Historical Identification: Per Dreyer, NGC 6250 (= GC 4252 = JH 3656, 1860 RA 16 47 41, NPD 135 42.4) is "a cluster, large, a little rich, a little compressed, stars from 8th to 12th magnitude".
Physical Information: Apparent size ? arcmin.

Historical Identification: Per Dreyer, NGC 6251 (= GC 4253 = WH III 974, 1860 RA 16 47 55, NPD 07 09.0) is "considerably faint, small, brighter middle, western of 2", the other being NGC 6252. The second IC lists a corrected NPD (per Bigourdan) of 07 14.
Physical Information: Apparent size 1.8 by 1.5? arcmin.

Historical Identification: Per Dreyer, NGC 6252 (= GC 4254 = WH III 975, 1860 RA 16 47 58, NPD 07 06.0) is "very faint, very small, eastern of 2", the other being NGC 6251. The second IC lists a corrected NPD (per Bigourdan) of 07 11.
Physical Information: Apparent size 0.7 by 0.3? arcmin.

Historical Identification: Per Dreyer, NGC 6253 (= GC 4255 = JH 3657, Dunlop 374?, 1860 RA 16 48 03, NPD 142 28.9) is "a cluster, small, triangular, stars of 13th magnitude".
Physical Information: Apparent size 4? arcmin.

Historical Identification: Per Dreyer, NGC 6254 (= GC 4256 = JH 1972 = JH 3659, M 10, 1860 RA 16 49 47, NPD 93 52.7) is "a remarkable object, a globular cluster, bright, very large, round, gradually very much brighter middle, well resolved, clearly consisting of stars, stars from 10th to 15th magnitude".
Physical Information: About 16 thousand light-years away and 70 light-years across. Apparent size 20? arcmin.

Historical Identification: Per Dreyer, NGC 6255 (= GC 4257 = JH 1973 = WH III 689, 1860 RA 16 49 48, NPD 53 16.8) is "extremely faint, considerably large, extended 90°".
Physical Information: Apparent size 3.6 by 1.5? arcmin.

Historical Identification: Per Dreyer, NGC 6256 (= GC 4258 = JH 3658, (Dunlop 554), 1860 RA 16 50 09, NPD 126 53.5) is "a globular cluster, very faint, very large, irregularly round, very gradually brighter middle, well resolved, clearly consisting of stars".
Discovery Notes: Neither Herschel nor Dreyer realized that Dunlop might have observed this object, but it is now thought that it is his #554, hence the credit in parentheses. Physical Information: Apparent size 4.1? arcmin.

Historical Identification: Per Dreyer, NGC 6257 (= GC 4259 = JH 1974, 1860 RA 16 50 12, NPD 50 09.6) is "very faint (very small double star?), faint double star to northeast".
Physical Information: Apparent size 0.8 by 0.2? arcmin.

Historical Identification: Per Dreyer, NGC 6258 (Swift list IV (#44), 1860 RA 16 50 31, NPD 29 14.4) is "extremely faint, very small, round, bright star and double star to west".
Physical Information: Apparent size 0.9 by 0.7? arcmin.

Historical Identification: Per Dreyer, NGC 6259 (= GC 4260 = JH 3660, Dunlop 456, 1860 RA 16 50 37, NPD 134 26.9) is "a remarkable object, a cluster, bright, very large, very rich, stars from 11th magnitude".
Physical Information: Apparent size 15? arcmin.

Historical Identification: Per Dreyer, NGC 6260 (Swift list IV (#45), 1860 RA 16 50 43, NPD 26 03.0) is "extremely faint, pretty small, round, several stars near to southeast".
Physical Information: Apparent size 0.8 by 0.8? arcmin.

Historical Identification: Per Dreyer, NGC 6261 (Stephan list XI (#13), 1860 RA 16 50 56, NPD 61 48.0) is "extremely faint, extremely small, irregular figure".
Physical Information: Apparent size 1.2 by 0.5? arcmin.

