, a 12 arcmin wide DSS image centered on NGC 2588

NGC 2589
Discovered (Feb 13, 1887) by
Lewis Swift
A lost or nonexistent object in Hydra (RA 08 24 29.4, Dec -08 46 04)
Historical Identification: Per Dreyer, NGC 2589 (Swift list VI (#32), 1860 RA 08 17 42, NPD 98 19.0) is "pretty faint, pretty small, a little extended". The second IC adds "Not found on 3 nights by Howe".
Physical Information:
Image of supposed position to be posted after historical identification is taken care of

NGC 2590 (= PGC 23616 =
IC 507)
Discovered (Feb 26, 1878) by Édouard Stephan (and later listed as NGC 2590)
Discovered (Feb 3, 1888) by Lewis Swift (and later listed as IC 507)
A magnitude 13.1 spiral galaxy (type SA(s)bc?) in Hydra (RA 08 25 01.9, Dec -00 35 30)
Historical Identification: Per Dreyer, NGC 2590 (Stephan list IX (#15), 1860 RA 08 17 53, NPD 90 08.4) is "a faint star involved in very faint, very small, little extended nebula". (See IC 507 for a discussion of the duplicate listing. Corwin lists the equality with two question marks, indicating that he thinks it merely a possibility, and perhaps a remote one at that.)
Physical Information: Apparent size 2.2 by 0.7 arcmin?
SDSS image of spiral galaxy NGC 2590
Above, a 12 arcmin wide SDSS image of NGC 2590

NGC 2591 (= PGC 24231)
Discovered (Aug 12, 1866) by
Heinrich d'Arrest
A magnitude 12.2 spiral galaxy (type Sc) in Camelopardalis (RA 08 37 25.5, Dec +78 01 35)
Historical Identification: Per Dreyer, NGC 2591 (= GC 5418, d'Arrest, 1860 RA 08 18 16, NPD 11 30.3) is "faint, small, extended, a little brighter middle".
Physical Information: Apparent size 3.0 by 0.6 arcmin
DSS image of region near spiral galaxy NGC 2591
Above, a 12 arcmin wide DSS image centered on NGC 2591
Below, a 3 arcmin wide DSS image of the galaxy
DSS image of spiral galaxy NGC 2591
Below, a 3 arcmin wide PanSTARRS image of the galaxy
PanSTARRS image of spiral galaxy NGC 2591

NGC 2592 (= PGC 23701)
Discovered (Mar 11, 1785) by
William Herschel
Also observed (Feb 19, 1827) by John Herschel
A magnitude 12.3 elliptical galaxy (type E2) in Cancer (RA 08 27 08.1, Dec +25 58 13)
Historical Identification: Per Dreyer, NGC 2592 (= GC 1660 = JH 505 = WH II 315, 1860 RA 08 18 43, NPD 63 34.5) is "pretty faint, small, round, very suddenly brighter middle similar to a star".
Physical Information: Apparent size 1.7 by 1.4 arcmin
SDSS image of region near elliptical galaxy NGC 2592, also showing NGC 2594
Above, a 12 arcmin wide SDSS image centered on NGC 2592, also showing NGC 2594

NGC 2593 (= PGC 23692)
Discovered (Jan 26, 1865) by
Albert Marth
A magnitude 13.9 lenticular galaxy (type SB0(rs)a?) in Cancer (RA 08 26 47.8, Dec +17 22 30)
Historical Identification: Per Dreyer, NGC 2593 (= GC 5419, Marth #119, 1860 RA 08 18 49, NPD 72 10) is "extremely faint, very small".
Physical Information: Apparent size 0.9 by 0.5 arcmin
SDSS image of region near lenticular galaxy NGC 2593
Above, a 12 arcmin wide SDSS image centered on NGC 2593

