Celestial Atlas
(NGC 500 - 549) ←     NGC Objects: NGC 550 - 599     → (NGC 600 - 649)
Click here for Introductory Material
QuickLinks:
550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566,
567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583,
584, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598, 599

Page last updated Aug 5, 2012
WORKING: Add basic pix, tags

NGC 550 (= PGC 5374)
Discovered (Oct 8, 1785) by
William Herschel
A 13th-magnitude spiral galaxy (type SB(s)a?) in Cetus (RA 01 26 42.4, Dec +02 01 20)
Apparent size 1.4 by 0.6 arcmin.
SDSS image of spiral galaxy NGC 550
Above, a 2.4 arcmin wide closeup of NGC 550
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 550

NGC 551 (= PGC 5450)
Discovered (Sep 21, 1786) by
William Herschel
A 13th-magnitude spiral galaxy (type SBbc) in Andromeda (RA 01 27 40.6, Dec +37 10 59)
Apparent size 1.8 by 0.8 arcmin.
SDSS image of spiral galaxy NGC 551
Above, a 2.4 arcmin wide closeup of NGC 551
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 551 overlaid on a DSS background to fill in missing areas

NGC 552
Recorded (Sep 13, 1784) by
William Herschel
A 15th-magnitude star in Pisces (RA 01 26 10.0, Dec +33 24 23)
Per Dreyer, NGC 552 (= GC 328, 1860 RA 01 19 56, NPD 57 16.1) is "very small, stellar, the preceding of 2", with NGC 553 as the other, and "? RA", indicating that the right ascension is very uncertain. There must have been something wrong with the way that Herschel's clock was running on the evening in question, as most of the objects he observed that night are nowhere near his reduced right ascensions. Corwin's analysis (to be covered in the next iteration of this page) suggests that NGC 552 is the star listed above; but the identification, though reasonable, cannot be considered certain.

NGC 553 (= PGC 5333)
Discovered (Sep 13, 1784) by
William Herschel
A 14th-magnitude lenticular galaxy (type S0) in Pisces (RA 01 26 12.5, Dec +33 24 17)
Per Dreyer, NGC 553 (= GC 329, 1860 RA 01 19 56, NPD 57 16.1) is "very small, stellar, the following of 2", with NGC 552 as the other, and "? RA", indicating that the right ascension is very uncertain. Apparent size 0.6 by 0.3 arcmin. There must have been something wrong with the way that Herschel's clock was running on the evening in question, as most of the objects he observed that night are nowhere near his reduced right ascensions. Corwin's analysis (to be covered in the next iteration of this page) suggests that NGC 552 is the galaxy listed above; but the identification, though reasonable, cannot be considered certain.

NGC 554 (= PGC 5412 + PGC 5413)
Discovered (1886) by
Frank Muller (II-305)
A pair of galaxies in Cetus
PGC 5412 = A 14th-magnitude lenticular galaxy (type S0) at RA 01 27 09.6, Dec -22 43 32
PGC 5413 = A 14th-magnitude lenticular galaxy (type SB0) at RA 01 27 09.5, Dec -22 43 25
Per Dreyer, NGC 554 (= Muller list II (#305), 1860 RA 01 20 04, NPD 113 27.4) is "extremely faint, very small, extended, the 1st of 3 (the others being NGC 555 and NGC 556), with an 11th-magnitude star following (that is, to the east)". The second Index Catalog lists a corrected RA (per Howe) of 01 20 28. The object is a pair of galaxies far too close to each other to have been in any way distinguishable from each other even with much better equipment than available at the time, hence the double PGC listing. Apparent size for PGC 5412 is 0.9 by 0.5 arcmin; for PGC 5413 it is 0.3 by 0.3 arcmin.
DSS image of the pair of lenticular galaxies listed as NGC 554, showing a faint extension perhaps due to a physical interaction
Above, a 2.4 arcmin wide closeup of NGC 554
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 555 and 556
DSS image of the pair of lenticular galaxies listed as NGC 554, showing a faint extension perhaps due to a physical interaction; also shown are lenticular galaxies NGC 555 and NGC 556

NGC 555 (= PGC 5419)
Discovered (1886) by
Frank Muller (II-306)
A 14th-magnitude lenticular galaxy (type SB0/a) in Cetus (RA 01 27 11.7, Dec -22 45 42)
The second Index Catalog lists a corrected RA (per Howe) of 01 20 30. Apparent size 0.7 by 0.6 arcmin.

