Apparent size 0.55 by 0.45 arcmin. A starburst galaxy.

Apparent size 1.4 by 0.7 arcmin?

Apparent size 0.4 by 0.3 arcmin?

This entry will be primarily concerned with historical information; for anything else see NGC 3855.

Apparent size 0.9 by 0.9 arcmin?

Apparent size 1.2 by 0.8 arcmin?

Apparent size 0.8 by 0.4 arcmin?

Apparent size 0.5 by 0.4 arcmin?

This entry will be primarily concerned with historical information; for anything else see NGC 3871.

Apparent size 0.5 by 0.3 arcmin?

Apparent size 0.2 by 0.1 arcmin?

Historical Identification: Per Dreyer, NGC 2963 (Bigourdan #284, 1860 RA 11 42 15, NPD 94 20) is "very difficult, 12th magnitude star 20 arcsec to west northwest". The position precesses to RA 11 49 24.3, Dec -05 06 41, only about 0.4 arcmin north of the nucleus of the galaxy listed above, the description fits and there is nothing else nearby, so the identification is certain.
Historical Misidentification as NGC 3915: IC 2963 is usually listed as a duplicate observation of NGC 3915, but as discussed in the entry for that object, it is almost certainly lost or nonexistent, and Bigourdan's description is about as far as imaginable from either Herschel's or Peters' descriptions of NGC 3915, and although several galaxies have been suggested as candidates for that entry, Corwin's notes list IC 2963 as the least likely of all of them to be correct, whence the warning in the title for this entry.
Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 2035 km/sec (and H₀ = 70 km/sec/Mpc), IC 2963 is about 95 million light years away, in fair agreement with a single redshift-independent distance estimate of about 75 to 80 million light years. Given that and its apparent size of about 1.65 by 0.3 arcmin (from the images below), the galaxy is about 45 thousand light years across.

This entry will be primarily concerned with historical information; for anything else see NGC 3957.

Apparent size 3.0 by 2.0 arcmin?

Apparent size 0.9 by 0.7 arcmin?

Apparent size 0.8 by 0.4 arcmin?

Apparent size 1.3 by 0.8 arcmin.

Apparent size 0.3 by 0.2 arcmin?

This entry will be primarily concerned with historical information; for anything else see NGC 3952.

Apparent size 1.35 by 0.75 arcmin.

Apparent size 2.2 by 0.5 arcmin?

This entry will be primarily concerned with historical information; for anything else see NGC 3979.

Apparent size 1.6 by 0.7 arcmin?

Apparent size 1.1 by 0.4 arcmin?

Historical Identification: Per Dreyer, IC 2979 (= Javelle #1201, 1860 RA 11 49 40, NPD 56 03.8) is "faint, small, round, a little brighter middle, mottled but not resolved". Unfortunately, as noted by Corwin, Javelle's comparison star for IC 2979 and 2981 had a one degree error in its declination, so the NGC position precesses to RA 11 56 53.9, Dec +33 09 27, and there is nothing there nor anywhere near there. However, applying the appropriate correction to the comparison star's position, the corrected NGC position precesses to RA 11 56 53.8, Dec +32 09 27, which falls on the western rim of the galaxy listed above, the description fits (the galaxy is actually extended, but the bright part that could be seen by Javelle is more nearly round than not) and there is nothing else nearby, so the identification is certain.
Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 3405 km/sec (and H₀ = 70 km/sec/Mpc), IC 2979 is about 155 to 160 million light years away, considerably less than a single redshift-independent distance estimate of about 225 million light years. Given that and its apparent size of about 0.7 by 0.5 arcmin (from the images below), the galaxy is about 30 to 35 thousand light years across.

Apparent size 1.2 by 1.0 arcmin?

