Celestial Atlas
(NGC 550 - 599) ←     NGC Objects: NGC 600 - 649     → (NGC 650 - 699)
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600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616,
617, 618, 619, 620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633,
634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649

Page last updated Mar 30, 2014
WORKING: Add basic pix, tags

NGC 600 (= PGC 5777)
Discovered (Sep 10, 1785) by
William Herschel
A 12th-magnitude spiral galaxy (type (R')SB(rs)d) in Cetus (RA 01 33 05.4, Dec -07 18 44)
Apparent size 2.8 by 2.1 arcmin.
SDSS image of spiral galaxy NGC 600
Above, a 3 arcmin wide closeup of NGC 600
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 600

NGC 601 (= PGC 73980)
Discovered (1886) by
Frank Muller (II-311)
A 15th-magnitude compact galaxy (type C) in Cetus (RA 01 33 06.5, Dec -12 12 30)
Apparent size 0.4 by 0.4 arcmin.

NGC 602, in the Small Magellanic Cloud
Discovered (Aug 1, 1826) by
James Dunlop (#17)
An open cluster and emission nebula in Hydrus (RA 01 29 26.4, Dec -73 33 26)
Apparent size 34 arcmin. A 5-million-year old open cluster and surrounding emission nebula in the Small Magellanic Cloud.
HST image of open cluster NGC 602 and part of the surrounding emission nebula
Above, the open cluster and its immediate environs
Below, a wider view (Credits: NASA, ESA/Hubble Collaboration, the Hubble Heritage Team (STScI/AURA))
Wide-field HST view of open cluster NGC 602 and the surrounding emission nebula

NGC 603
Recorded (Nov 16, 1850) by
Bindon Stoney
Three stars in Triangulum (RA 01 34 44.2, Dec +30 13 57)
The second Index Catalog notes "On two plates of Messier 33 by Dr. Roberts I could only see an extremely faint star in this place".

NGC 604, in the Triangulum Galaxy,
M33
Discovered (Sep 11, 1784) by William Herschel
A 12th-magnitude emission region in Triangulum (RA 01 34 32.6, Dec +30 47 04)
Apparent size 1.95 arcmin. (for now, see the finding chart for the Triangulum Galaxy, M33)

NGC 605 (= PGC 5891)
Discovered (Oct 21, 1881) by
Édouard Stephan (12-18)
A 13th-magnitude lenticular galaxy (type S0) in Andromeda (RA 01 35 02.3, Dec +41 14 52)
Apparent size 2.2 by 1.1 arcmin.

NGC 606 (= PGC 5874)
Discovered (Oct 18, 1881) by
Édouard Stephan (12-16)
A 13th-magnitude spiral galaxy (type SB(r)c) in Pisces (RA 01 34 50.3, Dec +21 25 05)
Apparent size 1.4 by 1.2 arcmin.
SDSS image of spiral galaxy NGC 606
Above, a 2.4 arcmin wide closeup of NGC 606
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 606

NGC 607
Recorded (Aug 23, 1855) by
Heinrich d'Arrest
A pair of stars in Cetus (RA 01 34 16.4, Dec -07 24 41)
The first Index Catalog notes "This star is not nebulous, but has a 14th-magnitude star close south, looking at first sight like a nebulous appendage (per Spitaler)".

NGC 608 (= PGC 5913)
Discovered (Nov 22, 1827) by
John Herschel
A 13th-magnitude spiral galaxy (type Sab) in Triangulum (RA 01 35 28.1, Dec +33 39 23)
Apparent size 1.9 by 1.5 arcmin.
SDSS image of spiral galaxy NGC 608
Above, a 2.4 arcmin wide closeup of NGC 608 and its faint, extended disk.
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 614
SDSS image of region near spiral galaxy NGC 608, also showing lenticular galaxy NGC 614

NGC 609 (= OCL 325)
Discovered (Aug 9, 1863) by
Heinrich d'Arrest
An 11th-magnitude open cluster (type II3r) in Cassiopeia (RA 01 36 23.7, Dec +64 32 12)
Apparent size 3.0 arcmin.