NGC 556 (= PGC 5420)
Discovered (1886) by
Frank Muller (II-307)
A 15th-magnitude lenticular galaxy (type E/S0) in Cetus (RA 01 27 12.5, Dec -22 41 50)
The second Index Catalog lists a corrected RA (per Howe) of 01 20 31. Apparent size 0.4 by 0.3 arcmin.

NGC 557 (=
IC 1703 = PGC 5351)
Discovered (Nov 20, 1886) by Lewis Swift (6-11) (and later listed as NGC 557)
Discovered (Oct 27, 1897) by Guillaume Bigourdan (and later listed as IC 1703)
A 14th-magnitude lenticular galaxy (type SB0/a) in Cetus (RA 01 26 25.1, Dec -01 38 18)
Apparent size 1.8 by 0.6 arcmin.

NGC 558 (= PGC 5425)
Discovered (Feb 1, 1864) by
Wilhelm d'Arrest
A 14th-magnitude elliptical galaxy (type E5+?) in Cetus (RA 01 27 16.1, Dec -01 58 14)
Per Dreyer, NGC 558 (= GC 5180, d'Arrest, 1860 RA 01 20 07, NPD 92 41.9), is "extremely faint, small, extended, 10th-magnitude star to west". The position precesses to within 0.4 arcmin of the correct position, and there is a star just off to the west (although only 11.5 magnitude), so the identification is certain. Listed as part of Abell 194. Based on a recessional velocity of 4955 km/sec, NGC 558 is about 230 million light years away. Given that and its apparent size of 0.4 by 0.2 arcmin, it is about 25 thousand light years across. The galaxy seems to be universally classified as an elliptical, but its very elongated shape is more like that of a lenticular galaxy, so E/S0 might be a more accurate classification, and is the reason for listing it as E5+? instead of merely E5.
SDSS image of elliptical galaxy NGC 558
Above, a 2.4 arcmin wide closeup of NGC 558
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 560
SDSS image of region near elliptical galaxy NGC 558, also showing lenticular galaxy NGC 560

NGC 559 (= OCL 322)
Discovered (Nov 9, 1787) by
William Herschel
A 10th-magnitude open cluster (type II2m) in Cassiopeia (RA 01 29 31.0, Dec +63 18 06)
Apparent size 7.0 arcmin.

NGC 560 (= PGC 5430)
Discovered (Oct 1, 1785) by
William Herschel
A 13th-magnitude lenticular galaxy (type S0) in Cetus (RA 01 27 25.3, Dec -01 54 45)
Per Dreyer, NGC 560 (= GC 332, 1860 RA 01 20 19, NPD 92 38.8), is "very faint, very small, irregularly extended, western of 2" (the other, or "eastern of 2", being NGC 564). The position precesses to within 0.5 arcmin of the correct position, so the identification is certain (and would be nailed down by the relative positions of NGC 560 and 564 even if the position were slightly in error). Listed as part of Abell 194. Based on a recessional velocity of 5510 km/sec, NGC 560 is about 255 million light years away. Given that and its apparent size of 2.0 by 0.5 arcmin, it is about 150 thousand light years across.
SDSS image of lenticular galaxy NGC 560
Above, a 2.4 arcmin wide closeup of NGC 560
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 558 and 564
SDSS image of region near lenticular galaxy NGC 560, also showing elliptical galaxies NGC 558 and NGC 564

NGC 561 (= PC 5489)
Discovered (Aug 23, 1862) by
Wilhelm d'Arrest
A 13th-magnitude spiral galaxy (type (R)SB(s)a) in Andromeda (RA 01 28 18.7, Dec +34 18 30)
Apparent size 1.6 by 1.5 arcmin.
SDSS image of spiral galaxy NGC 561
Above, a 2.4 arcmin wide closeup of NGC 561
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 561

