Historical Identification: Per Dreyer, NGC 2750 (= GC 1756 = WH III 291, d'Arrest, 1860 RA 08 57 35, NPD 64 00.5) is "very faint, considerably large, brighter middle and nucleus, 2 considerable stars to west". The position precesses to RA 09 05 48.5, Dec +25 26 11, nearly dead center on the galaxy listed above, there is nothing comparable nearby, the description fits and d'Arrest's paper also notes the position of the bright star to the southwest, so the identification is certain. (The use of "2 c *" by John Herschel and Dreyer to describe the stars to the west is unusual, but (per Corwin) is confirmed by reference to WH's original notes.)
Physical Information: Based on a recessional velocity of 2675 km/sec, NGC 2750 is about 125 million light years away, in perfect agreement with a redshift-independent distance estimate of 125 million light years. Given that and its apparent size of 2.2 by 1.9 arcmin, it is about 80 thousand light years across.

Historical Identification: Per Dreyer, NGC 2751 (= GC 5456, Marth #148, 1860 RA 08 57 40, NPD 71 11) is "extremely faint, extremely small, stellar".
Physical Information: Apparent size 0.8 by 0.7 arcmin

Historical Identification: Per Dreyer, NGC 2752 (= GC 5457, Marth #149, 1860 RA 08 57 48, NPD 71 07) is "pretty faint, pretty large, very much extended, gradually brighter middle".
Physical Information: Apparent size 1.8 by 0.4 arcmin

Historical Identification: Per Dreyer, NGC 2753 (= GC 1757, d'Arrest, 1860 RA 08 57 55, NPD 64 06.2) is "very faint, very small, 14th magnitude star 40 arcsec to northwest".
Physical Information: NGC 2753 is listed as a pair of elliptical galaxies in most references, and in lower-resolution images does look like a brighter slightly southwestern object and a fainter slightly northeastern object, so poorly resolved that they could well be ellipticals; but as the images below show it is actually a barred spiral with barely noticeable somewhat ringlike arms. Based on a recessional velocity of 2785 km/sec, NGC 2753 is about 130 million light years away. Given that and its apparent size of 0.6 by 0.45 arcmin, it is about 25 thousand light years across, making it a dwarf galaxy.

Historical Identification: Per Dreyer, NGC 2754 (Muller list II (#408), 1860 RA 08 58 44, NPD 108 31.9) is "extremely faint, small, round, 1st of 3", the others being NGC 2757 and 2758.
Physical Information: Apparent size 0.8 by 0.5 arcmin

Historical Identification: Per Dreyer, NGC 2755 (= GC 1758 = WH III 626, 1860 RA 08 58 52, NPD 47 44.5) is "very faint, small, irregular figure, a little brighter middle, mottled but not resolved".
Physical Information: Apparent size 1.2 by 0.8 arcmin

Historical Identification: Per Dreyer, NGC 2756 (= GC 1759 = JH 553 = WH II 828, 1860 RA 08 58 52, NPD 35 35.4) is "pretty bright, pretty small, extended, very gradually brighter middle".
Physical Information: Apparent size 1.7 by 1.2 arcmin

