Historical Identification: Per Dreyer, IC 4500 (= Javelle #1338, 1860 RA 14 39 00, NPD 51 56.2) is "faint, small, round, gradually brighter middle". The position precesses to RA 14 44 36.3, Dec +37 28 13, only a third of an arcmin south southeast of the galaxy listed above, and there is nothing else nearby so the identification is certain.
Physical Information: Based on a recessional velocity of 4220 km/sec, IC 4500 is about 195 million light years away. Given that and its apparent size of 0.5 by 0.35 arcmin, it is about 30 thousand light years across.

Historical Identification: Per Dreyer, IC 4501 (= DeLisle Stewart #416, 1860 RA 14 39 25, NPD 111 48) is "very faint, small, indistinct". The position precesses to RA 14 47 25.0, Dec -22 23 23, only an arcmin north of the galaxy listed above and there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size 1.1 by 0.6 arcmin.

Historical Identification: Per Dreyer, IC 4502 (= Javelle #1339, 1860 RA 14 39 39, NPD 52 06.8) is "faint, small, diffuse, mottled but not resolved, 14th magnitude star very near". The position precesses to RA 14 45 15.5, Dec +37 17 42, less than half an arcmin south of the galaxy listed above and there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size 0.8 by 0.3 arcmin. Probably an actual pair with its apparent companion, PGC 2097391.

Historical Identification: Per Dreyer, IC 4503 (= Frost #1135, 1860 RA 14 40 08, NPD 73 17) is "faint, very small, round". The position precesses to RA 14 46 42.2, Dec +16 07 37, about 1.2 arcmin southeast of the galaxy listed above, but there is nothing else nearby so the identification seems certain.
Physical Information: Apparent size 0.7 by 0.55 arcmin.

Historical Identification: Per Dreyer, IC 4504 (= Javelle #1340, 1860 RA 14 40 43, NPD 57 42.3) is "faint, small, round, nuclear, mottled but not resolved". The position precesses to RA 14 46 36.7, Dec +31 42 22, less than half an arcmin north of the galaxy listed above and there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size 0.8 by 0.4 arcmin.

Historical Identification: Per Dreyer, IC 4505 (= Javelle #1341, 1860 RA 14 40 45, NPD 56 00.3) is "faint, small, round, nuclear". The position precesses to RA 14 46 33.6, Dec +33 24 21, right on the galaxy listed above, so the identification is certain.
Physical Information: Apparent size 1.2 by 0.9 arcmin.

Historical Identification: Per Dreyer, IC 4506 (= Javelle #1342, 1860 RA 14 40 52, NPD 56 00.8) is "very faint, very small, nuclear". The position precesses to RA 14 46 40.6, Dec +33 23 52, on the southeastern rim of the galaxy listed above, and the consistency of Javelle's measurements for this and IC 4505 fits the pair of galaxies so well that the identification is certain.
Physical Information: Apparent size 0.5 by 0.5 arcmin.

Historical Identification: Per Dreyer, IC 4507 (= Frost #1336, 1860 RA 14 41 15, NPD 70 58) is "very faint, extremely small, round" (since Frost's list is in order of right ascension, Frost #1336 is an obvious typographical error; this is actually Frost #1136). The position precesses to RA 14 47 43.6, Dec +18 26 46, about half an arcmin southeast of the galaxy listed above and there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size 0.75 by 0.4 arcmin.

Historical Identification: Per Dreyer, IC 4508 (= Javelle #1343, 1860 RA 14 41 57, NPD 57 38.5) is "faint, small, round, suddenly brighter middle equivalent to 14th magnitude star". The position precesses to RA 14 47 50.1, Dec +31 46 19, half an arcmin north northwest of the galaxy listed above, and the description fits, so the identification is reasonably certain. There is a fainter, more distant galaxy (PGC 3833892) directly northeast of PGC 52843, and at first glance it might be supposed that both galaxies could be considered part of the IC entry, but Javelle could not have seen the fainter galaxy, so it is not part of IC 4508. However, as a result of the galaxies' apparent proximity it is common for data that applies to one being mistakenly applied to the other; for instance, NED has mostly correct physical information for IC 4508, but mistakenly uses the position for PGC 3833892, and a secondary z of 0.055676 attributed to IC 4508 also belongs to the other galaxy. Because of such confusion, even though not part of IC 4508, PGC 3833892 is discussed immediately below.
Physical Information: Based on a recessional velocity of 13620 km/sec, a straightforward calculation indicates that IC 4508 is about 635 million light years away. However, for objects at such distances 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 600 million light years away at the time the light by which we see it was emitted, about 615 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 0.45 by 0.45 arcmin, the galaxy is about 80 thousand light years across.