Historical Identification: Per Dreyer, IC 2981 (= Javelle #1202, 1860 RA 11 50 36, NPD 56 01.9) is "faint, small, round, gradually a very little brighter middle". The position precesses to RA 11 43 18.4, Dec +34 44 48, but there is nothing there nor anywhere near there. Fortunately, the problem involved in identifying Javelle's object is easily solved, as noted by Corwin. Namely, as in the case of IC 2979, Javelle made a one degree error in the declination of his comparison star, and in this case he also accidentally reversed the direction of the offset in right ascension. Applying corrections for those mistakes, Javelle's position falls within 3 arcsec of the galaxy listed above, the description fits and there is nothing else nearby, so save for the confusion introduced by the errors noted above, the identification is certain.
Discovery Note: Unfortunately, in an appendix of the IC2, Dreyer included a note based on Max Wolf's misidentification of this object as NGC 3966, stating "NGC 3966: RA is 11 48 29, Wolf list VIII (#178)". That note was incorrect in two ways: Less importantly, it used only part of Wolf's full position (1875 RA 11 49 15.2, NPD 57 06 56 = 1860 RA 11 48 28.5, NPD 57 01 56 = J2000 RA 11 55 42.9, Dec +32 11 20; and catastrophically, it "correctly" used Wolf's misidentification of the object. As it happens, Wolf's position falls on the northeastern outline of IC 2981, and as a result of Wolf's misidentification and Dreyer's IC2 note, IC 2981 is more often misidentified as NGC 3966 than correctly identified as IC 2981 (hence the need to point out that error in the title of this entry).
Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 3715 km/sec (and H₀ = 70 km/sec/Mpc), IC 2981 is about 170 to 175 million light years away. Given that and its apparent size of about 0.4 by 0.3 arcmin (from the images below), it is about 20 thousand light years across.

Historical Identification:
Warning About Non-Standard Designation: IC 2982 is sometimes called "NGC 4004B". Such non-standard letter designations are always an abomination, especially in a case like this, where the object already has a perfectly good NGC/IC designation. (The link provides an explanation of why such non-standard designations should never be used, but is otherwise only a warning against such usage.)
Physical Information: Apparent size 0.5 by 0.3 arcmin?

Historical Identification: Per Dreyer, IC 2983 (= Bigourdan #286, 1860 RA 11 51 08, NPD 91 18) is "extremely faint". The position precesses to RA 11 58 18.2, Dec -02 04 46 (whence the position above), but there is nothing there nor anywhere near there that could possibly be Bigourdan's object, given how precise his measurements were. So although it is possible that Bigourdan #286 might be some unknown star, it must be considered lost or nonexistent.
Misidentification As NGC 4006: Since NGC 4006 is located only a few arcmin southwest of Bigourdan's position for IC 2983, some references list that as IC 2983; but Bigourdan observed NGC 4006 on the same night that he recorded IC 2983, so they cannot be the same object, and the misidentification is exactly that.
Physical Information: Since there is no way of knowing what the object is (or if it even existed), there is nothing available about its nature.

Apparent size 1.0 by 0.7 arcmin.

Apparent size 1.0 by 0.4 arcmin.

Apparent size 0.7 by 0.6 arcmin?

Apparent size 0.5 by 0.3 arcmin?

This entry will be primarily concerned with historical information; for anything else see NGC 4139.

Apparent size 0.8 by 0.3 arcmin?

Apparent size 0.7 by 0.2 arcmin?

Apparent size 0.6 by 0.5 arcmin?

Apparent size 0.7 by 0.55 arcmin. IC 2993 is sometimes misidentified as PGC 3167495, hence the discussion immediately following.

(More to follow in the next iteration of this page.)

Apparent size 0.3 by 0.2 arcmin?

Apparent size 3.0 by 0.8 arcmin?

Apparent size 1.6 by 0.4 arcmin?

Based on a recessional velocity of 6975 km/sec, IC 2999 is about 325 million light years away. Given that and its apparent size of 0.7 by 0.25 arcmins, it is about 65 thousand light years across.