Historical Identification: Per Dreyer, NGC 2757 (Muller list II (#409), 1860 RA 08 59 08, NPD 108 28.9) is "extremely faint, 2nd of 3, perhaps a star", others "of 3" being NGC 2754 and 2758. The second IC notes (per Howe) "is only an extremely faint double star, distance 12 arcsec" (distance meaning separation). The position precesses to RA 09 05 33.8, Dec -19 02 19, about 0.6 arcmin northeast of NGC 2758, but that galaxy obviously can't be NGC 2757, because the description is completely different. The key to the identification of NGC 2757 must be its description, which suggests that it is a star or very small group of stars, and the fact that Muller places it 6 seconds of time west of NGC 2758. Based on the idea that NGC 2757 must be something to the west of the galaxy, Howe chose the magnitude 14.9 and 15.2 pair of stars about 8 seconds to the west of NGC 2758, but (per Corwin), since Howe was able to see that pair as a double star with only a 16 inch telescope, Muller's 26 inch telescope would certainly have seen that wide a pair as two separate stars, and believes that since Muller couldn't tell that what he saw was a pair of stars, Howe's pair cannot be NGC 2757. Instead, the closer "pair" listed above, which lies 5 seconds of time to the west of NGC 2758, seems a far more likely (and in terms of position, more accurate) choice for what he recorded. In fact, Corwin notes that this triplet was picked up as a single non-stellar object by the Guide Star Catalogue software, so it actually fits Muller's description quite well. Based on this, the triple star listed above is almost certainly NGC 2757.
Physical Information: As noted above, the southern member of the triplet is magnitude 15.3, while the northern pair is magnitude 13.8; but at the moment I haven't been able to find separate magnitudes for either member of the northern pair. However, since the purpose of the NGC was to catalog nebulae and clusters of stars, it really makes no difference.

Historical Identification: Per Dreyer, NGC 2758 (Muller list II (#410), 1860 RA 08 59 14, NPD 108 28.9) is "extremely faint, small, extended 0°, 3rd of 3", the others being NGC 2754 and 2757. The position precesses to RA 09 05 39.8, Dec -19 02 19, just over 2 arcmin east northeast of the galaxy listed above, the description is a reasonably good fit and there is nothing comparable nearby, so the identification is certain.
Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 2270 km/sec (and H₀ = 70 km/sec/Mpc), NGC 2758 is about 105 million light years away, in good agreement with redshift-independent distance estimates of about 75 to 125 million light years. Given that and its apparent size of about 2.05 by 0.5 arcmin (from the images below), the galaxy is about 60 to 65 thousand light years across.

Note About Designation: LEDA and SIMBAD list this galaxy as PGC 860667 and LEDA 860667 respectively, but NED does not list it under any designation, nor does it have any information about the galaxy.
Physical Information: Save for its magnitude and position, there is no information about this galaxy in any reference I can find, though the HST press release states that it is a dwarf companion of NGC 2758, hence the entry posted here. Presuming that it is at about the same distance as its apparent companion (that is, about 105 million light years from us), its apparent size of about 0.28 by 0.16 arcmin (from the images below) would correspond to about 8 or 9 thousand light years.

Historical Identification: Per Dreyer, NGC 2759 (= GC 1760 = JH 554 = WH III 647, 1860 RA 08 59 33, NPD 51 48.7) is "very faint, considerably small, round".
Physical Information: Apparent size 1.0 by 0.7 arcmin

Historical Identification: Per Dreyer, NGC 2760 (Swift list VI (#34), 1860 RA 08 59 33, NPD 13 03.0) is "very faint, small, round, nearly between stars of 8th and 9th magnitude". The position precesses to RA 09 15 42.5, Dec +76 22 50 (whence the position above), but there is nothing there nor near there, and although the position does lie between two stars, they are 13th magnitude, far too faint to be what Swift claimed to observe. As a result of this and the discussion below, NGC 2760 is probably lost or nonexistent, as noted above.
Possible But Questionable Identifications: At one time Corwin suggested that Swift might have observed PGC 26654, but has since rejected the idea because the stars flanking it are also too faint to be what Swift observed, and the galaxy almost certainly has too low a surface brightness to have been observed by Swift's wide-field, low-power equipment. However, this is the object listed as NGC 2760 in NED (albeit with a caveat), so it is discussed in the second entry below. At the current time, Corwin favors (though again with some trepidation) that Swift might have observed PGC 26035, because though well away from his listed position, it is among the closest objects to that incorrect value, has just enough surface brightness to have been observable by Swift, and though the two stars flanking it are still a bit on the faint side and fairly far apart, they would have been visible in Swift's 33-arcmin wide field of view; so it is discussed in the first entry below. However, since neither galaxy can be certainly identified with NGC 2760, this entry will continue to maintain that it is lost or nonexistent.

