Based on a recessional velocity of 6945 km/sec, IC 3450 is about 325 million light years away. Given that and its apparent size of 0.4 by 0.2 arcmin, it is about 35 thousand light years across.

Apparent size 0.75 by 0.55 arcmin.

(Herschel and Schwassmann's positions are both excellent, so the identification is certain, and the double listing is due to simple oversight; for anything else, see NGC 4497.)

Apparent size 1.25 by 0.35 arcmin. Listed as a member (VCC 1374) of the Virgo Cluster.

Apparent size 1.25 by 0.25 arcmin.

Apparent size 0.4 by 0.2 arcmin.

Per Dreyer, IC 3456 (Wolf list IV #171, 1860 RA 12 24 46, NPD 60 52.1) is "very faint, pretty small, irregular figure". The position precesses to RA 12 31 43.7, Dec +28 21 29 (whence the position above), but there is nothing there nor anywhere near there. Per Corwin, there is nothing near the position even on Wolf's original plate, so the entry must be the result of a measurement or reduction error; but with hundreds of faint stars and galaxies on the plate, there is no way to know which if any of them are what Wolf recorded. So the IC object can only be listed as lost or nonexistent.

Apparent size 1.2 by 0.7 arcmin. Listed as a member (VCC 1386) of the Virgo Cluster.

Apparent size 0.45 by 0.35 arcmin.

Apparent size 1.15 by 0.8 arcmin. Listed as a member (VCC 1392) of the Virgo Cluster.

Apparent size 0.8 by 0.15 arcmin.

Apparent size 0.8 by 0.65 arcmin. Listed as a member (VCC 1407) of the Virgo Cluster.

Apparent size 0.75 by 0.4 arcmin. Listed as a member (VCC 1417) of the Virgo Cluster.

Per Dreyer, IC 3463 (Schwassmann 202, 1860 RA 12 25 00, NPD 76 54.3) is "very faint, considerably small, extended 40°". The position precesses to RA 12 32 05.0, Dec +12 19 17, between the pair of stars listed above, and their relative positions fit the 40° extension, so the identification is certain.

Per Dreyer, IC 3464 (Wolf list IV #174, 1860 RA 12 25 02, NPD 63 13.3) is "extremely faint, very small, brighter middle, spiral". The position precesses to RA 12 32 00.8, Dec +26 00 17, just east of the star listed above. Per Corwin, a print of the original plate shows a defect superimposed on the star, "so it is not surprising that Wolf mistook it for a faint nebula", and the identification is certain.

Apparent size 0.55 by 0.35 arcmin. Listed as a member (VCC 1420) of the Virgo Cluster.

Apparent size 0.65 by 0.46 arcmin. Listed as a member (VCC 1411) of the Virgo Cluster.

Apparent size 1.1 by 0.25. Listed as a member (VCC 1429) of the Virgo Cluster.

Apparent size 1.7 by 1.3 arcmin. Listed as a member (VCC 1422) of the Virgo Cluster.

Apparent size 0.2 by 0.15 arcmin.

Apparent size 0.95 by 0.85 arcmin. Listed as a member (VCC 1431) of the Virgo Cluster.

Apparent size 0.95 by 0.55 arcmin. Listed as a member (VCC 1427) of the Virgo Cluster.

Apparent size 0.4 by 0.3 arcmin.

Apparent size 1.3 by 0.8 arcmin.

Apparent size 2.4 by 0.4 arcmin. Listed as a member (VCC 1442) of the Virgo Cluster.

Apparent size 2.2 by 1.7 arcmin. Listed as a member (VCC 1448) of the Virgo Cluster.

Apparent size 2.2 by 1.5 arcmin. Listed as a member (VCC 1450) of the Virgo Cluster.

Per Dreyer, IC 3477 (Wolf list IV #177, 1860 RA 12 25 40, NPD 63 11.1) is "very faint, very small, brighter middle, spiral". The position precesses to RA 12 32 38.5, Dec +26 02 30, just north of the star listed above, and there is nothing else nearby, so the identification is reasonably certain.

Apparent size 1.3 by 1.0 arcmin. Listed as a member (VCC 1453) of the Virgo Cluster.

Apparent size 0.3 by 0.15 arcmin. Recessional velocity and distance unknown, but undoubtedly large.

Per Dreyer, IC 3480 (Wolf list IV #179, 1860 RA 12 25 44, NPD 62 23.9) is "very faint, small, extended 90°, brighter middle". The position precesses to RA 12 32 42.1, Dec +26 49 42, just east of the pair of stars listed above, and since there is nothing else nearby and the relative orientation of the stars agrees with "extended 90°", the identification seems certain. (Per Corwin, IC 3480 was mistakenly equated with IC 3490 in the MOL (Master List of Nonstellar Optical Astronomical Objects), possibly as the result of a typographical error; that is the reason for the warning in the title for this entry.)

Apparent size 1.1 by 1.0 arcmin. Listed as a member (VCC 1462) of the Virgo Cluster.

Apparent size 0.7 by 0.4 arcmin. Although part of Arp 175 (= Zwicky's Triplet), PGC 41646 is not actually connected to either of its apparent companions, as it is much further away. Given that, the tracery between IC 3481 (which see for images) and IC 3483 that passes in front of PGC 41646 is merely a coincidental overlap.