Historical Identification: See IC 4508 for a discussion of the problems caused by the apparent proximity of that galaxy and PGC 3833892.
Physical Information: Based on a recessional velocity of 16800 km/sec, a straightforward calculation indicates that PGC 3833892 is about 780 million light years away. However, for objects at such distances 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 730 million light years away at the time the light by which we see it was emitted, about 750 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 0.4 by 0.15 arcmin, the galaxy is about 85 thousand light years across. Note that despite its apparent proximity to IC 4508 (which see for images), PGC 3833892 is only an "optical double", as it is over a hundred million light years further away.

Historical Identification: Per Dreyer, IC 4509 (= Javelle #1344, 1860 RA 14 42 33, NPD 57 37.0) is "faint, considerably small, irregular figure, mottled but not resolved". The position precesses to RA 14 48 25.8, Dec +31 47 54, less than half an arcmin northwest of the galaxy listed above, and there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size of 0.9 by 0.3 arcmin.

Historical Identification: Per Dreyer, IC 4510 (= DeLisle Stewart #417, 1860 RA 14 42 44, NPD 110 09) is "very faint, very small, irregularly round, suspected". The position precesses to RA 14 50 40.7, Dec -20 43 56 (whence the position above), but there is nothing there nor anywhere near there so odds are it is nonexistent. Corwin notes that the plate in question had only a short exposure, so for the object to be real it would have to be fairly bright, and he suspects that given the description, it was probably a plate defect.

Historical Identification: Per Dreyer, IC 4511 (= Frost #1137, 1860 RA 14 43 10, NPD 129 55) is "considerably small, round, a little brighter middle, diffuse". The position precesses to RA 14 52 05.9, Dec -40 29 49 (whence the position above), but there is nothing there nor anywhere near there. Per Corwin, Frost's description reads "diffuse, round, a little brighter middle, diameter 0.6 arcmin"; since there is nothing like that anywhere nearby, Corwin suspects this was a plate defect, and the "object" is almost certainly nonexistent.

Historical Identification: Per Dreyer, IC 4512 (= Javelle #1345, 1860 RA 14 43 49, NPD 61 43.1) is "very faint, small, round". The position precesses to RA 14 49 53.1, Dec +27 41 59, less than half an arcmin west of the galaxy listed above, and there is nothing else nearby, so the identification is certain.
Physical Information: Apparent size of 0.5 by 0.45 arcmin.

Historical Identification: Per Dreyer, IC 4513 (= DeLisle Stewart #419, 1860 RA 14 44 20, NPD 110 09) is "faint, small, very extended 80°". The position precesses to RA 14 52 17.0, Dec -20 43 43, but there is nothing there. Per Corwin, this "object" was recorded on the same plate as IC 4510, and would have to be fairly bright for Stewart to have seen it. Since there is nothing in the region that is either reasonably bright or resembles the description, this was probably a plate defect, and not a real object.

Historical Identification: Per Dreyer, IC 4514 (= Swift list XI (#175), Javelle #1346, 1860 RA 14 44 51, NPD 61 48.5) is "faint, small, round, nuclear, 13th magnitude star very near". (Swift's #175 was observed on Jun 2, 1898, so Javelle is the discoverer, but Swift's note was presumably used by Dreyer as confirmation of the object's existence.) The position precesses to RA 14 50 55.0, Dec +27 36 44, about two arcmin north of the galaxy listed above, and there is nothing else nearby, so the identification appears reasonably certain. In addition, per Thomson, Javelle used Argelander's position for his comparison star, which (compared to modern data) was 1 arcmin 58 arcsec too far north; applying the appropriate correction for that error puts Javelle's position right on the galaxy, so the identification is absolutely certain.
Physical Information: Apparent size of 0.75 by 0.65 arcmin.