NGC 610
Recorded (1886) by
Frank Muller (II-312)
A lost or nonexistent object in Cetus (RA 01 33 33.0, Dec -20 08 38)

NGC 611
Recorded (1886) by
Frank Muller (II-313)
A lost or nonexistent object in Cetus (RA 01 33 33.0, Dec -20 07 38)

NGC 612 (= PGC 5827)
Discovered (Nov 29, 1837) by
John Herschel
A 13th-magnitude lenticular galaxy (type S0/a) in Sculptor (RA 01 33 57.7, Dec -36 29 35)
Apparent size 1.5 by 0.9 arcmin.

NGC 613 (= PGC 5849)
Discovered (Dec 9, 1798) by
William Herschel
A 10th-magnitude spiral galaxy (type SB(rs)bc) in Sculptor (RA 01 34 18.4, Dec -29 25 07)
Apparent size 5.5 by 4.2 arcmin. Possibly a Seyfert galaxy (type Sy ?). Used by de Vaucouleurs as an example of galaxy type SB(rs)bc.
ESO image of spiral galaxy NGC 613
Above, a 6 arcmin wide closeup of NGC 613 (Image Credits above and below: ESO/P.D. Barthel)
Below, a 12 arcmin wide region centered on the galaxy
ESO image of region near spiral galaxy NGC 613, superimposed on a DSS background to fill in missing areas
*note to self: add CTIO/NOAO image in next iteration of this page*

NGC 614 (=
NGC 618 = NGC 627 = PGC 5933)
Discovered (Sep 13, 1784) by William Herschel (and later listed as NGC 614)
Discovered (Nov 11, 1827) by John Herschel (and later listed as NGC 627)
Discovered (Nov 16, 1827) by John Herschel (and later listed as NGC 618)
A 13th-magnitude lenticular galaxy (type S0) in Triangulum (RA 01 35 52.2, Dec +33 40 55)
Apparent size 1.4 by 1.4 arcmin. (for now, see the wide-field image of NGC 608)

NGC 615 (= PGC 5897)
Discovered (Jan 10, 1785) by
William Herschel
A 12th-magnitude spiral galaxy (type SA(rs)b) in Cetus (RA 01 35 05.7, Dec -07 20 25)
Apparent size 2.7 by 0.9 arcmin.
SDSS image of spiral galaxy NGC 615
Above, a 3 arcmin wide closeup of NGC 615
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 615

NGC 616
Recorded (Aug 14, 1863) by
Heinrich d'Arrest
A pair of stars in Triangulum (RA 01 36 04.2, Dec +33 46 15)

NGC 617 (= PGC 5831)
Discovered (1886) by
Francis Leavenworth (II-314)
A 15th-magnitude spiral galaxy (type SB(rs)ab) in Cetus (RA 01 34 02.5, Dec -09 46 25)
Apparent size 0.5 by 0.5 arcmin.
SDSS image of spiral galaxy NGC 617
Above, a 2.4 arcmin wide closeup of NGC 617
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 617

NGC 618 (=
NGC 614 = NGC 627 = PGC 5933)
Discovered (Sep 13, 1784) by William Herschel (and later listed as NGC 614)
Discovered (Nov 11, 1827) by John Herschel (and later listed as NGC 627)
Discovered (Nov 16, 1827) by John Herschel (and later listed as NGC 618)
A 13th-magnitude lenticular galaxy (type S0) in Triangulum (RA 01 35 52.2, Dec +33 40 55)
The identification of NGC 618 and 627 with NGC 614 seems dubious. As noted by Dreyer in the first Index Catalog, "NGC 618 and 627, = h136 and 141. Not observed by h in the same sweep as h134-135. Should be struck out. Neither of them seen by Burnham". (this entry will be primarily concerned with historical information and the identification, however dubious it might be, of NGC 618; for anything else see NGC 614)

