NGC 3398
| Galaxy NGC 3398 |
|
|---|---|
|
|
| SDSS recording | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 10 h 51 m 31.4 s |
| declination | + 55 ° 23 ′ 27 ″ |
| Appearance | |
| Morphological type | SA: (s:) b? |
| Brightness (visual) | 13.6 mag |
| Brightness (B-band) | 14.5 mag |
| Angular expansion | 1.0 × 0.3 |
| Position angle | 78 ° |
| Surface brightness | 12.1 mag / arcmin² |
| Physical data | |
| Redshift | 0.009560 ± 0.000130 |
| Radial velocity | (2866 ± 39) km / s |
|
Stroke distance v rad / H 0 |
(131 ± 9) · 10 6 ly (40.1 ± 2.9) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 17, 1789 |
| Catalog names | |
| NGC 3398 • IC 644 • UGC 5954 • PGC 32564 • CGCG 267-018 • MCG + 09-18-038 • 2MASX J10513147 + 5523277 • GC 2219 • H III 792 • | |
NGC 3398 = IC 644 is a spiral galaxy with extensive star formation regions of the Hubble type Sa in the constellation Great Bear in the northern sky . It is estimated to be 131 million light years from the Milky Way .
The object was discovered by Wilhelm Herschel on April 17, 1789 .