Historical Identification: Per Dreyer, IC 4515 (= Javelle #1347, 1860 RA 14 45 34, NPD 51 48.9) is "faint, small, round, gradually brighter middle, mottled but not resolved". The position precesses to RA 14 51 06.7, Dec +37 36 23, but there is nothing there. However, per Corwin and Thomson, Javelle simply made a mistake in the sign of his offset for the star's declination, placing it 3' 20" north of his comparison star, instead of 3' 20" south; correcting for that error, Javelle's position lands right on the galaxy listed above. So despite the original mistake, the identification is virtually certain.
Physical Information: Apparent size of 0.7 by 0.45 arcmin.

Historical Identification: Per Dreyer, IC 4516 (= Swift list XI (#176), 1860 RA 14 47 23, NPD 73 02.6) is "very faint, pretty small, round". The position precesses to RA 14 53 55.3, Dec +16 23 00, but there is nothing there. Per Thomson, the problem is that Dreyer's precessional correction in right ascension (from 1900 to 1860) is considerably off. Swift's paper lists a 1900 position of RA 14 49 37, Dec +16 47.5, which precesses to 1860 14 47 45.0, NPD 73 02.6, or 22 seconds of time east of the IC2 position. Precessing Swift's actual position yields a J2000 position of RA 14 54 17.3, Dec +16 23 04, just over 2 arcmin northwest of the galaxy listed above, and there is nothing else nearby so the identification is reasonably certain. (This was Swift's last discovery, after more than half a century of astronomical observations beginning with an observation of the Great Comet of 1843, three days before its official discovery was announced.)
Physical Information: Apparent size of 1.1 by 0.8 for brighter central regions, and 1.7 by 1.0 arcmin including fainter outer regions.

Historical Identification: Per Dreyer, IC 4517 (= Javelle #1348, 1860 RA 14 48 22, NPD 65 46.6) is "faint, small, nuclear, diffuse". The position precesses to RA 14 54 35.8, Dec +23 39 07, less than half an arcmin north northeast of the galaxy listed above, and there is nothing else nearby so the identification is certain.
Physical Information: Apparent size of 1.2 by 0.3 arcmin.

Historical Identification: Per Dreyer, IC 4518 (= Frost #1138, 1860 RA 14 48 30, NPD 132 34) is "extremely small, round, also one pretty large, extremely extended 100°". The position precesses to RA 14 57 39.3, Dec -43 08 04, only a third of an arcmin southwest of the western member of the pair of galaxies listed above, and the description of the pair fits perfectly, so the identification is certain. Unfortunately, there are three PGC listings for the pair of galaxies, and sometimes the northwesterly plume extending from the eastern member is mistaken for one of them, so some references give the correct PGC entries (shown above and in the 2.4 arcmin wide image below), and some mix them up in one way or another. (Sometimes only the western galaxy is listed as IC 4518, and the other is considered a separate object; but it is generally thought that given Frost's description, Dreyer meant to include both nebulae in the entry.)
Physical Information: PGC 53466 is about 1.0 by 0.3; it is listed as a Seyfert galaxy (type Sy 2). PGC 53467 is about 1.3 by 0.25 arcmin for the main galaxy, 1.4 by 0.1 arcmin for the northwesterly plume, and 2.2 by 0.25 arcmin overall.

Historical Identification: Per Dreyer, IC 4519 (= Javelle #1349, 1860 RA 14 49 13, NPD 52 00.3) is "faint, small, diffuse, 14th magnitude star to southwest". The position precesses to RA 14 54 44.7, Dec +37 25 30, just over half an arcmin north of the galaxy listed above, so the identification seems certain save for the description of the field, as the nearest star is a 10th magnitude star to the northwest. The error in direction isn't that much of a problem, as visual observers often become confused about directions, since depending upon the observing setup the field of view could be upright, inverted or some combination of the two, but the large error in the brightness of the star seems unusual and bothersome. However, no one else seems to have expressed any doubt about the identification, so it is presumably reasonably certain.
Physical Information: Apparent size 0.9 by 0.5 arcmin.