Historical Identification: Per Dreyer, NGC 6262 (Swift list V (#72), 1860 RA 16 51 03, NPD 32 51.0) is "most extremely faint, pretty small, round, very difficult".
Physical Information: Apparent size 0.6 by 0.4? arcmin.

Historical Identification: Per Dreyer, NGC 6263 (= GC 5834, Marth #319, Stephan list II (#??), 1860 RA 16 51 11, NPD 61 57.0) is "very faint, very small, round".
Physical Information: Apparent size 0.9 by 0.9? arcmin.

Historical Identification: Per Dreyer, NGC 6264 (= GC 5835, Marth #320, Stephan list II (#??), 1860 RA 16 51 44, NPD 61 55.4) is "extremely faint, very small".
Physical Information: Apparent size 0.7 by 0.4? arcmin.

Historical Identification: Per Dreyer, NGC 6265 (= GC 5836, Marth #321, Stephan list II (#??), 1860 RA 16 51 57, NPD 61 55.9) is "extremely faint, very small".
Physical Information: Apparent size 0.8 by 0.5? arcmin.

Historical Identification: Per Dreyer, NGC 6266 (= GC 4261 = JH 3661, M 62, Dunlop 627, 1860 RA 16 52 19, NPD 119 53.8) is "a remarkable object, a globular cluster, very bright, large, gradually much brighter middle, well resolved, clearly consisting of stars, stars of 14th to 16th magnitude".
Physical Information: Apparent size 15? arcmin.

Historical Identification: Per Dreyer, NGC 6267 (= GC 4262 = WH III 123, 1860 RA 16 52 22, NPD 66 46.9) is "very faint, pretty large, round, a little brighter middle".
Physical Information: Apparent size 1.3 by 1.0? arcmin.

Historical Identification: Per Dreyer, NGC 6268 (= GC 4263 = JH 3662, Dunlop 521, 1860 RA 16 52 26, NPD 129 30.8) is "a cluster, bright, pretty large, considerably rich, stars from 10th magnitude".
Physical Information: Apparent size 6? arcmin.

Historical Identification: Per Dreyer, NGC 6269 (= GC 5837, Marth #322, Stephan list II (#??), 1860 RA 16 52 26, NPD 61 55.3) is "faint, small, round".
Physical Information: Apparent size 2.0 by 1.6? arcmin.

Historical Identification: Per Dreyer, NGC 6270 (= GC 5838, Marth #323, Stephan list II (#??), 1860 RA 16 53 12, NPD 61 55.2) is "extremely faint, small, round".
Physical Information: Apparent size 0.7 by 0.4? arcmin.

Historical Identification: Per Dreyer, NGC 6271 (= GC 5839, Marth #324, 1860 RA 16 53 18, NPD 61 49) is "very faint, round".
Physical Information: Apparent size 0.8 by 0.6? arcmin.

Historical Identification: Per Dreyer, NGC 6272 (= GC 5840, Marth #325, 1860 RA 16 53 26, NPD 61 52) is "very faint".
Physical Information: Apparent size 0.5 by 0.3? arcmin.

Historical Identification: Per Dreyer, NGC 6273 (= GC 4264 = JH 1975 = JH 3663, M 19, 1860 RA 16 53 59, NPD 116 03.2) is "a globular cluster, very bright, large, round, very compressed middle, well resolved, clearly consisting of stars, stars of 16th magnitude".
Physical Information: About 28 thousand light-years from the Earth, but only 5 thousand light-years from the center of our Galaxy, as it lies almost directly in line with the center from our point of view. Like most globular clusters, M19's stars are all about 13 billion years old. Apparent size 17 arcmin.

Historical Identification: Per Dreyer, NGC 6274 (= GC 5841, Marth #326, 1860 RA 16 54 08, NPD 60 02) is "extremely faint, very small".
Physical Information: Apparent size 0.6 by 0.4? arcmin. (Steinicke inadvertently reversed the PGC designations for the pair.)

Physical Information: Apparent size 0.6 by 0.2? arcmin. Recessional velocity essentially the same as for NGC 6274 (which see for images), so the two are probably physical companions; however, one must be a little in front of the other, as they do not show signs of distortion corresponding to a very close interaction or collision. (Note: Steinicke inadvertently reversed the PGC designations for the pair.)

