NGC 6221
| Galaxy NGC 6221 |
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|---|---|
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | altar |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 16 h 52 m 46.1 s |
| declination | -59 ° 13 ′ 07 ″ |
| Appearance | |
| Morphological type | SB (s) bc / pec / Sy1 / Sy2 |
| Brightness (visual) | 10.1 mag |
| Brightness (B-band) | 10.8 mag |
| Angular expansion | 3.5 ′ × 2.5 ′ |
| Position angle | 5 ° |
| Surface brightness | 12.3 mag / arcmin² |
| Physical data | |
| Redshift | 0.004999 +/- 0.000017 |
| Radial velocity | 1499 +/- 5 km / s |
|
Stroke distance v rad / H 0 |
(62 ± 4) · 10 6 ly (19.0 ± 1.3) Mpc |
| history | |
| discovery | John Herschel |
| Discovery date | May 3, 1835 |
| Catalog names | |
| NGC 6221 • PGC 59175 • ESO 138-003 • IRAS 16484-5908 • 2MASX J16524632-5913009 • SGC 164826-5908.0 • AM 1648-590 | |
NGC 6221 is a bar-spiral galaxy with an active nucleus of the Hubble type SB (s) bc in the constellation Altar in the southern sky . It is estimated to be 62 million light years from the Milky Way , about 70,000 ly in diameter, and classified as the Seyfert Galaxy .
The object was discovered on May 3, 1835 by the astronomer John Herschel with the help of his 18.7 inch reflecting telescope and was later included in his New General Catalog by Johan Dreyer .
Web links
- NGC 6221. SIMBAD, accessed July 4, 2016 .
- NGC 6221. DSO Browser, accessed July 4, 2016 .
- Auke Slotegraaf: NGC 6221. Deep Sky Observer's Companion, accessed July 4, 2016 .