Historical Identification: Per Dreyer, IC 4520 (= Javelle #1350, 1860 RA 14 49 22, NPD 55 42.5) is "faint, very small, round, nuclear, mottled but not resolved". The position precesses to RA 14 55 06.1, Dec +33 43 20, almost exactly on the galaxy listed above and there is nothing else nearby, so the identification is certain.
Physical Information: Apparent size 0.5 by 0.4 arcmin.

Historical Identification: Per Dreyer, IC 4521 (= Javelle #1351, 1860 RA 14 53 21, NPD 63 52.3) is "faint, considerably small, extended east-west, gradually brighter middle". The position precesses to RA 14 59 28.2, Dec +25 34 07, less than an arcmin south of the galaxy listed above and there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size 0.7 by 0.45 arcmin.

Historical Identification: Per Dreyer, IC 4522 (= DeLisle Stewart #420, 1860 RA 14 55 45, NPD 165 18) is "very faint, very small, considerably brighter middle, star involved". The position precesses to RA 15 11 37.7, Dec -75 50 33, a little over an arcmin north northeast of the galaxy listed above, and there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size 2.7 by 0.8 arcmin.

Historical Identification: Per Dreyer, IC 4523 (= Frost #1139, 1860 RA 14 55 52, NPD 132 58) has a "brighter middle, magnitude 14". The position precesses to RA 15 05 07.0, Dec -43 31 00, on the southwestern rim of the galaxy listed above, and there is nothing else nearby so the identification is certain.
Physical Information: Apparent size 1.7 by 1.6 arcmin.

Historical Identification: Per Dreyer, IC 4524 (= Javelle #1352, 1860 RA 14 55 58, NPD 63 50.9) is "faint, small, irregular figure, gradually brighter middle, mottled but not resolved". The position precesses to RA 15 02 04.4, Dec +25 35 53, less than half an arcmin southwest of the galaxy listed above and there is nothing else nearby, so the identification is certain. (The error in position is essentially the same as for Javelle's #1353 = IC 4525, suggesting that most of the error probably lay in the position of his comparison star.) Unfortunately, despite the certain identification, the entry is sometimes misidentified as PGC 53684 (which see, immediately following).
Physical Information: Apparent size 0.55 by 0.45 arcmin.

Physical Information: Apparent size 0.75 by 0.1 arcmin.

Historical Identification: Per Dreyer, IC 4525 (= Javelle #1353, 1860 RA 14 56 16, NPD 63 48.7) is "very faint, considerably small, diffuse". The position precesses to RA 15 02 22.2, Dec +25 38 08, only about half an arcmin southwest of the galaxy listed above and there is nothing else nearby, so the identification is certain. (The error in position is essentially the same as for Javelle's #1352 = IC 4524, suggesting that most of the error probably lay in the position of his comparison star.)
Physical Information: Apparent size 0.6 by 0.5 arcmin.

Historical Identification: Per Dreyer, IC 4526 (= Javelle #1354, 1860 RA 14 56 26, NPD 66 05.1) is "very faint, very small, nuclear". The position precesses to RA 15 02 38.5, Dec +23 21 46, about 0.7 arcmin due north of the galaxy listed above, and save for the much brighter NGC 5829, which is 1.2 arcmin southeast of IC 4526, there is nothing else nearby, so the identification is certain. Per Thomson, the galaxy is sometimes mistakenly treated as part of NGC 5829, but as discussed below they have no relationship to each other, save for being in nearly the same direction.
Physical Information: IC 4526 and NGC 5829 are listed as Arp 42, an example of a spiral galaxy with a faint companion; however, IC 4526 is over 300 million light years farther away, so they are only an "optical double". Based on a recessional velocity of 13685 km/sec, a straightforward calculation indicates that IC 4526 is about 635 million light years away. However, for such distant objects, we need to 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 605 million light years away when the light by which we see it was emitted, about 620 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 0.65 by 0.55 arcmin, IC 4526 is about 115 thousand light years across.