NGC 619 (= PGC 5878)
Discovered (Nov 30, 1837) by
John Herschel
A 13th-magnitude spiral galaxy (type (R')SB(r)b) in Sculptor (RA 01 34 51.7, Dec -36 29 22)
Apparent size 1.5 by 1.0 arcmin. A complex ringed spiral galaxy (possibly a polar ring galaxy?). Used by de Vaucouleurs as an example of galaxy type (R1')SB(rs)ab.
DSS image of region near spiral galaxy NGC 619, also showing NGC 623
Above, a 12 arcmin wide DSS image centered on NGC 619, also showing NGC 623
Below, a 2.4 arcmin wide DSS image of NGC 619
DSS image of spiral galaxy NGC 619
Below, a 1.7 arcmin wide image of the galaxy (Image Credits: de Vaucouleurs Atlas, CTIO/NOAO)
Cerro Tololo image of spiral galaxy NGC 619, as shown on the Galaxy Morphology Website

NGC 620 (= PGC 5990)
Discovered (Dec 14, 1871) by
Édouard Stephan (3-2)
A 13th-magnitude compact galaxy (type C pec) in Andromeda (RA 01 36 59.6, Dec +42 19 22)
Apparent size 1.0 by 0.9 arcmin.
DSS image of compact galaxy NGC 620
Above, a 2.4 arcmin wide closeup of NGC 620
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near compact galaxy NGC 620

NGC 621 (= PGC 5984)
Discovered (Nov 24, 1883) by
Édouard Stephan (13-10)
A 13th-magnitude lenticular galaxy (type SB0) in Triangulum (RA 01 36 48.9, Dec +35 30 45)
Apparent size 1.2 by 1.0 arcmin.

NGC 622 (= PGC 5939)
Discovered (Oct 9, 1785) by
William Herschel
A 13th-magnitude spiral galaxy (type SB(rs)b) in Cetus (RA 01 36 00.1, Dec +00 39 49)
Apparent size 1.6 by 1.0 arcmin. A starburst galaxy.
DSS image of spiral galaxy NGC 622
Above, a 2.4 arcmin wide closeup of NGC 622
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 622

NGC 623 (= PGC 5898)
Discovered (Nov 30, 1837) by
John Herschel
A 13th-magnitude elliptical galaxy (type E3 pec) in Sculptor (RA 01 35 06.5, Dec -36 29 24)
Apparent size 2.0 by 1.5 arcmin. (for now, see the wide-field image of NGC 619)

NGC 624 (= PGC 5932)
Discovered (Nov 28, 1785) by
William Herschel
A 13th-magnitude spiral galaxy (type (R')SB(r)b pec) in Cetus (RA 01 35 51.2, Dec -10 00 11)
Apparent size 1.5 by 1.0 arcmin.
SDSS image of spiral galaxy NGC 624
Above, a 2.4 arcmin closeup of NGC 624
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 624

NGC 625 (= PGC 5896)
Discovered (Sep 2, 1826) by
James Dunlop (#479)
An 11th-magnitude spiral galaxy (NED type SB(s)m?) in Phoenix (RA 01 35 04.4, Dec -41 26 15)
Apparent size 7.5 by 1.9 arcmin. (Raw HST false-color images are available for parts of the galaxy, but will require considerable work to stitch together; so that will have to wait until the next iteration of this page.) Used by de Vaucouleurs as an example of galaxy type IB:(s)m sp.
DSS image of spiral galaxy NGC 625
Above, an 8 arcmin closeup of NGC 625
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 625
*note to self: add CTIO/NOAO image in next iteration of this page*

NGC 626 (= PGC 5901)
Discovered (Sep 4, 1834) by
John Herschel
A 13th-magnitude spiral galaxy (type SB(rs)c) in Sculptor (RA 01 35 11.9, Dec -39 08 46)
Apparent size 2.2 by 1.7 arcmin.
DSS image of spiral galaxy NGC 626
Above, a 2.4 arcmin closeup of NGC 626
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 626

