William Herschel discovered NGC 3790 = H III-109 = h933 on 17 Apr 1784 (sweep 198) and recorded "I suspect a vS stellar nebula in the same field with the preceding one [NGC 3801], about 8 or 10' distant and south-preceding it. The suspected nebula is in a row with two small stars and preceding them." His description fits UGC 6624 perfectly, although the separation is only 7'. Interestingly, although he noticed this fairly faint galaxy in the field of[NGC 3801, he missed NGC 3802, which is located just 2' north. JH made two observations and recorded "F; vS; pmE; sbM; the first of 3 [with[NGC 3801 and 3802]."

400/500mm - 17.5" (4/1/95): faint, fairly small, elongated 2:1 NNW-SSE, very small brighter core, faint stellar nucleus at moments. Collinear with two mag 11.5 and 13 stars 2.3' and 4.7' SE, respectively. First in the NGC 3801 group and located 7.0' WSW of NGC 3801.

600/800mm - 25" (3/31/19 - OzSky): at 244x; fairly faint, small, elongated 2:1 NNW-SSE, contains a brighter elongated core. Collinear with two stars 2.3' and 4.7' SE.

900/1200mm - 48" (4/2/11): bright, fairly large, elongated 3:1 NNW-SSE, 0.9'x0.3', sharply concentrated with a very bright small core. First of six in the NGC 3801 group with MCG +03-30-35 4.5' ESE and NGC 3801 7' ENE. A mag 12.1 star lies 2.3' SE.

Notes by Steve Gottlieb