NGC 4842
| Galaxy NGC 4842 |
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|---|---|
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| SDSS recording | |
| AladinLite | |
| Constellation | Berenike's hair |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 12 h 57 m 35.9 s |
| declination | + 27 ° 29 ′ 21 ″ |
| Appearance | |
| Morphological type | A: E0 B: E3 |
| Brightness (visual) | A: 14.0 mag B: 15.1 mag |
| Brightness (B-band) | A: 15.0 mag B: 16.1 mag |
| Angular expansion | A: 0.4 ′ × 0.4 ′ B: 0.3 ′ × 0.2 ′ |
| Surface brightness | A / B: 12.1 mag / arcmin² |
| Physical data | |
| Redshift | 0.025004 |
| Radial velocity | 7496 km / s |
|
Stroke distance v rad / H 0 |
(335 ± 23) x 10 6 ly (102.8 ± 7.2) Mpc |
| history | |
| discovery | Heinrich d'Arrest |
| Discovery date | April 24, 1865 |
| Catalog names | |
| NGC 4842, 4842A, 4842B, 4842-1, 4842-2 • PGC 44337, 44338 • CGCG 160-046 • MCG + 05-31-030, + 05-31-031 • GC 5685 • | |
NGC 4842 consists of two separate galaxies; NGC 4842 A (also NGC 4842–1 ) is a 14.0 mag bright elliptical galaxy of the Hubble type E0; NGC 4842 B (also NGC 4842–2 ) a 15.1 mag bright elliptical galaxy of the Hubble type E3. Both galaxies form a gravitational double galaxy in the constellation Haar der Berenike and are about 335 million light years away from the Milky Way.
They were discovered by Heinrich Louis d'Arrest on April 24, 1865 .
Web links
- NGC 4842. SIMBAD, accessed February 18, 2015 .
- Auke Slotegraaf: NGC 4842. Deep Sky Observer's Companion, accessed February 18, 2015 .