NGC 4821
| Galaxy NGC 4821 |
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|---|---|
![NGC 4821 & NGC 4819 (o) [1] SDSS image](https://de.wikipedia.org/wiki/Datei:NGC4821_-_SDSS_DR14.jpg)
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| NGC 4821 & NGC 4819 (o) 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 56 m 29.1 s |
| declination | + 26 ° 57 ′ 25 ″ |
| Appearance | |
| Morphological type | E4: |
| Brightness (visual) | 14.5 mag |
| Brightness (B-band) | 15.5 mag |
| Angular expansion | 0.5 ′ × 0.3 ′ |
| Position angle | 5 ° |
| Surface brightness | 12.5 mag / arcmin² |
| Physical data | |
| Affiliation | Abell 1656 WBL 426 |
| Redshift | 0.023536 ± 0.000025 |
| Radial velocity | 7056 ± 7 km / s |
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Stroke distance v rad / H 0 |
(316 ± 22) · 10 6 ly (96.8 ± 6.8) Mpc |
| history | |
| discovery | Heinrich d'Arrest |
| Discovery date | April 6, 1864 |
| Catalog names | |
| NGC 4821 • PGC 44148 • CGCG 160-024 • MCG + 05-31-015 • 2MASX J12562911 + 2657250 • GC 5682 • GALEX ASC J125629.26 + 265723.6 • LDCE 926 NED025 • HOLM 490B | |
NGC 4821 is a 14.5 mag bright elliptical galaxy of the Hubble-type E4 in the constellation Haar der Berenike in the northern sky . It is an estimated 316 million light years from the Milky Way and about 45,000 light years in diameter. Together with NGC 4819 , it forms the galaxy pair Holm 490 and is considered a member of the Coma galaxy cluster Abell 1656 .
The object was discovered on April 6, 1864 by Heinrich Louis d'Arrest .
Web links
- NGC 4821. SIMBAD , accessed February 15, 2015 .
- NGC 4821. DSO Browser, accessed February 15, 2015 .
- Auke Slotegraaf : NGC 4821. Deep Sky Observer's Companion, accessed on February 15, 2015 .