Based on a recessional velocity of 7430 km/sec, NGC 2850 is about 345 million light years away. Given that and its apparent size of 0.9 by 0.7 arcmins, it is about 90 thousand light years across.

Based on a recessional velocity of 4885 km/sec, NGC 2857 is about 225 million light years away. Given that and its apparent size of 1.9 by 1.7 arcmins, it is about 125 thousand light years across. The galaxy is the first of six chosen by Halton Arp for his Atlas of Peculiar Galaxies as an example of spiral galaxies of low surface brightness, hence its designation as Arp 1.

Apparent size 4.6 by 4.1 arcmin. Used by the de Vaucouleurs Atlas of Galaxy Types as an example of galaxy type (R)SB(rl)0⁺.

The second IC adds (per Howe) "2869 = 2863"; so the identity of the two entries has been known for more than a century

A closeup of the galaxy shows an apparently ordinary elliptical galaxy; but a wider-field view (such as the "closeup" below) shows clouds of stars extending to the northwest and east.

The second IC lists a corrected RA (per Howe) of 09 16 38

The second IC adds (per Howe) "2869 = 2863"; so the identity of the two entries has been known for more than a century

The first IC adds (for 2871 and 2875) "Not seen by Spitaler; but he is wrong in assuming them = h597 and 598. They are marked ε and γ in the Birr diagram".

Historical Identification: Per Dreyer, NGC 2872 (= GC 1839 = GC 1845 = JH 597 = WH II 57 = WH II 546, 1860 RA 09 18 08, NPD 77 58.0) is "pretty faint, pretty small, round, brighter middle". A note at the end of the NGC says (for NGC 2872 and 2874) "(W)H gives the following places for II 57 and II 58: RA 09 17 08, NPD 77 46.0 and RA 09 17 11, NPD 77 46.3, two objects 1 arcmin distance, northwest and southeast, western one pretty small, eastern one pretty large. They were searched for in vain by Schultz and are not mentioned by d'Arrest, who observed (J)h 597 - 598. They are doubtless identical with the latter, as (W)H's description and relative position agrees with those of (J)h 597-98". Dreyer's position precesses to RA 09 25 43.0, Dec +11 25 55, right on the galaxy listed above, and the position relative to NGC 2874 fits the description in the NGC notes, so the identification is certain.
Physical Information:

Historical Identification: Per Dreyer, NGC 2874 (= GC 1840 = GC 1847 = JH 598 = WH II 58 = WH II 547, 1860 RA 09 18 13, NPD 77 58.5) is "very faint, pretty large, much extended". A note at the end of the NGC says (for NGC 2872 and 2874) "(W)H gives the following places for II 57 and II 58: RA 09 17 08, NPD 77 46.0 and RA 09 17 11, NPD 77 46.3, two objects 1 arcmin distance, northwest and southeast, western one pretty small, eastern one pretty large. They were searched for in vain by Schultz and are not mentioned by d'Arrest, who observed (J)h 597 - 598. They are doubtless identical with the latter, as (W)H's description and relative position agrees with those of (J)h 597-98". Dreyer's position precesses to RA 09 25 48.0, Dec +11 25 25, right on the galaxy listed above, and the position relative to NGC 2872 fits the description in the NGC notes, so the identification is certain.
Physical Information:

The first IC adds (for 2871 and 2875) "Not seen by Spitaler; but he is wrong in assuming them = h597 and 598. They are marked ε and γ in the Birr diagram".

The second IC adds the correction "For 'St IX' read 'St X' ", and "Query = IC 2471, Bigourdan 398"

The second IC notes (per Howe) "The 2 stars are southeast, 9.5 and 10.5 magnitude".

The second IC lists a corrected RA (per Howe) of 09 19 50