Apparent size 0.4 by 0.15 arcmin.

Apparent size 0.9 by 0.5 arcmin. Listed as a member (VCC 1486) of the Virgo Cluster.

Apparent size 0.8 by 0.5 arcmin. Listed as a member (VCC 1476) of the Virgo Cluster.

Per Dreyer, IC 3485 (Schwassmann 112, 1860 RA 12 26 05, NPD 80 00.5) is "extremely faint, small; questionable". The position precesses to RA 12 33 11.2, Dec +09 13 07, right on the star listed above, and there is nothing else nearby, so the identification seems certain.

Apparent size 0.9 by 0.6 arcmin. Listed as a member (VCC 1491) of the Virgo Cluster.

Apparent size 1.1 by 0.6 arcmin. Listed as a member (VCC 1488) of the Virgo Cluster.

Apparent size 0.7 by 0.65 arcmin.

Apparent size 0.5 by 0.5 arcmin. Listed as a member (VCC 1490) of the Virgo Cluster, but not actually a member, since much further away.

Apparent size 0.9 by 0.45 arcmin. Listed as a member (VCC 1489) of the Virgo Cluster.

Apparent size 1.0 by 0.2 arcmin.

Apparent size 0.65 by 0.55 arcmin. Listed as a member (VCC 1499) of the Virgo Cluster. (See IC 3486 for images.)

Per Dreyer, IC 3493 (Schwassmann 114, 1860 RA 12 26 15, NPD 79 50.2) is "extremely faint, very small". The position precesses to RA 12 33 21.1, Dec +09 23 25 (whence the position above), a little to the east of IC 3487, and almost on top of a 12th-magnitude star. However, that star cannot be IC 3493, as (per Corwin) Schwassmann had a separate measurement of the position of that star accurate to within a few arcseconds (in other words, within the apparent size of its image). Corwin supposes that a plate defect might have been involved, but the plate has gone missing, and as a result he suggests that despite requiring a substantial measurement error, the most reasonable candidate for IC 3493 is the 13th-magnitude star at RA 12 33 18.9, Dec +09 23 35 (between the 12th-magnitude star and IC 3487), and that star is listed as IC 3493 in most catalogs. However, given the fact that Schwassmann measured the position of the brighter star and IC 3487 to within arcseconds of their actual positions, it seems unlikely that he would have made such a large positional error for the fainter star, and given the substantial number of IC2 objects that represent plate defects, I think that whatever the cause, IC 3493 must represent a nonexistent object.

Apparent size 0.25 by 0.25 arcmin.

Per Dreyer, IC 3495 (Wolf list IV #184, 1860 RA 12 26 19, NPD 62 25.2) is "very faint, considerably small, irregular figure, difficult". The position precesses to RA 12 33 16.8, Dec +26 48 25, just southeast of the star listed above, and there is nothing else nearby so the identification is considered certain. (Corwin states that when "I was young and naive" he suggested that PGC 86324 might be IC 3495, so the reader may run across that mistaken identification. Also, the star is usually listed as being a blended visual binary, but that is incorrect; as far as visual observations are concerned, it is a single star.)

Apparent size 0.3 by 0.2 arcmin.

Per Dreyer, IC 3496 (Wolf list IV #185, 1860 RA 12 26 21, NPD 62 28.0) is "very faint, considerably small, irregular figure, 15th magnitude star involved to south". The position precesses to RA 12 33 18.8, Dec +26 45 37 (whence the position above), just north of the 17th-magnitude star which as noted above is usually identified as the IC object. Per Corwin, on Wolf's plate that star appears considerably elongated to the north, so the "star involved to south" must be the 17th-magnitude star, and Wolf's IV-185 must be a plate defect superimposed on the image of the star. In other words, IC 3496 actually represents a nonexistent object, but given its "involvement" with the star, it isn't entirely unreasonable to treat the star as if it were the IC object. (Further complicating things, Corwin also notes that very early on he assigned a nearby galaxy to IC 3496, and although he has corrected his error (the galaxy is actually IC 3498), the galaxy is often misidentified as IC 3496.)

Per Dreyer, IC 3497 (Wolf list IV #186, 1860 RA 12 26 30, NPD 63 44.3) is "very faint, very small, round, brighter middle". The position precesses to RA 12 33 28.4, Dec +25 29 19, right on the star listed above, and there is nothing else nearby so the identification is certain. (Corwin states that the star is clearly seen on a print of the original plate.)

Per Dreyer, IC 3498 (Wolf list IV #187, 1860 RA 12 26 31, NPD 62 29.4) is "very faint, small, irregular figure". The position precesses to RA 12 33 28.8, Dec +26 44 13, right on the galaxy, so the identification is certain. However, Corwin notes that at one time he mistakenly assigned the galaxy to IC 3496, and the error was picked up by others and persists to this day; hence the warning in the title. Apparent size 0.75 by 0.25 arcmin.

Apparent size 1.8 by 0.5 arcmin. Listed as a member (VCC 1521) of the Virgo Cluster.