Galaxy NGC 7640
History
The galaxy NGC 7640 was discovered in 1784 with his home-made 18.7 inch f/12.8 reflecting telescope in Slough, England. On 17 October 1786 he cataloged it as II 600. [277, 464]
Physical Properties
Distance measurements of this SBc-type galaxy range from 8.4 Mpc to 11.9 Mpc. [145] There are indications, that the increased star formation is due to a recent interaction with a smaller galaxy. [431]
| Designation | NGC 7640 |
| Type | Gx (SBc) |
| Right Ascension (J2000.0) | 23h 22m 06.6s |
| Declination (J2000.0) | +40° 50' 42" |
| Diameter | 10.5 × 1.8 arcmin |
| Photographic (blue) magnitude | 11.9 mag |
| Visual magnitude | 11.3 mag |
| Surface brightness | 14.5 mag·arcmin-2 |
| Position Angle | 167° |
| Redshift (z) | 0.001231 |
| Distance derived from z | 5.20 Mpc |
| Metric Distance | 8.510 Mpc |
| Dreyer Description | cF, L, mE 164°, vlbM, r |
| Identification, Remarks | UGC 12554, MCG 7-48-2, CGCG 532-17, CGCG 533-1, IRAS 23197+4034 |
Finder Chart
The galaxy NGC 7640 is located in the constellation Andromeda. The best observation time is July to February, when it is highest at night.
