NGC 998
| Galaxy NGC 998 |
|
|---|---|
![SDSS image of NGC 998, LEDA 200205 & NGC 997 [1]](https://de.wikipedia.org/wiki/Datei:NGC998_-_SDSS_DR14.jpg)
|
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| SDSS image of NGC 998, LEDA 200205 & NGC 997 | |
| AladinLite | |
| Constellation | whale |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 02 h 37 m 16.5 s |
| declination | + 07 ° 20 ′ 09 ″ |
| Appearance | |
| Morphological type | S? |
| Brightness (visual) | 14.8 mag |
| Brightness (B-band) | 15.6 mag |
| Angular expansion | 0.8 ′ × 0.5 ′ |
| Position angle | 177 ° |
| Surface brightness | 13.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.021838 ± 0.000163 |
| Radial velocity | 6547 ± 49 km / s |
|
Stroke distance v rad / H 0 |
(294 ± 21) x 10 6 ly (90.2 ± 6.3) Mpc |
| history | |
| discovery | Albert Marth |
| Discovery date | November 10, 1863 |
| Catalog names | |
| NGC 998 • UGC 2102 • PGC 9934 • CGCG 414-028 • MCG + 01-07-015 • 2MASX 02371649 + 0720091 • NSA 132315 • USGC U136 NED02 | |
NGC 998 is a spiral galaxy of the Hubble-Type S constellation Whale south of the celestial equator . It is an estimated 294 million light years away from the Milky Way and has a diameter of about 90,000 ly. Together with NGC 997 , it forms a gravitationally bound galaxy pair.
The object was by astronomer Albert Marth using on November 10, 1863 a 48-inch - telescope discovered.
Web links
Commons : NGC 998 - collection of images, videos, and audio files