Historical "Identification": As noted in the entry for NGC 2760, this is considered a possible (though very uncertain) candidate for what Swift misrecorded and Dreyer used as NGC 2760. Whether it really is Swift's object will probably never be known, but it is considered here, simply because it may be noted as that NGC object in one place or another.
Physical Information:

Historical "Identification": As noted in the entry for NGC 2760 this was once suggested as NGC 2760, and although that now seems very unlikely, it is still listed as such in some places, so it is discussed here more as a warning than anything else.
Physical Information:

Historical Identification: Per Dreyer, NGC 2761 (= GC 5458, Marth #150, 1860 RA 08 59 37, NPD 71 01) is "very faint, small".
Physical Information: Apparent size 0.6 by 0.4 arcmin

Historical Identification: Per Dreyer, NGC 2762 (= GC 1767, 3rd Lord Rosse, 1860 RA 09 00 12, NPD 39 01.4) is "very very faint, small, round, 1st of 4", the others being NGC 2767, 2769 and 2771.
Discovery Notes: Although Dreyer credits the discovery to William Parsons, 3rd Earl of Rosse, he notes that many of Rosse's nebular discoveries were actually made by one of his assistants, in this case Bindon Stoney.
Physical Information: Apparent size 0.3 by 0.2 arcmin

Historical Identification: Per Dreyer, NGC 2763 (= GC 1761 = JH 560 = WH III 275, 1860 RA 09 00 14, NPD 104 56.4) is "very faint, pretty small, brighter middle, small (faint) star 30 arcsec to north".
Physical Information: Apparent size 2.3 by 2.0 arcmin

Historical Identification: Per Dreyer, NGC 2764 (= GC 1762 = JH 557 = WH III 236, 1860 RA 09 00 15, NPD 67 59.8) is "considerably faint, very small, round, extremely mottled but not resolved, between 2 pretty bright stars".
Physical Information: Apparent size 1.5 by 1.0 arcmin

Historical Identification: Per Dreyer, NGC 2765 (= GC 1763 = JH 558 = WH II 520, 1860 RA 09 00 17, NPD 86 02.6) is "very faint, pretty large, extended, gradually brighter middle, extremely mottled but not resolved".
Physical Information: Apparent size 2.1 by 1.1 arcmin

Historical Identification: Per Dreyer, NGC 2766 (Stephan list XIII (#44), 1860 RA 09 00 23, NPD 59 34.5) is "very faint, very small, irregular figure, brighter middle".
Physical Information: Apparent size 1.4 by 0.5 arcmin

Historical Identification: Per Dreyer, NGC 2767 (= GC 1764 = JH 556, 1860 RA 09 00 29, NPD 39 02.1) is "very faint, suddenly brighter middle equal to 15th magnitude star, 2nd of 4", the others being NGC 2762, 2769 and 2771.
Physical Information: Apparent size 0.9 by 0.7 arcmin

Historical Identification: Per Dreyer, NGC 2768 (= GC 1765 = JH 555 = WH I 250, 1860 RA 09 00 42, NPD 29 23.4) is "considerably bright, considerably large, a little extended, pretty suddenly brighter middle and large bright nucleus".
Physical Information: Apparent size 6.4 by 3.0 arcmin. Used by the de Vaucouleurs Atlas of Galaxies as an example of galaxy type SA0^-.

Historical Identification: Per Dreyer, NGC 2769 (= GC 1766 = JH 559, 1860 RA 09 00 48, NPD 39 00.4) is "pretty faint, small, extended, pretty suddenly a little brighter middle, 3rd of 4", the others being NGC 2762, 2767 and 2771.
Physical Information: Apparent size 1.8 by 0.4 arcmin

Historical Identification: Per Dreyer, NGC 2770 (= GC 1768 = JH 562 = WH II 490, 1860 RA 09 00 57, NPD 56 18.4) is "faint, large, much extended 150°, mottled but not resolved, 2 stars to north". The position precesses to RA 09 09 32.5, Dec +33 07 47, well within the northern half of the galaxy listed above, the description fits and there is nothing else nearby, so the identification is certain.
Discovery Note: Bindon Stoney's observation is noted above only because (using Lord Rosse's 72-inch "Leviathan") he felt able to see a "long ray" and a "bright streak down the middle", which may have been related to the bright spiral arm on the forward (western) side of the galaxy.
Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background of 2190 km/sec (and H₀ = 70 km/sec/Mpc), NGC 2770 is about 100 to 105 million light years away, in good agreement with redshift-independent distance estimates of about 55 to 120 million light years. Given that and its apparent size of about 3.7 by 0.9 arcmin (from the images below), it is about 110 thousand light years across.

