NGC 4797
| Galaxy NGC 4797 / NGC 4798 |
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![NGC 4797 [1] SDSS image](https://de.wikipedia.org/wiki/Datei:NGC4798_-_SDSS_DR14.jpg)
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| NGC 4797 SDSS image | |
| AladinLite | |
| Constellation | Berenike's hair |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 54 m 55.169 s |
| declination | + 27 ° 24 ′ 45.74 ″ |
| Appearance | |
| Morphological type | S0-: / AGN |
| Brightness (visual) | 13.2 mag |
| Brightness (B-band) | 14.2 mag |
| Angular expansion | 1.0 ′ × 0.7 ′ |
| Position angle | 30 ° |
| Surface brightness | 12.9 mag / arcmin² |
| Physical data | |
| Affiliation | Abell 1656 WBL 426 |
| Redshift | 0.026228 ± 0.000036 |
| Radial velocity | 7863 ± 11 km / s |
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Stroke distance v rad / H 0 |
(352 ± 25) x 10 6 ly (107.8 ± 7.6) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 11, 1785 |
| Catalog names | |
| NGC 4797, 4798 • UGC 8038 • PGC 43981 • CGCG 159-118 • 160-013 • MCG + 05-31-004 • GC 5679, 3303 • H II 382 • h 1477 • LDCE 0926 NED017 | |
NGC 4797 = NGC 4798 is an elliptical galaxy of the Hubble type E / S0 with an active galaxy core in the constellation Haar der Berenike in the northern sky . It is an estimated 352 million light years from the Milky Way and about 100,000 light years in diameter.
In the same area of the sky are u. a. the galaxies NGC 4788 , NGC 4789 , NGC 4807 , IC 3900 .
The object was discovered twice; first on April 11, 1785 by Wilhelm Herschel with an 18.7-inch reflector telescope , who described it as “F, pS” (observation listed in the catalog as NGC 4798 ); then on April 21, 1865 by Heinrich Louis d'Arrest (and listed as NGC 4797 ).