Historical Identification: Per Dreyer, IC 4527 (= Frost #1140, 1860 RA 14 56 29, NPD 131 54) is "considerably small, extended 225°, brighter middle". The position precesses to RA 15 05 39.7, Dec -42 26 55, practically on top of the galaxy listed above, and the description fits, so the identification is certain.
Physical Information: Apparent size 1.4 by 0.5 arcmin.

Historical Identification: Per Dreyer, IC 4528 (= Bigourdan #423, 1860 RA 14 56 56, NPD 40 21) is "extremely faint, pretty small, diffuse, mottled but not resolved". The position precesses to RA 15 01 32.6, Dec +49 05 49, which is an arcmin south of the galaxy listed above, close enough for a reasonably certain identification; but as it happens, Dreyer's NPD has a typographical error (it should have been 40 20), and precessing Bigourdan's original position instead of the incorrect IC2 position yields a J2000 position of RA 15 01 32.6, Dec +49 06 22, which falls right on the southwestern rim of the galaxy; in addition (per Corwin, relying on Bigourdan's "big" catalog), Bigourdan notes the presence of the 12th magnitude star 2 arcmin to the northwest, making the identification absolutely certain. Despite this, some catalogs have misidentified PGC 53607 (which lies a minute of time to the west and 2.7 arcmin to the north) as IC 4528, so that object is discussed immediately below.
Physical Information: Based on a recessional velocity of 7800 km/sec, a straightforward calculation indicates that IC 4528 is about 365 million light years away. However, for objects at such distances 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 350 million light years away at the time the light by which we see it was emitted, about 355 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 0.75 by 0.55 arcmin, the galaxy is about 80 thousand light years across.

Historical Identification: As noted in the discussion of IC 4528, PGC 53607 is sometimes misidentified as that IC object, despite being nowhere near Bigourdan's position for the object. So placing this entry on this page serves primarily as a warning for those who accidentally rely on the incorrect identification.
Physical Information: Based on a recessional velocity of 9265 km/sec, a straightforward calculation indicates that PGC 53607 is about 430 million light years away. However, for objects at such distances 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 415 million light years away at the time the light by which we see it was emitted, about 425 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 0.9 by 0.2 arcmin, the galaxy is about 110 thousand light years across.

Historical Identification: Per Dreyer, IC 4529 (= Frost #1141, 1860 RA 14 57 04, NPD 132 41) has a "brighter middle, magnitude 14". The position precesses to RA 15 06 18.4, Dec -43 13 50, about 1.4 arcmin west of the galaxy listed above, but there is nothing else nearby and the description fits, so the identification seems reasonably certain. (Note: The closeup image below is not detailed enough to tell whether the "nucleus" is all part of the galaxy, or partly superimposed stars, so the position of the nucleus (which is used as the position of the galaxy, above) may prove slightly different when better pictures are available.)
Physical Information: Apparent size 0.75 by 0.65 arcmin.

Historical Identification: Per Dreyer, IC 4530 (= Javelle #1355, 1860 RA 14 57 41, NPD 63 21.9) is "faint, small, diffuse, 13.5 magnitude star to northeast". The position precesses to RA 15 03 45.5, Dec +26 05 08, less than an arcmin south of the galaxy listed above, and the star to its north northeast makes the identification certain.
Physical Information: Apparent size 1.05 by 0.35 arcmin.

Historical Identification: Per Dreyer, IC 4531 (= Javelle #1356, 1860 RA 14 58 15, NPD 66 03.5) is "faint, very small, round, nuclear". The position precesses to RA 15 04 27.0, Dec +23 23 37, about 1.3 arcmin south of the galaxy listed above, and there is nothing else nearby, so the identification is certain.
Physical Information: Apparent size 0.8 by 0.5 arcmin.