NGC 627 (=
NGC 614 = NGC 618 = PGC 5933)
Discovered (Sep 13, 1784) by William Herschel (and later listed as NGC 614)
Discovered (Nov 11, 1827) by John Herschel (and later listed as NGC 627)
Discovered (Nov 16, 1827) by John Herschel (and later listed as NGC 618)
A 13th-magnitude lenticular galaxy (type S0) in Triangulum (RA 01 35 52.2, Dec +33 40 55)
The identification of NGC 618 and 627 with NGC 614 seems dubious. As noted by Dreyer in the first Index Catalog, "NGC 618 and 627, = h136 and 141. Not observed by h in the same sweep as h134-135. Should be struck out. Neither of them seen by Burnham". (this entry will be primarily concerned with historical information and the identification, however dubious it might be, of NGC 627; for anything else see NGC 614)

NGC 628 (=
M74 = PGC 5974)
Discovered (September 1780) by Pierre Méchain
Recorded (late 1780?) by Charles Messier as M74
A 9th-magnitude spiral galaxy (type SA(s)c) in Pisces (RA 01 36 41.7, Dec +15 47 00)
Apparent size 10.5 by 9.5 arcmin. Used by the de Vaucouleurs Atlas of Galaxy Types as an example of galaxy type Sa(s)c.
Gemini Observatory image of spiral galaxy NGC 628, also known as M74
Above, an image of NGC 628 (Image Credits & ©: (Gemini Observatory/AURA; per non-commercial educational license)
Below, a detail of the central region (Image Credits: NASA/ESA/Hubble Heritage (STScI/AURA)-ESA/Hubble; Acknowledgment R. Chandar (University of Toledo) and J. Miller (University of Michigan))
HST image of central region of spiral galaxy NGC 628, also known as M74
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 628, also known as M74

NGC 629
Discovered (1825) by
Wilhelm Struve (#2)
A group of stars in Cassiopeia (RA 01 39 02.1, Dec +72 52 06)
Apparent size 4.0 arcmin.

NGC 630 (= PGC 5924)
Discovered (Oct 23, 1835) by
John Herschel
A 12th-magnitude lenticular galaxy (type E/S0) in Sculptor (RA 01 35 36.6, Dec -39 21 28)
Apparent size 1.6 by 1.4 arcmin.

NGC 631 (= PGC 5983)
Discovered (Oct 27, 1864) by
Albert Marth (50)
A 13th-magnitude elliptical galaxy (type E2) in Pisces (RA 01 36 47.0, Dec +05 50 09)
Apparent size 1.0 by 0.8 arcmin.

NGC 632 (= PGC 6007)
Discovered (Sep 24, 1830) by
John Herschel
A 12th-magnitude lenticular galaxy (type S0) in Pisces (RA 01 37 17.5, Dec +05 52 38)
Apparent size 1.0 by 0.8 arcmin.

NGC 633 (= PGC 5960)
Discovered (Sep 1, 1834) by
John Herschel
A 13th-magnitude spiral galaxy (type SB(r)b) in Sculptor (RA 01 36 23.3, Dec -37 19 15)
Apparent size 1.4 by 1.2 arcmin. Recessional velocity 5190 km/sec. Given NGC 633's distorted shape and their similar recessional velocities, almost certainly a physical pair with PGC 5959.
DSS image of spiral galaxy NGC 633 and its probable companion, lenticular galaxy PGC 5959
Above, a 2.4 arcmin closeup of NGC 633 and its probable companion, PGC 5959
Below, a 12 arcmin wide region centered on NGC 633
DSS image of region near spiral galaxy NGC 633

PGC 5959
Not an NGC object but listed here due to its relationship with
NGC 633
A 14th-magnitude lenticular galaxy (type E/S0) in Sculptor (RA 01 36 24.2, Dec -37 20 26)
Apparent size 0.65 by 0.3 arcmin. Recessional velocity 5195 km/sec. Given NGC 633's distorted shape and their similar recessional velocities, almost certainly a physical pair with the larger galaxy (which see for images).

