NGC 7817
| Galaxy NGC 7817 |
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|---|---|
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| SDSS recording | |
| AladinLite | |
| Constellation | Pegasus |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 00 h 03 m 58.9 s |
| declination | + 20 ° 45 ′ 08 ″ |
| Appearance | |
| Morphological type | SAbc: / sp / HII |
| Brightness (visual) | 11.8 mag |
| Brightness (B-band) | 12.6 mag |
| Angular expansion | 3.5 ′ × 0.9 ′ |
| Position angle | 45 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Redshift | 0.007702 ± 0.000013 |
| Radial velocity | +2309 ± 4 km / s |
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Stroke distance v rad / H 0 |
(110 ± 8) x 10 6 ly (33.8 ± 2.4) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | September 15, 1784 |
| Catalog names | |
| NGC 7817 • UGC 19 • PGC 279 • CGCG 456-28 • MCG + 03-01-21 • IRAS 00014 + 2028 • 2MASX J00035889 + 2045084 • GC 5049 • H II 227 • h 2300 • Kara 4 • TC 419 | |
NGC 7817 is a spiral galaxy of the Hubble type Sbc and is located about 5 ° north of the star Algenib (γ Pegasi) in the constellation Pegasus in the northern sky . It is estimated to be 110 million light years from the Milky Way and about 120,000 light years in diameter . The galaxy is believed to be the gravitational partner of NGC 7798 .
The object was on September 15, 1784 by Wilhelm Herschel .
Web links
Commons : NGC 7817 - collection of images, videos, and audio files