Historical Identification: Per Dreyer, IC 4532 (= Javelle #1357, 1860 RA 14 58 19, NPD 66 14.4) is "very faint, nuclear, stellar". The position precesses to RA 15 04 31.5, Dec +23 12 44, but there is nothing there. However, per Corwin and Thomson, Javelle misidentified his companion star as DM 23 2764 (at J2000 15 04 18.9, Dec +23 09 57), but he must have actually used the star at RA 15 04 42.3, Dec +23 12 42; correcting for that mistake yields a position for IC 4532 of RA 15 04 54.9, Dec +23 15 29, within the northeastern outline of the galaxy listed above, and since the description fits the galaxy and there is nothing else nearby, the identification is certain.
Physical Information: Apparent size 0.75 by 0.45 arcmin.

Historical Identification: Per Dreyer, IC 4533 (= Javelle #1358, 1860 RA 14 58 31, NPD 61 39.8) is "faint, small, irregular figure, 10.5 magnitude star to east". The position precesses to RA 15 04 30.3, Dec +27 47 21, right on the galaxy listed above, and the star to the east northeast makes the identification certain. Per Corwin, IC 4533 may be the otherwise lost NGC 5840 (which see for a discussion of that possibility), but probably is not, hence the title for this entry.
Physical Information: Apparent size 0.95 by 0.75 arcmin.

Historical Identification: Per Dreyer, IC 4534 (= Javelle #1359, 1860 RA 15 01 59, NPD 65 45.4) is "pretty bright, small, extended north-south, nuclear". The position precesses to RA 15 08 09.2, Dec +23 42 16, but there is nothing there nor anywhere near there. However, as in the case of IC 4532, the problem can be solved if we assume that Javelle misidentified his comparison star. Per Corwin and Thomson, there is a perfect candidate for what Javelle saw about 20 arcmin west of the IC2 position. If we convert the modern position of that galaxy to 1860 coordinates and reverse Javelle's offsets from his comparison star (1m 11.7s east, 5' 11.5" south of the star), we find a suitable candidate for Javelle's comparison star at J2000 RA 15 05 30.1, Dec +23 43 36. Presuming that really was Javelle's comparison star, the position of his #1359 would become J2000 RA 15 06 41.7, Dec +23 38 35, right on the galaxy listed above, and it perfectly fits the description, so the identification seems reasonably certain.
Physical Information: Apparent size 1.3 by 0.7 arcmin.

Historical Identification: Per Dreyer, IC 4535 (= Javelle #1360, 1860 RA 15 03 17, NPD 51 53.6) is "faint, small, diffuse, 14th magnitude star to southwest". The position precesses to RA 15 08 41.9, Dec +37 34 12, right on the galaxy listed above, and the star an arcmin to the southwest confirms the identity. (Per Corwin, there was at least one earlier misidentification of the object, but all the databases referred to by Corwin or Thomson now show the correct object or no listing at all, so apparently any previous misidentifications have been corrected; for that reason, there is no supplementary entry for this object.)
Physical Information: Apparent size 0.6 by 0.2 arcmin.

Historical Identification: Per Dreyer, IC 4536 (= Barnard, 1860 RA 15 05 28, NPD 107 36.3) is "very faint, large, round, faint star attached on northwest, faint star near to southeast". The position precesses to RA 15 13 22.7, Dec -18 07 59, only an arcmin east of the galaxy listed above, and the star on the nortwestern rim of the galaxy makes the identification certain.
Physical Information: Apparent size 2.1 by 1.9 arcmin.

Historical Identification: Per Dreyer, IC 4537 (= Barnard, 1860 RA 15 10 22, NPD 87 26.2) is "extremely faint, very small, round, brighter middle". The position precesses to RA 15 17 26.7, Dec +02 02 48, about 1.4 arcmin west of the galaxy listed above, but there is nothing else nearby, so the identification seems certain.
Physical Information: Apparent size 0.65 by 0.25 arcmin.

Historical Identification: Per Dreyer, IC 4538 (= Swift list XI (#178), 1860 RA 15 12 50, NPD 113 10.9) is "most extremely faint, very large". The position precesses to RA 15 21 01.7, Dec -23 41 27, about 3 arcmin southwest of the galaxy listed above, but there is nothing else nearby and it fits the description, so the identification is certain.
Physical Information: Apparent size 2.4 by 2.0 arcmin.