NGC 634 (= PGC 6059)
Discovered (Oct 26, 1876) by
Édouard Stephan (8-6)
A 13th-magnitude spiral galaxy (type Sa) in Triangulum (RA 01 38 18.6, Dec +35 21 53)
Apparent size 2.1 by 0.6 arcmin.
HST image of spiral galaxy NGC 634 superimposed on a DSS background to fill in missing areas
Above, a 2.4 arcmin closeup of NGC 634
Below, a detailed image of the galaxy (All Image Credits: ESA/Hubble/NASA)
HST image of spiral galaxy NGC 634
Below, a 12 arcmin wide region centered on NGC 634
HST image of spiral galaxy NGC 634 superimposed on a DSS background of the region near the galaxy

NGC 635 (= PGC 6062)
Discovered (Oct 15, 1885) by
Francis Leavenworth (I-33)
A 15th-magnitude spiral galaxy (type Sb) in Cetus (RA 01 38 17.9, Dec -22 55 44)
Apparent size 0.5 by 0.5 arcmin. (Note: A Wikisky search for the galaxy shows the correct object, but labeled as PGC 6062.)
DSS image of spiral galaxy NGC 635
Above, a 2.4 arcmin closeup of NGC 635
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 635

NGC 636 (= PGC 6110)
Discovered (Jan 10, 1785) by
William Herschel
A 12th-magnitude elliptical galaxy (type E3) in Cetus (RA 01 39 06.5, Dec -07 30 44)
Apparent size 2.8 by 2.0 arcmin.

NGC 637 (= OCL 329)
Discovered (Nov 9, 1787) by
William Herschel
An 8th-magnitude open cluster (type I3p) in Cassiopeia (RA 01 43 03.0, Dec +64 02 12)
Apparent size 3.0 arcmin.

NGC 638 (= PGC 6145)
Discovered (Oct 22, 1886) by
Lewis Swift (5-14)
A 14th-magnitude spiral galaxy (type SB(rs)b) in Pisces (RA 01 39 37.8, Dec +07 14 14)
Apparent size 0.8 by 0.5 arcmin.
SDSS image of spiral galaxy NGC 638
Above, a 2.4 arcmin closeup of NGC 638
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 638

NGC 639 (= PGC 6105)
Discovered (Sep 27, 1834) by
John Herschel
A 14th-magnitude spiral galaxy (type Sa) in Sculptor (RA 01 38 59.1, Dec -29 55 30)
Apparent size 1.0 by 0.2 arcmin.
DSS image of spiral galaxy NGC 639 and part of spiral galaxy NGC 642
Above, a 2.4 arcmin closeup of NGC 639 and part of NGC 642
Below, a 12 arcmin wide region centered on nearby galaxy NGC 642, also showing NGC 639
DSS image of region near spiral galaxies NGC 639 and NGC 642

NGC 640 (= PGC 6130)
Discovered (1886) by
Francis Leavenworth (II-315)
A 14th-magnitude spiral galaxy (type Sa) in Cetus (RA 01 39 24.9, Dec -09 24 04)
Apparent size 0.7 by 0.5 arcmin. A Seyfert galaxy (type Sy 2).
SDSS image of spiral galaxy NGC 640
Above, a 2.4 arcmin closeup of NGC 640
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 640

NGC 641 (= PGC 6081)
Discovered (Sep 5, 1834) by
John Herschel
A 12th-magnitude lenticular galaxy (type E/S0) in Phoenix (RA 01 38 39.0, Dec -42 31 39)
Apparent size 1.4 by 1.3 arcmin. (For now, see the wide-field image of NGC 644.)