Historical Identification: Per Dreyer, NGC 6275 (Swift list IV (#46), 1860 RA 16 54 12, NPD 26 32.4) is "most extremely faint, small, a little extended, very difficult".
Physical Information: Apparent size 0.45 by 0.4 arcmin

Historical Identification: Per Dreyer, NGC 6276 (= GC 5842, Marth #327, Stephan list II (#??), 1860 RA 16 54 52, NPD 66 44.9) is "extremely faint".
Physical Information: Apparent size 0.4 by 0.3? arcmin

Historical Identification: Per Dreyer, NGC 6277 (= GC 5843, Marth #328, Stephan list II (#??), 1860 RA 16 54 56, NPD 66 45.2) is "extremely faint".

Historical Identification: Per Dreyer, NGC 6278 (= GC 4266 = WH III 124, Stephan list II (#??), 1860 RA 16 54 58, NPD 66 46.8) is "very faint, stellar".
Physical Information: Apparent size 2.1 by 1.2? arcmin

Historical Identification: Per Dreyer, NGC 6279 (Swift list V (#73), 1860 RA 16 55 03, NPD 42 32.7) is "very faint, pretty small, a little extended, coarse double star to northwest".
Physical Information: Apparent size 1.1 by 0.9? arcmin

Historical Identification: Per Dreyer, NGC 6280 (= GC 5844, Marth #329, 1860 RA 16 55 10, NPD 83 07) is "pretty bright, small, a little extended".
Physical Information: PGC 59464 apparent size 0.5 by 0.3 arcmin. PGC 1305241 apparent size 0.2 by 0.2 arcmin.

Historical Identification: Per Dreyer, NGC 6281 (= GC 4265 = JH 3664, Dunlop 556, 1860 RA 16 55 16, NPD 127 40.9) is "a cluster, large, pretty rich, a little compressed, stars from 9th to 11th magnitude".
Physical Information: Apparent size 8? arcmin

Historical Identification: Per Dreyer, NGC 6282 (= GC 5845, Marth #330, 1860 RA 16 55 21, NPD 59 58) is "very faint, small, round".
Physical Information: Apparent size 0.7 by 0.5? arcmin

Historical Identification: Per Dreyer, NGC 6283 (= GC 4267 = WH III 728, 1860 RA 16 55 53, NPD 39 51.6) is "very faint, considerably small, irregularly round".
Physical Information: Apparent size 1.1 by 1.1? arcmin

Historical Identification: Per Dreyer, NGC 6284 (= GC 4268 = JH 1976 = JH 3665 = WH VI 11, 1860 RA 16 55 56, NPD 114 33.8) is "a globular cluster, bright, large, round, compressed middle, well resolved, clearly consisting of stars, stars from 16th magnitude".
Physical Information: Apparent size 6.2? arcmin