Historical Identification: Per Dreyer, IC 4539 (= Javelle #1361, 1860 RA 15 12 53, NPD 57 06.8) is "faint, small, round, very little brighter middle". The position precesses to RA 15 18 33.0, Dec +32 22 28, just over an arcmin south southeast of the galaxy listed above, but there is nothing else nearby, so the identification is considered certain.
Physical Information: Apparent size 0.4 by 0.4 arcmin.

Historical Identification: Per Dreyer, IC 4540 (= Swift list XI (#177), 1860 RA 15 12 58, NPD 87 42.2) is "very faint, pretty small, much extended, bright star near" (Swift actually wrote "bright star partly obscures it"). The position precesses to RA 15 20 03.3, Dec +01 47 12 (whence the position above), but there no galaxies that Swift could have seen in what is an essentially stellar field, and although a close pair of stars might have been perceived as an extended object by Swift, no pair has been given any significant chance of being what (if anything) Swift thought he saw. Corwin gives a detailed discussion of his exhaustive examination of the field (and its lack of success in turning up any candidates for IC 4540), and a brief discussion of an earlier suggestion by Steinicke that Steinicke has long abandoned as being either wrong or unprovable. So it appears that IC 4540 is definitely lost or nonexistent.

Historical Identification: Per Dreyer, IC 4541 (= DeLisle Stewart #421, 1860 RA 15 16 17, NPD 160 05) is "extremely faint, very small, much extended 150°, suspected". The position precesses to RA 15 30 13.0, Dec -70 34 34, about 1.5 arcmin northeast of the galaxy listed above, and the description fits, so the identification is certain.
Physical Information: Apparent size 2.3 by 0.5 arcmin.

Historical Identification: Per Dreyer, IC 4542 (= Javelle #1362, 1860 RA 15 16 30, NPD 56 19.7) is "faint, small, round, nuclear, 12th magnitude star to southwest". The position precesses to RA 15 22 06.0, Dec +33 10 08, just over an arcmin north of the galaxies listed above, and the star to their west southwest makes the identification certain. The main question is whether to count the fainter component as part of the IC object, as Javelle almost certainly took no notice of it; but the pair are at essentially the same distance and are probably gravitationally interacting, and in such situations it is customary to include both "components" in the listing, as I have done.
Physical Information: The recessional velocity of PGC 54855 is 9480 km/sec, and of PGC 54856 is 9595 km/sec, with an uncertainty of about 50 km/sec for each object. This means that for all practical purposes they share a common recessional velocity of 9535 km/sec, with little if any radial velocity relative to each other. Given that recessional velocity a straightforward calculation indicates that the pair is about 445 million light years away. However, for objects at such distances 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 pair was just under 430 million light years away at the time the light by which we see them was emitted, about 435 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 0.75 by 0.5 arcmin, PGC 54855 is about 95 thousand light years across, and PGC 54856's apparent size of 0.3 by 0.05 arcmin corresponds to about 35 thousand light years.

Historical Identification: Per Dreyer, IC 4543 (= Swift list XI (#179), 1860 RA 15 17 59, NPD 76 01.2) is "extremely faint, pretty small, very faint star near to northwest". The position precesses to RA 15 24 34.1, Dec +13 28 56, about two arcmin west of PGC 3090879, but the description of the field makes it clear that the brighter IC 1118, which has the required star to its northwest, though four and a half arcmin further away, must be what Swift observed (hence the double listing). Unfortunately, PGC 3090879's closer position has led to its often being misidentified as IC 4543, so it is discussed immediately below.
Physical Information: Given the duplicate entry, see IC 1118 for anything else.

Historical Identification: As noted in the entry for IC 4543, that object is a reobservation of IC 1118, but because of PGC 3090879's greater proximity to Swift's position for IC 4543, it is often misidentified as that object. (Note: Listed in NED as 2MASXJ15244226+1328340.)
Physical Information: Based on a recessional velocity of 6930 km/sec, PGC 3090879 is about 320 million light years away. Given that and its apparent size of 0.5 by 0.25 arcmin, it is about 45 thousand light years across.