NGC 562 (= PGC 5502)
Discovered (Nov 30, 1885) by
Lewis Swift (3-5)
A 13th-magnitude spiral galaxy (type SA(rs)c) in Andromeda (RA 01 28 29.3, Dec +48 23 13)
Apparent size 1.3 by 1.1 arcmin.
SDSS image of spiral galaxy NGC 562
Above, a 2.4 arcmin wide closeup of NGC 562
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 562

NGC 563 (=
NGC 539 = PGC 5269)
Discovered (Oct 31, 1885) by Francis Leavenworth (and later listed as NGC 539)
Discovered (1886) by Francis Leavenworth (I-30) (and later listed as NGC 563)
A 14th-magnitude spiral galaxy (type SB(rs)c) in Cetus (RA 01 25 21.7, Dec -18 09 52)
(this entry will contain mostly historical information; for anything else see NGC 539)

NGC 564 (= PGC 5455)
Discovered (Oct 1, 1785) by
William Herschel
A 13th-magnitude elliptical galaxy (type E2?) in Cetus (RA 01 27 48.2, Dec -01 52 43)
Per Dreyer, NGC 564 (= GC 333, 1860 RA 01 20 40, NPD 92 36.9) is "very faint, very small, irregular figure, eastern of 2". (The other, or "western of 2", being NGC 560.) The position precesses to within 0.5 arcmin of the correct position, so the identification is certain (and would be nailed down by the relative positions of NGC 560 and 564 even if the positions were slightly in error). Listed as part of Abell 194. Based on a recessional velocity of 5835 km/sec, NGC 564 is about 270 million light years away, in relatively poor agreement with redshift-independent distance estimates of about 200 million light years. Given that and its apparent size of 1.4 by 1.2 arcmin, it is about 110 thousand light years across.
SDSS image of elliptical galaxy NGC 564
Above, a 2.4 arcmin wide closeup of NGC 564
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 560
SDSS image of elliptical galaxy NGC 564, also showing lenticular galaxy NGC 560

NGC 565 (= PGC 5481)
Discovered (Nov 2, 1867) by
George Searle (26, HN 34)
A 14th-magnitude spiral galaxy (type Sa) in Cetus (RA 01 28 10.0, Dec -01 18 21)
Apparent size 1.3 by 0.4 arcmin.
SDSS image of spiral galaxy NGC 565
Above, a 2.4 arcmin wide closeup of NGC 565
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 565

NGC 566 (= PGC 5545)
Discovered (Nov 22, 1827) by
John Herschel
A 14th-magnitude lenticular galaxy (type S0) in Pisces (RA 01 29 02.9, Dec +32 19 56)
Apparent size 1.6 by 0.4 arcmin.

NGC 567 (= PGC 5402)
Discovered (1886) by
Francis Leavenworth (I-31)
A 14th-magnitude lenticular galaxy (type S0) in Pisces (RA 01 27 02.3, Dec -10 15 53)
Apparent size 1.0 by 0.6 arcmin.

NGC 568 (=
IC 1709 = PGC 5468)
Discovered (Nov 29, 1837) by John Herschel (and later listed as NGC 568)
Discovered (Sep 4, 1897) by Lewis Swift (and later listed as IC 1709)
A 13th-magnitude lenticular galaxy (type E/S0) in Sculptor (RA 01 27 56.9, Dec -35 43 03)
Apparent size 2.2 by 1.3 arcmin.

NGC 569 (= PGC 5548)
Discovered (Oct 1, 1864) by
Albert Marth (#49)
A 14th-magnitude spiral galaxy (type Sbc) in Pisces (RA 01 29 07.1, Dec +11 07 54)
Apparent size 1.0 by 0.5 arcmin. Recessional velocity 5795 km/sec. A probable companion of PGC 5555.
SDSS image of spiral galaxy NGC 569 and spiral galaxy PGC 5555
Above, a 2.4 arcmin wide closeup of NGC 569 and PGC 5555
Below, a 12 arcmin wide region centered on NGC 569
SDSS image of region near spiral galaxy NGC 569 and spiral galaxy PGC 5555

PGC 5555
Not an NGC object but listed here because a probable companion of
NGC 569
A 15th-magnitude spiral galaxy (type SAB(s)bc) in Pisces (RA 01 29 11.1, Dec +11 08 26)
Apparent size 1.2 by 0.7 arcmin. Recessional velocity 5780 km/sec. A probable companion of NGC 569, which see for images.