NGC 2594 (= PGC 23704)
Discovered (Mar 29, 1865) by
Albert Marth
A magnitude 14.1 lenticular galaxy (type S0) in Cancer (RA 08 27 17.2, Dec +25 52 44)
Historical Identification: Per Dreyer, NGC 2594 (= GC 5420, Marth #120, 1860 RA 08 18 52, NPD 63 40) is "extremely faint".
Physical Information: Apparent size 0.8 by 0.5 arcmin
SDSS image of region near lenticular galaxy NGC 2594, also showing NGC 2592
Above, a 12 arcmin wide SDSS image centered on NGC 2594, also showing NGC 2592

NGC 2595 (= PGC 23725)
Discovered (Jan 11, 1787) by
William Herschel
Also observed (Feb 24, 1827) by John Herschel
A magnitude 12.3 spiral galaxy (type SBc? pec) in Cancer (RA 08 27 42.0, Dec +21 28 45)
Historical Identification: Per Dreyer, NGC 2595 (= GC 1661 = JH 506 = WH III 599, 1860 RA 08 19 34, NPD 68 03.8) is "very faint, pretty large, irregular figure, mottled but not resolved, double star 2 arcmin to southwest".
Physical Information: Apparent size 3.2 by 2.4 arcmin
SDSS image of region near spiral galaxy NGC 2595
Above, a 12 arcmin wide SDSS image centered on NGC 2595

NGC 2596 (= PGC 23714)
Discovered (Jan 26, 1865) by
Albert Marth
A magnitude 13.5 spiral galaxy (type Sb) in Cancer (RA 08 27 26.5, Dec +17 17 03)
Historical Identification: Per Dreyer, NGC 2596 (= GC 5421, Marth #121, 1860 RA 08 19 37, NPD 72 15) is "very faint, small, a little extended".
Physical Information: Apparent size 1.5 by 0.6 arcmin
SDSS image of region near spiral galaxy NGC 2596
Above, a 12 arcmin SDSS image centered on NGC 2596

NGC 2597
Discovered (Jan 1, 1864) by
Albert Marth
A pair of stars in Cancer (RA 08 29 57.8, Dec +21 30 05)
Historical Identification: Per Dreyer, NGC 2597 (= GC 5422, Marth #122, 1860 RA 08 21 49, NPD 68 02) is "extremely faint, very small".
Physical Information:
SDSS image of region near the pair of stars listed as NGC 2597, also showing NGC 2598
Above, a 12 arcmin SDSS image centered on NGC 2597, also showing NGC 2598

NGC 2598 (= PGC 23855)
Discovered (Jan 1, 1864) by
Albert Marth
A magnitude 13.6 spiral galaxy (type SBa) in Cancer (RA 08 30 02.5, Dec +21 29 19)
Historical Identification: Per Dreyer, NGC 2598 (= GC 5423, Marth #123, 1860 RA 08 21 54, NPD 68 02) is "faint, small".
Physical Information: Apparent size 1.3 by 0.6 arcmin
SDSS image of region near spiral galaxy NGC 2598, also showing the pair of stars listed as NGC 2597
Above, a 12 arcmin SDSS image centered on NGC 2598, also showing NGC 2597

NGC 2599 (= PGC 23941)
Discovered (Nov 16, 1784) by
William Herschel
Also observed (Feb 24, 1827) by John Herschel
A magnitude 12.2 spiral galaxy (type SAa) in Cancer (RA 08 32 11.3, Dec +22 33 38)
Historical Identification: Per Dreyer, NGC 2599 (= GC 1662 = JH 507 = WH III 234, 1860 RA 08 23 58, NPD 66 58.2) is "very faint, small, stellar".
Physical Information: Based on a recessional velocity of 4740 km/sec, NGC 2599 is about 220 million light years away. Given that and its apparent size of 2.8 by 2.5 arcmin, it is about 180 thousand light years across.
SDSS image of region near spiral galaxy NGC 2599
Above, a 12 arcmin wide SDSS image centered on NGC 2599
Below, a 3 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy NGC 2599
Celestial Atlas
(NGC 2500 - 2549) ←NGC Objects: NGC 2550 - 2599→ (NGC 2600 - 2649)