... "and friends" is definitely right, as there is plenty to observe in the vicinity of this pair!
In 2017 I observed this area during an all-nighter in the French Ardennes. 14" SCT @ 168x / 29' for all observations.
Arp 166 (NGC750 & NGC751)
This pair also goes by VV' 189 - KPG 46 - Zwicky VI 123. Halton Arp noted a "Small spiral at end of plume" and Fritz Zwicky, too, noted a connection to a red elliptical. The SDDS image reveals PGC2027448 is (visually) connected, but if its redshift in NED is correct, it is in the distant background.
Both galaxies are visible. Without AV the galaxies are detached patches, with AV the halo's of the galaxies overlap. Faint galaxies but a nice view.
The northern galaxy NGC750 is round, larger and slightly brighter than the southern galaxy NGC751 is, gradually brighter in the middle, the nucleus is visible with AV.
The southern galaxy NGC751 is smaller and fainter than NGC750 is and is subtly elongated north to south, even in brightness, the nucleus is visible with AV. The nucleus of NGC751 is just a bit fainter than the nucleus of NGC750 is.
1/2 FoV to the SW are the galaxies NGC736 and NGC738, 1/3 FoV to the NNE is NGC761.
Rating 6/10
Arp 166-1.jpg Arp 166-2.jpg Arp 166-3.jpg
Click here to download the observing guide.
NGC761
A NW-SE elongated glow, clearly fainter than the galaxies NGC750 & NGC751 (Arp 166) that are 1/3 FoV to the SSW. With AV subtly brighter in the middle, no nucleus visible.
To the ENE is an elongated triangle of mag. 12.5 and fainter stars pointing SSW.
To the WNW is a white mag. 9 star (SAO55129). Almost 1/2 FoV to the NE is a white mag. 8.5 star with a mag. 13 star to its SW, ±230°/25" (not a double star in WDS - the mag. 8.5 is component A of the double star HDS267 but has a sep. of 0.2" WDS2017.8).
3/10
NGC739
A small, very faint, round patch, even in brightness, the nucleus is faintly visible with AV.
2/10
NGC736 & NGC738 (with the stars that form NGC737)
NGC736 (SW) and NGC738 (NE) are both visible.
NGC736 is a faint, round glow, suddenly brighter in the middle (quite a large, round core) with a bright nucleus that is visible without AV. To the NNE is a mag. 13.5 star with a mag. 14 star to its SSW: these stars form NGC737.
NGC738 is a small, faint, round patch, even in brightness, no change with AV.
4/10
NGC740
Sharing the FoV with the galaxies NGC736 and NGC738 to the NW: A SE-NW elongated streak, even in brightness, no change with AV.
2/10
NGC733
Sharing the FoV with the galaxies NGC736 and NGC738 to the ESE: To the WNW of NGC736 is an extremely faint, NE-SW elongated glow, at the limit of visibility with AV, even in brightness.
1/10