NGC 570 (= PGC 5539)
Discovered (Oct 31, 1867) by
George Searle (27, HN 32)
A 13th-magnitude spiral galaxy (type (R')SB(rs)a) in Cetus (RA 01 28 58.5, Dec -00 56 55)
Apparent size 1.6 by 1.3 arcmin.
SDSS image of spiral galaxy NGC 570
Above, a 2.4 arcmin wide closeup of NGC 570
Below, a 12 arcmin wide region centered on NGC 570
SDSS image of region near spiral galaxy NGC 570

NGC 571 (= PGC 5587)
Discovered (Oct 1, 1864) by
Wilhelm d'Arrest
A 14th-magnitude spiral galaxy (type Sbc) in Pisces (RA 01 29 56.1, Dec +32 30 03)
Apparent size 1.3 by 1.3 arcmin.
SDSS image of spiral galaxy NGC 571
Above, a 2.4 arcmin wide closeup of NGC 571
Below, a 12 arcmin wide region centered on NGC 571
SDSS image of region near spiral galaxy NGC 571

NGC 572 (= PGC 5508)
Discovered (Sep 4, 1834) by
John Herschel
A 14th-magnitude lenticular galaxy (type SB0) in Sculptor (RA 01 28 36.4, Dec -39 18 26)
Apparent size 0.8 by 0.7 arcmin.

NGC 573 (= PGC 5638)
Discovered (Oct 21, 1881) by
Édouard Stephan (12-15)
A 13th-magnitude spiral galaxy (type S?) in Andromeda (RA 01 30 49.3, Dec +41 15 26)
Apparent size 0.4 by 0.4 arcmin.
SDSS image of spiral galaxy NGC 573
Above, a 2.4 arcmin wide closeup of NGC 573
Below, a 12 arcmin wide region centered on NGC 573
SDSS image of region near spiral galaxy NGC 573

NGC 574 (= PGC 5544)
Discovered (Sep 1, 1834) by
John Herschel
A 13th-magnitude spiral galaxy (type (R')SB(rs)b) in Sculptor (RA 01 29 03.1, Dec -35 35 55)
Apparent size 1.1 by 0.7 arcmin.
DSS image of spiral galaxy NGC 574
Above, a 2.4 arcmin wide closeup of NGC 574
Below, a 12 arcmin wide region centered on NGC 574
DSS image of region near spiral galaxy NGC 574

NGC 575 (=
IC 1710 = PGC 5634)
Discovered (Oct 17, 1876) by Édouard Stephan (8-5) (and later listed as NGC 575)
Discovered (Jan 18, 1896) by Stephane Javelle (and later listed as IC 1710)
A 13th-magnitude spiral galaxy (type SB(rs)c) in Pisces (RA 01 30 46.4, Dec +21 26 25)
Apparent size 1.7 by 1.6 arcmin.
SDSS image of spiral galaxy NGC 575
Above, a 2.4 arcmin wide closeup of NGC 575
Below, a 12 arcmin wide region centered on NGC 575
SDSS image of region near spiral galaxy NGC 575

NGC 576 (= PGC 5535)
Discovered (Oct 3, 1834) by
John Herschel
A 13th-magnitude lenticular galaxy (type SB0/a) in Phoenix (RA 01 28 57.4, Dec -51 35 53)
Apparent size 1.0 by 0.8 arcmin.