Warning About Non-Standard Designations: As is not unusual in the case of the non-standard usage that adds a letter to an NGC designation, this object has two different "NGC" designations; and is a good example of why, although such non-standard designations are common, they should never be used.
Physical Information: Based on a recessional velocity of 1850 km/sec, PGC 25769 is about 85 million light years away. Given that and its apparent size of 0.7 by 0.4 arcmin, it is about 18 thousand light years across; so it could be classified as a dwarf irregular.

Historical Identification: Per Dreyer, NGC 2771 (= GC 1769 = JH 561, 1860 RA 09 01 00, NPD 39 04.4) is "very faint, small, a little extended, 4th of 4", the others being NGC 2762, 2767 and 2769.
Physical Information: Apparent size 2.3 by 1.9 arcmin

Historical Identification: Per Dreyer, NGC 2772 (= GC 1770 = JH 3146, 1860 RA 09 01 28, NPD 113 05.3) is "extremely faint, a little extended, a little brighter middle".
Physical Information: Possibly (probably?) interacting with the small galaxy to its west, which might explain its peculiar structure. Apparent size 1.5 by 0.5 arcmin?

Historical Identification: Per Dreyer, NGC 2773 (= GC 5459, Marth #151, 1860 RA 09 02 18, NPD 82 15) is "very faint, small, a little extended".
Physical Information: Apparent size 0.7 by 0.3 arcmin

Historical Identification: Per Dreyer, NGC 2774 (= GC 1773 = JH 565 = WH III 61, d'Arrest, Stephan list IX (#19), 1860 RA 09 02 46, NPD 70 44.2) is "very faint, small, round, among 5 small (faint) stars".
Physical Information: Apparent size 0.9 by 0.9 arcmin

Historical Identification: Per Dreyer, NGC 2775 (= GC 1771 = JH 564 = WH I 2, 1860 RA 09 02 53, NPD 82 23.6) is "considerably bright, considerably large, round, very gradually then very suddenly much brighter middle, mottled but not resolved". The position precesses to RA 09 10 19.8, Dec +07 02 23, nearly dead center on the galaxy listed above, the description fits and there is nothing else nearby, so the identification is certain.
Physical Information: NGC 2775 is a perfect example of an unusual type of spiral characterized by a large, perfectly smooth central bulge, an extended relatively smooth disc characteristic of a lenticular galaxy, and an extremely complex ("flocculent") multi-armed spiral structure lying between the two regions. The spiral structure must be home to a very large number of massive stars, as the galaxy has averaged nearly two supernova events per decade over the last 30 years. Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 1660 km/sec (and H₀ = 70 km/sec/Mpc), the galaxy is about 75 to 80 million light years away, in relatively poor agreement with redshift-independent distance estimates of about 45 to 55 million light years (though the HST press release uses a more similar value of 67 million light years). Given that and its overall apparent size of about 4.75 by 3.55 arcmin (from the images below), it is about 105 to 110 thousand light years across (counting the extended smooth external disc noted at the start).
Classification Note: In most respects there is nothing peculiar about the galaxy, but as noted above, its structure is unusual when compared to typical spiral galaxies, in that it combines features seen in such spirals with those usually seen in lenticular galaxies. That is the only reason for my addition of "pec" to its type in the description line.

Historical Identification: Per Dreyer, NGC 2776 (= GC 1772 = JH 563, 1860 RA 09 02 56, NPD 44 28.3) is "pretty bright, large, round, very gradually brighter middle, mottled but not resolved".
Physical Information: Apparent size 2.8 by 2.5 arcmin?

