NGC 6239
| Galaxy NGC 6239 |
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|---|---|
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Hercules |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 16 h 50 m 05.0 s |
| declination | + 42 ° 44 ′ 23 ″ |
| Appearance | |
| Morphological type | SB (s) b / pec? / HII |
| Brightness (visual) | 12.1 mag |
| Brightness (B-band) | 12.9 mag |
| Angular expansion | 2.4 ′ × 1.1 ′ |
| Position angle | 118 ° |
| Surface brightness | 13.0 mag / arcmin² |
| Physical data | |
| Redshift | 0.003079 +/- 0.000009 |
| Radial velocity | 923 +/- 3 km / s |
|
Stroke distance v rad / H 0 |
(49 ± 4) · 10 6 ly (15.0 ± 1.1) Mpc |
| history | |
| discovery | William Herschel |
| Discovery date | April 12, 1788 |
| Catalog names | |
| NGC 6239 • UGC 10577 • PGC 59083 • CGCG 225-002 • CGCG 224-105 • MCG + 07-35-001 • IRAS 16484 + 4249 • 2MASX J16500502 + 4244234 • GC 4247/5832 • H III 727 • | |
NGC 6239 is a bar-spiral galaxy with extensive star formation regions of the Hubble type SB (s) b in the constellation Hercules . It is estimated to be 49 million light years from the Milky Way and about 30,000 light years in diameter.
The object was discovered on April 12, 1788 by the astronomer William Herschel with the help of his 18.7 inch reflector telescope and was later added to his New General Catalog by Johan Dreyer .
Web links
- NGC 6239. SIMBAD, accessed July 4, 2016 .
- NGC 6239. DSO Browser, accessed July 4, 2016 .
- Auke Slotegraaf: NGC 6239. Deep Sky Observer's Companion, accessed on July 4, 2016 .