NGC 4797
Galaxy NGC 4797 / NGC 4798 |
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NGC 4797 SDSS image | |
AladinLite | |
Constellation | Berenike's hair |
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 |
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 ).