NGC 642 (= PGC 6112)
Discovered (Sep 27, 1834) by
John Herschel
A 12th-magnitude spiral galaxy (type SBc) in Sculptor (RA 01 39 06.2, Dec -29 54 55)
Apparent size 2.0 by 1.1 arcmin.
DSS image of spiral galaxy NGC 642
Above, a 2.4 arcmin closeup of NGC 642
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 639
DSS image of region near spiral galaxies NGC 639 and NGC 642

NGC 643 (= PGC 643991), in the Small Magellanic Cloud
Discovered (Sep 18, 1835) by
John Herschel
An open cluster in Hydrus (RA 01 35 00.7, Dec -75 33 24)
Apparent size 1.5 arcmin. (Note: Wikisky incorrectly lists this as being in Octans, even though it is well inside Hydrus, and all surrounding stars are correctly shown by Wikisky as being in Hydrus. It also lists the object not as NGC 643, but as PGC 243991. The PGC number is correct, but since PGC stands for Principle Galaxy Catalog, the open cluster's PGC listing is an error in that catalog.) Although "in" the Small Magellanic Cloud, NGC 643 is actually well outside the apparent boundary of that galaxy, and must be one of the SMC's most distant clusters.
DSS image of open cluster NGC 643, in the Small Magellanic Cloud
Above, a 2.4 arcmin wide closeup of NGC 643
Below, a 12 arcmin wide region centered on the cluster
DSS image of region near open cluster NGC 643, in the Small Magellanic Cloud
Below, a 4 degree wide region showing the cluster's position relative to the SMC
DSS image showing position of open cluster NGC 643 relative to the Small Magellanic Cloud

"NGC 643A", in the Small Magellanic Cloud
Not an NGC object but sometimes called NGC 643A since in general region of
NGC 643
An 11th-magnitude open cluster in Hydrus (RA 01 30 37.4, Dec -76 03 18)
Apparent size 2.0 by 2.0 arcmin. Like NGC 643, although "in" the Small Magellanic Cloud, well outside its apparent outline.
DSS image of the open cluster commonly called NGC 643A, in the Small Magellanic Cloud
Above, a 2.4 arcmin wide closeup of "NGC 643A"
Below, a 12 arcmin wide region centered on the cluster
DSS image of region near the open cluster commonly called NGC 643A, in the Small Magellanic Cloud
Below, a 36 arcmin wide region showing the relative positions of NGC 643 and "NC 643A"
DSS image of region between open cluster NGC 643 and the open cluster commonly called NGC 643A, in the Small Magellanic Cloud
Below, a 4 degree wide region showing the cluster's position relative to the SMC
DSS image showing position of open clusters NGC 643 and 'NGC 643A' relative to the Small Magellanic Cloud

PGC 6117 (= "NGC 643B")
Not an NGC object but sometimes called NGC 643B since in general region of
NGC 643
A 14th-magnitude lenticular galaxy (type SB0) in Hydrus (RA 01 39 13.4, Dec -75 00 41)
Apparent size 1.5 by 0.3 arcmin.

PGC 6256 (= "NGC 643C")
Not an NGC object but sometimes called NGC 643C since in general region of
NGC 643
A 15th-magnitude spiral galaxy (type Scd?) in Hydrus (RA 01 41 48.9, Dec -75 16 03)
Apparent size 1.3 by 0.2 arcmin.
DSS image of spiral galaxy PGC 6256, also known as NGC 643C
Above, a 2.4 arcmin wide closeup of PGC 6256
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy PGC 6256, also known as NGC 643C

NGC 644 (= PGC 6097)
Discovered (Sep 5, 1834) by
John Herschel
A 14th-magnitude spiral galaxy (type SB(r)bc) in Phoenix (RA 01 38 52.8, Dec -42 35 08)
The second Index Catalog notes "Not found by Swift. h observed it twice". Apparent size 1.3 by 0.6 arcmin.
DSS image of spiral galaxy NGC 644
Above, a 2.4 arcmin closeup of NGC 644
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 641
DSS image of region near spiral galaxy NGC 644, also showing lenticular galaxy NGC 641