Historical Identification: Per Dreyer, NGC 2777 (= GC 5460, Marth #152, 1860 RA 09 03 16, NPD 82 13) is "faint, small".
Physical Information: Apparent size 0.7 by 0.6 arcmin?

Historical Identification: Per Dreyer, NGC 2778 (= GC 1774 = JH 566 = WH II 564, 1860 RA 09 03 44, NPD 54 24.2) is "pretty bright, small, round, pretty suddenly much brighter middle".
Physical Information: Apparent size 1.4 by 1.0 arcmin? Not far from and possibly a physical companion of NGC 2779.

Historical Identification: Per Dreyer, NGC 2779 (= GC 1775, 3rd Lord Rosse, 1860 RA 09 03 48, NPD 54 22.7) is "extremely faint, very small, 92 arcsec northeast of h 566", (JH) 566 being NGC 2778.
Discovery Notes: Although Dreyer credits the discovery to William Parsons, 3rd Earl of Rosse, he notes that many of Rosse's nebular discoveries were actually made by one of his assistants, in this case George Stoney.
Physical Information: Apparent size 0.7 by 0.6 arcmin. Not far from and possibly a physical companion of NGC 2778. The galaxy has a foreground star lying directly in front of its center, and it has a very diffuse structure, making it difficult to classify.

Historical Identification: Per Dreyer, NGC 2780 (= GC 1776 = JH 567 = WH III 826, 1860 RA 09 04 04, NPD 54 30.4) is "very faint, small, round, small (faint) double star to west".
Physical Information: Apparent size 0.9 by 0.7 arcmin

Historical Identification: Per Dreyer, NGC 2781 (= GC 1777 = JH 569 = JH 3147 = WH I 66, 1860 RA 09 04 50, NPD 104 14.7) is "bright, small, very little extended, pretty suddenly much brighter middle".
Physical Information: Apparent size 3.0 by 1.5 arcmin

Historical Identification: Per Dreyer, NGC 2782 (= GC 1778 = JH 568 = WH I 167, 1860 RA 09 05 11, NPD 49 18.8) is "considerably bright, round, much brighter middle and bright nucleus".
Physical Information: Apparent size 3.7 by 2.4 arcmin. The result of the collision of a much smaller galaxy with a large spiral. Long arcs of material thrown out into intergalactic space are filled with young stars created by the compression of clouds of interstellar gas in the wake of the collision.

Historical Identification: Per Dreyer, NGC 2783 (= GC 1779 = WH III 295, 1860 RA 09 05 21, NPD 59 23.4) is "very faint, very small, round, 2 pretty bright stars to southwest". The second IC adds "is = Bigourdan 274, RA 09 05 14, NPD 59 25".
Physical Information: Apparent size 2.2 by 1.5 arcmin. Possibly a physical pair with IC 2449.

Warning About Non-Standard Designations: IC 2449 has a perfectly good NGC/IC designation of its own, and calling it anything else is foolish and only likely to lead to confusion.
Physical Information: Given its IC designation, see that for anything else.

Historical Identification: Per Dreyer, NGC 2784 (= GC 1780 = JH 571 = JH 3148 = WH I 59, 1860 RA 09 06 05, NPD 113 35.9) is "bright, large, much extended 64°, gradually much brighter middle".
Physical Information: Apparent size 5.5 by 2.2 arcmin. Used by the de Vaucouleurs Atlas of Galaxies as an example of galaxy type SA(l)0°.