NGC 577 (=
NGC 580 = PGC 5628)
Discovered (Oct 23, 1867) by Aaron Skinner (#100) (and later listed as NGC 577)
Discovered (Aug 14, 1877) by Wilhelm Tempel (and later listed as NGC 580)
A 13th-magnitude spiral galaxy (type (R)SB(r)a pec) in Cetus (RA 01 30 40.6, Dec -01 59 39)
Per Dreyer, NGC 577 (= Tempel I (#8), II, 1860 RA 01 23 34, NPD 92 43.1) is "faint". Skinner discovered the object in 1867, but his observation was not published until 1886, and even then only in a footnote to another paper, so Dreyer had little chance to note its existence prior to the publication of the NGC, and Tempel's "rediscovery" was an independent observation (although as will noted in the discussion of the double listing at NGC 580, muddled by an apparently fatal error in another "observation" of the same night). In any event, the position precesses to exactly the correct position, so the current identification is certain. Listed as possible member of Abell 194. Based on a recessional velocity of 5935 km/sec, NGC 577 is about 275 million light years away. Given that and its apparent size of 1.9 by 1.4 arcmin, it is about 150 thousand light years across.
SDSS image of spiral galaxy NGC 577
Above, a 2.4 arcmin wide closeup of NGC 577
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 577

NGC 578 (= PGC 5619)
Discovered (Nov 11, 1835) by
John Herschel
An 11th-magnitude spiral galaxy (type SAB(rs)c) in Cetus (RA 01 30 28.9, Dec -22 40 00)
Apparent size 4.8 by 3.0 arcmin.
NOAO image of spiral galaxy NGC 578
Above, a 5 arcmin wide closeup of NGC 578 (Credits above and below: Adam Block/NOAO/AURA/NSF)
Below, a 12 arcmin wide region centered on the galaxy
NOAO image of region near spiral galaxy NGC 578 superimposed on a DSS background to fill in missing areas

NGC 579 (= PGC 5691)
Discovered (Nov 22, 1827) by
John Herschel
A 13th-magnitude spiral galaxy (type Scd) in Triangulum (RA 01 31 46.7, Dec +33 36 52)
Apparent size 1.5 by 1.3 arcmin.
SDSS image of spiral galaxy NGC 579
Above, a 2.4 arcmin wide closeup of NGC 579
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 579

NGC 580 (=
NGC 577 = PGC 5628)
Discovered (Oct 23, 1867) by Aaron Skinner (and later listed as NGC 577)
Discovered (Aug 14, 1877) by Wilhelm Tempel (I-8) (and later listed as NGC 580)
A 13th-magnitude spiral galaxy (type (R)SB(r)a pec) in Cetus (RA 01 30 40.6, Dec -01 59 39)
The second Index Catalog lists a corrected RA (per Howe) of 01 23 34. A discussion of the double listing to be added when time permits. For now, refer to Corwin.

NGC 581 (= OCL 326 =
M103)
Discovered (April 1781) by Pierre Méchain
Recorded (date?) by Charles Messier as M103
A 7th-magnitude open cluster (type III2p) in Cassiopeia (RA 01 33 23.0, Dec +60 39 30)
Apparent size 6.0 arcmin.
NOAO image of open cluster NGC 581, also known as M103
Above, a closeup NGC 581 (Image Credit: Hillary Mathis & N. A. Sharp, KPNO 2.1-m Tel., AURA, NSF, NOAO)

NGC 582 (= PGC 5702)
Discovered (Aug 9, 1863) by
Wilhelm d'Arrest
A 13th-magnitude spiral galaxy (type SBb) in Triangulum (RA 01 31 58.2, Dec +33 28 32)
Apparent size 2.2 by 0.6 arcmin.
SDSS image of spiral galaxy NGC 582
Above, a 2.4 arcmin wide closeup of NGC 582
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 582

NGC 583 (= PGC 5576)
Discovered (1886) by
Francis Leavenworth (II-308)
A 14th-magnitude lenticular galaxy (type SB0) in Cetus (RA 01 29 44.1, Dec -18 20 22)
The second Index Catalog lists a corrected RA (per Howe) of 01 22 57. Apparent size 0.7 by 0.6 arcmin.