Historical Identification: Per Dreyer, NGC 6285 (Swift list VI (omitted), 1860 RA 16 56 07, NPD 30 48.8) is "most extremely faint, small, round, very difficult, north-preceding (northwestern) of 2", the other being NGC 6286. The position precesses to RA 16 58 16.6, Dec +58 58 33, about 1.5 arcmin northwest of the galaxy listed above, the description fits and there is nothing else nearby other than the supposed companion to its southeast, which is accounted for by NGC 6286, and helps verify the description, so the identification is certain.
Discovery Notes: This is one of a number of objects included in a pre-publication list sent to Dreyer in 1887 that were inadvertently left out of Swift's list VI. For most of them, the error of omission was corrected by including them in Swift's list IX, but the lack of a number (indicated by omitted) indicates that this object was not included in either published list. Corwin states that (per Gary Kronk) there are six objects discovered by Swift that only appear in the NGC: the others are NGC 5783, 6346, 6612, 7759 and 7780. NGC 1207 and 1360 did appear in papers published by Swift, but only the reference for NGC 1360 is currently known (Sidereal Messenger, Volume 4, page 36 (see page 39), 1885).
Arp Atlas Usage: Arp 293 is used by the Arp Atlas as an example of galaxies with the appearance of wind effects. Arp's note about the pair states that there is a diffuse arc southeast of the brighter galaxy (which lies outside the HST image, but is shown in the Mount Lemmon SkyCenter image).
Physical Information: Since there is no doubt that NGC 6285 and 6286 are a physically interacting pair, the best value to use for their recessional velocity is the average of their individual values. For NGC 6285, the recessional velocity relative to the Costmic Microwave Background is 5665 km/sec, while for NGC 6286, the similar value is 5475 km/sec, yielding an average of 5570 km/sec. Based on that recessional velocity (and H₀ = 70 km/sec/Mpc), NGC 6285 and 6286 are about 260 million light-years away. Given that and its apparent size of about 0.85 by 0.5 arcmin (from the images below), NGC 6285 is about 65 thousand light-years across. Thanks to its interaction with NGC 6286, both galaxies are surrounded by clouds of gas and stars, stretching from southeast of NGC 6286, between the two galaxies, then around and well to the north of NGC 6285, spanning at least 3.15 arcmin (or 245 thousand light-years) and definitely exhibiting the so-called "wind effects" associated with Arp 293.

Historical Identification: Per Dreyer, NGC 6286 (Swift list II (#45), 1860 RA 16 56 17, NPD 30 51.0) is "extremely faint, pretty small, round". The position precesses to RA 16 58 27.0, Dec +58 56 23, about 0.6 arcmin west-northwest of the galaxy listed above, the description is reasonable for a 140 year-old visual observation with a wide field of view, and the only other nearby object is accounted for by Swift's observation of what Dreyer listed as the "north-preceding of 2" (namely NGC 6285), so the identification is certain.
Arp Atlas Usage: Arp 293 is used by the Arp Atlas as an example of galaxies with the appearance of wind effects. Arp's note about the pair states that there is a diffuse arc southeast of the brighter galaxy (which lies outside the HST image, but is shown in the Mount Lemmon SkyCenter image).
Physical Information: As discussed in the entry for NGC 6285, it and NGC 6286 must be about 260 million light-years away. Given that and its apparent size of about 1.2 by 0.35 arcmin for the main galaxy and about 1.3 by 1.1 arcmin for the diffuse regions immediately surrounding it (from the images below), NGC 6286 is about 90 thousand light-years across, the diffuse region surrounding it spans about 95 to 100 thousand light-years, and the diffuse region surrounding it and its companion spans (as noted in the entry for NGC 6285) at least 245 thousand light-years. NGC 6286 exhibits strong emission lines in its spectrum, presumably due to gases heated by regions of intense star formation, and as a result is referred to as an H II object, and a LINER galaxy.

Historical Identification: Per Dreyer, NGC 6287 (= GC 4269 = JH 3666 = WH II 195, 1860 RA 16 56 44, NPD 112 30.6) is "a globular cluster, considerably bright, large, round, gradually pretty much compressed middle, well resolved, clearly consisting of stars, stars from 16th magnitude".
Physical Information: Apparent size 4.8? arcmin

Historical Identification: Per Dreyer, NGC 6288 (Swift list I (#52), 1860 RA 16 58 05, NPD 21 19.8) is "extremely faint, very small, round, southwestern of 2", the other being NGC 6289.
Physical Information: Apparent size 0.8 by 0.4? arcmin

Historical Identification: Per Dreyer, NGC 6289 (Swift list I (#53), 1860 RA 16 58 36, NPD 21 17.8) is "extremely faint, pretty large, much extended, northeastern of 2", the other being NGC 6288.
Physical Information: Apparent size 0.8 by 0.6? arcmin