Historical Identification: Per Dreyer, NGC 2785 (Stephan list XIII (#45), 1860 RA 09 06 15, NPD 48 30.4) is "extremely faint, pretty small, irregularly extended, several extremely faint stars involved".
Physical Information: Apparent size 1.5 by 0.5 arcmin

Historical Identification: Per Dreyer, NGC 2786 (= GC 5461, Marth #153, 1860 RA 09 06 17, NPD 77 17) is "very faint, very small, much brighter middle".
Physical Information: Apparent size 0.9 by 0.6 arcmin

Historical Identification: Per Dreyer, NGC 2787 (= GC 1781 = JH 570 = WH I 216, 1860 RA 09 06 33, NPD 20 13.0) is "bright, pretty large, a little extended 90°, much brighter middle, mottled but not resolved, very small (faint) star involved to the southeast".
Physical Information: Apparent size 3.1 by 1.8 arcmin

Historical Identification: Per Dreyer, NGC 2788 (= GC 1782 = JH 3150, 1860 RA 09 06 36, NPD 157 21.8) is "very faint, very small, much extended 105°".
Physical Information: Apparent size 1.8 by 0.4 arcmin

Physical Information: Apparent size 2.9 by 0.4 arcmin

Physical Information: Apparent size 1.5 by 0.4 arcmin

Historical Identification: Per Dreyer, NGC 2789 (Stephan list XIII (#46), 1860 RA 09 06 37, NPD 59 41.6) is "pretty faint, small, round, gradually brighter middle". The position precesses to RA 09 15 00.0, Dec +29 43 48, right on the galaxy listed above and there is nothing else nearby, so the identification is certain. (See NGC 3167 for a discussion of the double listing.)
Physical Information: Based on a recessional velocity of 6335 km/sec, NGC 2789 is about 295 million light years away. Given that and its apparent size of 1.6 by 1.35 arcmin, it is about 135 thousand light years across.

Historical Identification: Per Dreyer, NGC 2790 (= GC 5462, Marth #154, 1860 RA 09 07 05, NPD 69 44) is "very faint, small, round, a little brighter middle".
Physical Information: Apparent size 0.6 by 0.4 arcmin

Historical Identification: Per Dreyer, NGC 2791 (= GC 5463, Marth #155, 1860 RA 09 07 08, NPD 71 50) is "faint, round".
Physical Information: Apparent size 0.8 by 0.3 arcmin

Historical Identification: Per Dreyer, NGC 2792 (= GC 1783 = JH 3149, 1860 RA 09 07 11, NPD 131 51.6) is "a remarkable object, a planetary nebula, pretty bright equal to a 9th magnitude star, very small, round, among stars".
PGC Designation Note: For purposes of completeness, LEDA assigns a PGC designation to this object, even though it isn't a galaxy; but a search of the database for that designation returns no result, so it is shown in quotes.
Physical Information: Apparent size 0.35 arcmin

Historical Identification: Per Dreyer, NGC 2793 (= GC 1784 = JH 572, 1860 RA 09 08 11, NPD 54 59.1) is "very faint, small, round, double star 5 seconds of time to west, 5 arcmin to north".
Physical Information: Vr 1685 km/sec. Corwin lists an apparent companion (PGC 82356) at RA 09 16 40.9, Dec +34 26 51 (to the northwest of NGC 2793), but that object has a recessional velocity in excess of 7000 km/sec, and is just an optical double. (Still, in the next iteration of this page I'll provide a link to an entry for that galaxy.) Apparent size 1.2 by 1.0 arcmin?

Historical Identification: Per Dreyer, NGC 2794 (= GC 5464, d'Arrest, 1860 RA 09 08 12, NPD 71 49.2) is "extremely faint, very small, southwestern of 2", the other being NGC 2795.
Physical Information: Apparent size 1.2 by 1.2 arcmin

Historical Identification: Per Dreyer, NGC 2795 (= GC 5465, Marth #156, d'Arrest, 1860 RA 09 08 14, NPD 71 47.0) is "extremely faint, very small, northeastern of 2", the other being NGC 2794.
Physical Information: Apparent size 1.4 by 1.0 arcmin

Historical Identification: Per Dreyer, NGC 2796 (= GC 1785 = JH 573 = WH III 296, 1860 RA 09 08 17, NPD 58 31.8) is "extremely faint, small, round, a little brighter middle".
Physical Information: Apparent size 1.1 by 0.7 arcmin