NGC 584 (=
IC 1712 = PGC 5663)
Discovered (Sep 10, 1785) by William Herschel (and later listed as NGC 584)
Discovered (Nov 30, 1885) by Lewis Swift (and later listed as IC 1712)
An 11th-magnitude elliptical galaxy (NED type E4) in Cetus (RA 01 31 20.5, Dec -06 52 02)
The second Index Catalog lists a corrected RA (per Howe) of 01 22 57. Apparent size 4.1 by 2.0 arcmin. Used by the de Vaucouleurs Atlas of Galaxy Types as an example of galaxy type SA0-.
SDSS image of elliptical galaxy NGC 584
Above, a 4 arcmin wide closeup of NGC 584
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 586
SDSS image of region near elliptical galaxy NGC 584, also showing spiral galaxy NGC 586

NGC 585 (= PGC 5688)
Discovered (Dec 20, 1827) by
John Herschel
A 13th-magnitude spiral galaxy (type Sa) in Cetus (RA 01 31 42.2, Dec -00 55 58)
Apparent size 2.4 by 0.5 arcmin.
SDSS image of spiral galaxy NGC 585
Above, a 2.4 arcmin wide closeup of NGC 585
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 585

NGC 586 (= PGC 5679)
Discovered (Sep 10, 1785) by
William Herschel
A 13th-magnitude spiral galaxy (type SA(s)a?) in Cetus (RA 01 31 36.8, Dec -06 53 35)
Apparent size 1.7 by 0.9 arcmin.
SDSS image of spiral galaxy NGC 586
Above, a 2.4 arcmin wide closeup of NGC 586
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 584
SDSS image of region near spiral galaxy NGC 586, also showing elliptical galaxy NGC 584

NGC 587 (= PGC 5746)
Discovered (Aug 27, 1862) by
Wilhelm d'Arrest
A 13th-magnitude spiral galaxy (type SAB(s)b) in Triangulum (RA 01 32 33.3, Dec +35 21 30)
Apparent size 2.2 by 0.8 arcmin.
DSS image of spiral galaxy NGC 587
Above, a 2.4 arcmin wide closeup of NGC 587
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 587

NGC 588, in the Triangulum Galaxy,
M33
Discovered (Oct 2, 1861) by Wilhelm d'Arrest
A 14th-magnitude star cluster and emission nebula in Triangulum (RA 01 32 45.7, Dec +30 38 56)
Apparent size 0.65 arcmin.
DSS image of the star cluster and emission nebula listed as NGC588, in the Triangulum Galaxy, M33
Above, a 2.4 arcmin wide closeup of NGC 588
Below, a 12 arcmin wide region centered on NGC 588, also showing NGC 592
Also see the finding chart for NGC/IC objects in the Triangulum Galaxy, M33
DSS image of region near the star cluster and emission nebula listed as NGC588, in the Triangulum Galaxy, M33; also shown is star cluster and emission nebula NGC 592

NGC 589 (= PGC 5758)
Discovered (1886) by
Frank Muller (II-309)
A 14th-magnitude lenticular galaxy (type S0/a) in Cetus (RA 01 32 39.9, Dec -12 02 32)
The second Index Catalog lists a corrected RA (per Howe) of 01 25 46. Apparent size 1.1 by 0.9 arcmin.

NGC 590 (= PGC 5808)
Discovered (Sep 22, 1865) by
Wilhelm d'Arrest
A 13th-magnitude lenticular galaxy (type SB0/a) in Andromeda (RA 01 33 40.7, Dec +44 55 45)
Apparent size 2.6 by 1.3 arcmin.

NGC 591 (= PGC 5800)
Discovered (Oct 10, 1866) by
Truman Safford (Safford 61)
A 13th-magnitude lenticular galaxy (type SB0/a) in Andromeda (RA 01 33 31.1, Dec +35 40 06)
Apparent size 1.3 by 1.0 arcmin.

NGC 592, in the Triangulum Galaxy,
M33
Discovered (Oct 2, 1861) by Wilhelm d'Arrest
A 13th-magnitude star cluster and emission nebula in Triangulum (RA 01 33 12.0, Dec +30 38 47)
Apparent size 0.70 arcmin. (for now, see the wide-field image for NGC 588 and the finding chart for M33)

NGC 593 (= PGC 5733 = PGC 954102)
Discovered (Nov 2, 1882) by
Édouard Stephan (12-17)
A 15th-magnitude lenticular galaxy (type SB0^0(r)?) in Cetus (RA 01 32 20.6, Dec -12 21 16)
Apparent size 1.2 by 0.2 arcmin. (A Wikisky search for NGC 593 shows the correct object, but labeled as PGC 954102.)