Historical Identification: Per Dreyer, IC 4544 (= Fleming #71, 1860 RA 15 19 20, NPD 140 06) is "planetary, stellar". The position precesses to RA 15 29 26.0, Dec -50 35 23, which is in a region so full of faint stars that it is impossible to tell which might be Fleming's object. As a result, for a long time IC 4544 was listed as lost. Dreyer placed it in the IC2 because it was in a 1908 Harvard Annals list of newly discovered objects, and the reference in the HA to the "original" paper was incorrect, which would have made it impossible for Dreyer to realize that it was the 1893 nova (if he had he probably would have listed it as such, as it is not the only nova in the NGC/IC). Although the position in the 1908 HA was a bit off, (per Corwin) the variable star observers at Harvard continued to follow its variations, and when they published a precise position it was essentially the same as the modern position (as listed above to 0.1 arcsec accuracy). As shown in the images below, it required exceptionally detailed imaging of the region by Woudt and Warner to identify the particular star that must be the remnant of Nova Normae 1893, and is therefore IC 4544.
Physical Information: Per PASP 53, Fleming discovered the nova in 1893, at which time it reached magnitude 7 (it now erratically varies between magnitudes 18.5 and 19.0). The nova was not visible on a plate of the region taken on Jun 21, 1893, but was visible on the plate taken on July 10, 1893 (and examined by Fleming on Oct 26), so it must have erupted between those two dates.

Historical Identification: Per Dreyer, IC 4545 (= DeLisle Stewart #422, 1860 RA 15 19 28±, NPD 171 11±) is "most extremely faint, extremely small, much extended 145°, between 2 very faint stars, suspected". The position precesses to RA 15 43 06.4, Dec -81 39 17, though with a considerable uncertainty due to the uncertain positions in the IC2. Despite that, it is only 2 arcmin southeast of the galaxy listed above, and the description fits perfectly, so the identification is certain.
Physical Information: Apparent size 2.15 by 0.85 arcmin.

Historical Identification: Per Dreyer, IC 4546 (= Javelle #1363, 1860 RA 15 21 09, NPD 60 39.8) is "faint, very small, round, 13th magnitude star attached". The position precesses to RA 15 26 58.4, Dec +28 50 47, barely below the southern rim of the galaxy listed above, and the star on its northeastern rim confirms the identification. (Per Thomson, there was a typographical error in the second part of Javelle's catalog involving the sign of the offset from Javelle's comparison star, but the first part of the catalog had the correct position, so Dreyer's position was correct, and there has never been any doubt about the identification.)
Physical Information: Apparent size 0.6 by 0.55 arcmin. A starburst galaxy?

Historical Identification: Per Dreyer, IC 4547 (= Javelle #1364, 1860 RA 15 21 25, NPD 60 43.5) is "faint, small, round, nuclear, mottled but not resolved". The position precesses to RA 15 27 14.5, Dec +28 47 07, within the southwestern outline of the galaxy listed above, so the identification is certain.
Physical Information: Apparent size 0.8 by 0.6 arcmin.

Historical Identification: Per Dreyer, IC 4548 (= Javelle #1365, 1860 RA 15 21 34, NPD 60 39.9) is "very faint, small, irregular figure, mottled but not resolved". The position precesses to RA 15 27 23.3, Dec +28 50 45, on the southwestern rim of the galaxy listed above, so the identification is essentially certain.
Physical Information: Apparent size 0.35 by 0.35 arcmin.

Historical Identification: Per Dreyer, IC 4549 (= Javelle #1366, 1860 RA 15 23 39, NPD 56 42.0) is "faint, considerably small, extended east-west". The position precesses to RA 15 29 13.9, Dec +32 48 57, only half an arcmin south of the galaxy listed above, and the description fits, so the identification is certain.
Physical Information: Apparent size 0.8 by 0.3 arcmin.