Historical Identification: Per Dreyer, NGC 2797 (= GC 5466, d'Arrest, 1860 RA 09 08 26, NPD 71 41.6) is "extremely faint, several stars near".
Physical Information: Apparent size 0.6 by 0.5 arcmin

Historical Identification: Per Dreyer, NGC 2798 (= GC 1788 = WH II 708, 1860 RA 09 08 32, NPD 47 27.6) is "pretty bright, small, stellar". The position precesses to RA 09 17 35.4, Dec +41 57 30, about 3.4 arcmin southeast of the galaxy listed above, but the description fits the appearance its nucleus would have presented to Herschel, and there is nothing comparable in the region (there are two other galaxies nearby, but they are too faint for Herschel to have noticed), so the identification is certain.
Usage By The Arp Atlas: NGC 2798 and 2799 are used by the Arp Atlas as an example of galaxies with infall and attraction, with the note "Arc of barely resolved knots curves into nucleus of larger galaxy."
Physical Information: Since NGC 2798 is obviously interacting with NGC 2799, the recessional velocity for the pair should be based on the average of their individual recessional velocities relative to the Cosmic Microwave Background radiation (1936 km/sec for NGC 2798 and 1833 km/sec for NGC 2799). Similarly, redshift-independent distance estimates for the pair should be based on the average of the individual RIDEs (19.7 - 36.6 Mpc for NGC 2798 and 27.4 - 36.3 Mpc for NGC 2799). Based on the averaged recessional velocity relative to the Cosmic Microwave Background radiation for the pair of 1885 km/sec (and H₀ = 70 km/sec/Mpc), the pair is about 85 to 90 million light years away, in good agreement with their averaged redshift-independent distance estimates of about 75 to 120 million light years. Given that and its apparent size of about 2.6 by 0.65 arcmin (from the images below), NGC 2798 is about 65 to 70 thousand light years across.

Historical Identification: Per Dreyer, NGC 2799 (= GC 5467, Copeland (using Lord Rosse's Leviathan), 1860 RA 09 08 40, NPD 47 28.0) is "faint, considerably large, very much extended, east of II 708", (WH) II 708 being NGC 2798. The position precesses to RA 09 17 43.3, Dec +41 57 05, about 3.5 arcmin southeast of the galaxy listed above, the description fits and as noted by Gottlieb (below), Copeland's offsets from NGC 2798 fall exactly on the galaxy listed above, the positional error being due to Herschel's measurement of the position of his II 708; so the identification is absolutely certain.
Discovery Note: Gottlieb notes that Copeland wrote "Faint, considerably large, very much extended 125.9°, position angle 102.7°, distance 97.9 arcsec from II 708 or 8.7 seconds of time east and 21.5 arcsec south (of that object)," and that the offsets fall exactly on the galaxy listed above; but that Dreyer used Herschel's position for II 708 = NGC 2798, so the NGC position for NGC 2799 falls to the southeast of the galaxy in the same way that the NGC position for NGC 2798 falls to the southeast of that galaxy.
Usage By The Arp Atlas: NGC 2798 and 2799 are used by the Arp Atlas as an example of galaxies with infall and attraction, with the note "Arc of barely resolved knots curves into nucleus of larger galaxy."
Physical Information: Since NGC 2799 is obviously interacting with NGC 2798, the recessional velocity for the pair should be based on the average of their individual recessional velocities relative to the Cosmic Microwave Background radiation (1936 km/sec for NGC 2798 and 1833 km/sec for NGC 2799). Similarly, redshift-independent distance estimates for the pair should be based on the average of the individual RIDEs (19.7 - 36.6 Mpc for NGC 2798 and 27.4 - 36.3 Mpc for NGC 2799). Based on the averaged recessional velocity relative to the Cosmic Microwave Background radiation for the pair of 1885 km/sec (and H₀ = 70 km/sec/Mpc), the pair is about 85 to 90 million light years away, in good agreement with their averaged redshift-independent distance estimates of about 75 to 120 million light years. Given that and its apparent size of about 2.0 by 0.45 arcmin (from the images below and in the entry for NGC 2798), NGC 2799 is about 50 thousand light years across.