NGC 594 (= PGC 5769)
Discovered (1886) by
Francis Leavenworth (I-32)
A 14th-magnitude spiral galaxy (type Sbc) in Cetus (RA 01 32 57.0, Dec -16 32 07)
Apparent size 1.4 by 0.6 arcmin.
DSS image of spiral galaxy NGC 594
Above, a 2.4 arcmin wide closeup of NGC 594
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 594

NGC 595, in the Triangulum Galaxy,
M33
Discovered (Oct 1, 1864) by Wilhelm d'Arrest
A 15th-magnitude emission nebula in Triangulum (RA 01 33 34.0, Dec +30 41 32)
Apparent size 0.50 arcmin. (for now, see the finding chart for M33)

NGC 596 (= PGC 5766)
Discovered (Dec 13, 1783) by
William Herschel
An 11th-magnitude elliptical galaxy (type E4) in Cetus (RA 01 32 52.0, Dec -07 01 55)
Apparent size 3.2 by 2.0 arcmin.

NGC 597 (= PGC 5721)
Discovered (Sep 25, 1834) by
John Herschel
A 13th-magnitude spiral galaxy (type SB(s)bc?) in Sculptor (RA 01 32 14.9, Dec -33 29 49)
Apparent size 1.4 by 1.3 arcmin.
DSS image of spiral galaxy NGC 597
Above, a 2.4 arcmin wide closeup of NGC 597
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 597

NGC 598 (= PGC 5818 =
M33), the Triangulum Galaxy
Recorded (before 1654) by Giovanni Hodierna
Recorded (August 25, 1764) by Charles Messier
A 6th-magnitude spiral galaxy (type SA(s)cd) in Triangulum (RA 01 33 51.9, Dec +30 39 29)
Per Dreyer, NGC 598 (= Messier 33, 1860 RA 01 25 58, NPD 60 03.8) is "a remarkable object, extremely bright, extremely large, round, very gradually much brighter middle and nucleus". The position precesses to RA 01 33 50.1, Dec +30 39 25, right on the nucleus of the galaxy, so the identification is certain. (Note: See the discussion of Hodierna for an explanation of why he was not credited with the discovery of any NGC object.) M33 is a member of the Local Group of Galaxies, and as such its recessional velocity of -180 km/sec represents its random motion relative to our galaxy, and has nothing to do with the Universal expansion; so it cannot be used to estimate the distance of the galaxy. However, dozens of redshift-independent distance estimates indicate that the galaxy is between 2 and 4 million light years away. Given that and its apparent size of 60 by 35 arcmin, it is about 50 thousand light years across.
NOAO image of spiral galaxy NGC 598, also known as the Triangulum Galaxy, M33
Above, a wide-field ground based image (Image credit: Adam Block/AURA/NSF/NOAO)
Below, a closeup of the central fifth of the galaxy (Image credit: Adam Block/AURA/NSF/NOAO)
NOAO closeup of central fifth of spiral galaxy NGC 598, also known as the Triangulum Galaxy, M33
Below, a view of the galaxy showing a region about one degree high and 45 arcmin wide
DSS image of spiral galaxy NGC 598, also known as the Triangulum Galaxy, M33
Below, a 42 by 45 arcmin finding chart for NGC/IC objects in M33
(N### indicates an NGC object, ### an IC object)
Labeled DSS image showing NGC and IC objects in the spiral galaxy NGC 598, also known as the Triangulum Galaxy, M33

NGC 599 (= PGC 5778)
Discovered (Nov 27, 1785) by
William Herschel
A 13th-magnitude lenticular galaxy (type E/S0) in Cetus (RA 01 32 53.7, Dec -12 11 27)
Apparent size 1.4 by 1.3 arcmin.
DSS image of spiral galaxy NGC 599
Above, a 2.4 arcmin wide closeup of NGC 599
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 599
Celestial Atlas
(NGC 500 - 549) ←     NGC Objects: NGC 550 - 599     → (NGC 600 - 649)