Historical Identification: Per Dreyer, NGC 6290 (Swift list II (#46), 1860 RA 16 58 37, NPD 30 49.6) is "extremely faint, pretty small, round, star close following (to the east)." The position precesses to RA 17 00 15.8, Dec +58 58 14, but though there is nothing there, the galaxy listed above lies only 40 seconds of time to the east, and although the NGC description of the field is odd (as there is no obvious "star near following"), Swift's paper reads "star near following; 2 bright stars nearly point to it. Northern of 2," the "southern of 2" undoubtedly being Swift's II #47, found on the same night, which became NGC 6291, and the two bright stars to the northwest being the ones that "nearly point to it". Given that additional information, the identification of both NGC objects must be considered absolutely certain.
Discovery Note: Gottlieb also mentions the two bright stars to the northwest, and confirms the absence of any obvious "star near following".
Warning About Misidentifications: In his entry for NGC 6291, Gottlieb notes that MCG failed to identify NGC 6921 as an NGC object, and per a private communication writes that as a result the original PGC misidentified NGC 6290 as NGC 6291, and NGC 6291 as PGC 59433, which is actually the background galaxy to the southwest of NGC 6921. HyperLEDA has corrected these errors, but it is inevitable that they will crop up somewhere or other at some time in the future, hence the need for this warning.
Interaction With NGC 6291: The recessional velocities of NGC 6290 and 6291 are nearly identical, meaning that they are at essentially the same distance from us, and given their apparent proximity and the peculiar appearance of NGC 6290, they are certainly a physical pair, and have probably had a relatively recent gravitational interaction.
Physical Information: As part of an interacting pair of galaxies, the best way to estimate the distance of the pair is to use an average of all distance estimates. In this case neither has any redshift-independent distance estimates, but NGC 6290 has a recessional velocity relative to the Cosmic Microwave Background radiation of just under 5150 km/sec, and NGC 6291 has a velocity of almost 5165 km/sec. Using the average recessional velocity of about 5155 km/sec (and H₀ = 70 km/sec/Mpc), the pair is about 240 million light-years away. Given that and its apparent size of about 1.05 by 0.95 arcmin (from the images below), NGC 6290 is about 70 to 75 thousand light-years across.
Classification Note: Both LEDA and NED list this as a type SBa spiral, but the images below show that it is anything but a typical spiral. Based on those images, the galaxy could be classified as an (R')SB(s)ab? pec spiral, or as a (R')SB(s)0/a? pec lenticular galaxy. I have asked for an expert opinion, but in the meantime, have chosen to use the former classification on a temporary basis.

Physical Information: LEDA, NED, SIMBAD, GAIA and 2MASS all fail to acknowledge the existence of this galaxy, so odds are that there is no information available for it, other than the little shown here, namely the estimates of its magnitude, classification, and apparent size (about 0.45 by 0.1 arcmin, from the image below). Since nothing is known of its distance, its physical size cannot be determined, or for that matter, whether it is actually a companion of NGC 6290, or merely a foreground or background galaxy.
Classification Note: Per Corwin, the g-band PanSTARRS image shows faint star-forming regions, particularly on the northeastern side of the galaxy, but as a nearly edge-on galaxy ("sp" = spindle), an exact classification is difficult, hence the colon after the "m" sub-class. It has a low luminosity class (IV-V), making it too faint to be bothered with by any of the catalogs listed above; so I estimated its brightness by comparison with other faint galaxies, most of which are also ignored by those catalogs, so the magnitude might be better served by two question marks.

Historical Identification: Per Dreyer, NGC 6291 (Swift list II (#47), 1860 RA 16 58 37, NPD 30 51.6) is "most extremely faint, extremely small, round." The position precesses to RA 17 00 46.2, Dec +58 56 14, but although there is nothing there, the galaxy listed above lies only 14 seconds of time to the east, fits the description, and as in the case of Swift II #46 (= NGC 6290), Swift's paper includes additional information, namely "southern of 2," which makes the identification of both NGC objects absolutely certain.
Discovery Note: Although NGC 6291 lies due south of NGC 6290, Swift's position puts it about 30 seconds of time to the east of the other galaxy. His right ascensions were often more than a bit off, but in this case it seems possible that there was a half-minute error in reading the right ascension circle, as well as any other errors associated with the inconvenient way in which he read the circle (observing objects from the top of a ladder, then climbing down the ladder to read the position, since he usually worked without any assistance).
Interaction With NGC 6290: The recessional velocities of NGC 6290 and 6291 are nearly identical, meaning that they are at essentially the same distance from us, and given their apparent proximity and the peculiar appearance of NGC 6290, they are certainly a physical pair, and have probably had a relatively recent gravitational interaction.
Warning About Misidentifications: In his entry for NGC 6291, Gottlieb notes that MCG failed to identify NGC 6921 as an NGC object, and per a private communication writes that as a result the original PGC misidentified NGC 6290 as NGC 6291, and NGC 6291 as PGC 59433, which is actually the background galaxy to the southwest of NGC 6921. HyperLEDA has corrected these errors, but it is inevitable that they will crop up somewhere or other at some time in the future, hence the need for this warning.
Physical Information: As discussed in the entry for NGC 6290, it and NGC 6291 are about 240 million light-years away. Given that and its apparent size of about 0.55 by 0.5 arcmin (from the images below), NGC 6291 is about 35 to 40 thousand light-years across.

Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 8915 km/sec (and H₀ = 70 km/sec/Mpc), a straightforward calculation indicates that PGC 59433 is about 415 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 380 to 385 million light-years away at the time the light by which we see it was emitted, about 390 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 about 0.6 by 0.45 arcmin (from the images below), the galaxy is about 65 thousand light-years across.
Relationship to NGC 6921: Given its much larger recessional velocity, PGC 59433 is not an actual compmanion of NGC 6921, but only a much more distant background galaxy.

Historical Identification: Per Dreyer, NGC 6292 (Swift list II (#48), 1860 RA 17 00 52, NPD 28 45.8) is "extremely faint, extended, very difficult, faint star near". The second IC lists a corrected RA (per Bigourdan) of 17 01 19.
Physical Information: Apparent size 1.6 by 0.8? arcmin

Historical Identification: Per Dreyer, NGC 6293 (= GC 4270 = JH 1977 = JH 3667 = WH VI 12, 1860 RA 17 01 28, NPD 116 23.2) is "a globular cluster, very bright, large, round, pretty suddenly brighter middle, well resolved, clearly consisting of stars, stars from 16th magnitude".
Physical Information: Apparent size 8.2? arcmin

Historical Identification: Per Dreyer, NGC 6394 (= GC 4271 = JH 1978, 1860 RA 17 01 34, NPD 116 22.6) is "faint, small, very gradually brighter middle, globular cluster to west", the globular cluster being NGC 6293. The second IC adds "Only a double star 13th and 13.5 magnitude, distance 8 arcsec (Howe). h. has only one observation at Slough".

Historical Identification: Per Dreyer, NGC 6295 (Swift list IV (#47), 1860 RA 17 01 36, NPD 29 25.6) is "extremely faint, small, much extended, faint star near".
Physical Information: Apparent size 0.9 by 0.4? arcmin

Historical Identification: Per Dreyer, NGC 6296 (= GC 5846, Marth #331, 1860 RA 17 01 46, NPD 85 53) is "pretty bright".
Physical Information: Apparent size 0.9 by 0.7? arcmin

Historical Identification: Per Dreyer, NGC 6297 (Swift list II (#49), 1860 RA 17 01 50, NPD 27 46.8) is "pretty bright, pretty small, round, between 2 stars, western of 2", the other being NGC 6298. The second IC lists a corrected RA (per Bigourdan) of 17 02 09.
Physical Information: Apparent size 0.7 by 0.5? arcmin

Historical Identification: Per Dreyer, NGC 6298 (Swift list II (#50), 1860 RA 17 01 55, NPD 27 46.8) is "very faint, extremely small, round, between 2 stars, eastern of 2", the other being NGC 6297 (which is actually the same object, this being a duplicate entry, so Dreyer's presumption that there was a western or eastern of 2 was incorrect).
Physical Information: Given the duplicate entry, see NGC 6297 for anything else.

Historical Identification: Per Dreyer, NGC 6299 (= GC 4272, d'Arrest, 1860 RA 17 03 39, NPD 27 21.9) is "very faint, very small, round".
Physical Information: Apparent size 0.6 by 0.6? arcmin