NGC 645 (= PGC 6172)
Discovered (Oct 27, 1864) by
Albert Marth (51)
A 13th-magnitude spiral galaxy (type SBb?) in Pisces (RA 01 40 08.8, Dec +05 43 34)
Apparent size 2.6 by 1.2 arcmin.
SDSS image of spiral galaxy NGC 645
Above, a 3 arcmin wide closeup of NGC 645
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy NGC 645

NGC 646 (= PGC 6010)
Discovered (Nov 2, 1834) by
John Herschel
A 14th-magnitude spiral galaxy (type SBc) in Hydrus (RA 01 37 21.1, Dec -64 53 43)
Apparent size 2.0 by 1.5 arcmin. Although interacting with PGC 6014, the two galaxies have a difference of nearly 1000 km/sec in their radial velocities, so their current interaction is likely to be short-lived (though the effects of that interaction may be considerably longer-lasting). (Listed in NED as NGC 0646 NED01.)
DSS image of spiral galaxy NGC 646 and its apparent companion, lenticular galaxy PGC 6014
Above, a 2.4 arcmin wide closeup of NGC 646 and its apparent companion, PGC 6014
Below, a 12 arcmin wide region centered on the galaxy
DSS image of region near spiral galaxy NGC 646 and its apparent companion, lenticular galaxy PGC 6014

PGC 6014
Not an NGC object, but listed here because interacting with
NGC 646
A 15th-magnitude lenticular galaxy (type E/S0) in Hydrus (RA 01 37 30.0, Dec -64 53 45)
Apparent size 0.4 by 0.4 arcmin. Although interacting with NGC 646 (which see for images), the two galaxies have a difference of nearly 1000 km/sec in their radial velocities, so their current interaction is likely to be short-lived (though the effects of that interaction may be considerably longer-lasting). (Listed in NED as NGC 0646 NED02.)

NGC 647 (= PGC 6155)
Discovered (1886) by
Francis Leavenworth (II-316)
A 13th-magnitude lenticular galaxy (type S0) in Cetus (RA 01 39 56.1, Dec -09 14 31)
Apparent size 1.5 by 1.1 arcmin. (For now, see the wide field image of NGC 649.)

NGC 648 (=
IC 146 = PGC 6083 = PGC 144217 = PGC 876776)
Discovered (1886) by Francis Leavenworth (I-34) (and later listed as NGC 648)
Discovered (Sep 30, 1892) by Stephane Javelle (and later listed as IC 146)
A 14th-magnitude lenticular galaxy (type SA0 pec) in Cetus (RA 01 38 39.8, Dec -17 49 52)
The second Index Catalog lists a corrected RA (per Howe) of 01 31 54. (See IC 146 for a discussion of the double listing.) Based on a recessional velocity of 10595 km/sec, a straightforward calculation indicates that NGC 648 is about 495 million light years away. However, for objects at such a distance, we should take into account the expansion of the Universe during the time it took their light to reach us. Doing that shows that the galaxy was about 475 million light years away when the light by which we see it was emitted, about 480 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of 1.0 by 0.5 arcmin, it is about 140 thousand light years across.
SDSS image of lenticular galaxy NGC 648
Above, a 2.4 arcmin wide closeup of NGC 648
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near lenticular galaxy NGC 648

NGC 649 (= PGC 6169)
Discovered (1886) by
Francis Leavenworth (II-317)
A 14th-magnitude spiral galaxy (type Sa) in Cetus (RA 01 40 07.5, Dec -09 16 18)
Apparent size 0.9 by 0.3 arcmin.
SDSS image of spiral galaxy NGC 649
Above, a 2.4 arcmin wide closeup of NGC 649
Below, a 12 arcmin wide region centered on the galaxy, also showing NGC 647
SDSS image of region near spiral galaxy NGC 649, also showing lenticular galaxy NGC 647
Celestial Atlas
(NGC 550 - 599) ←     NGC Objects: NGC 600 - 649     → (NGC 650 - 699)