NGC 6689
| Galaxy NGC 6689 |
|
|---|---|
|
|
| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Dragon |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 18 h 34 m 50.2 s |
| declination | + 70 ° 31 ′ 26 ″ |
| Appearance | |
| Morphological type | SBcd / HII |
| Brightness (visual) | 12.3 mag |
| Brightness (B-band) | 13.0 likes |
| Angular expansion | 4 ′ × 1.3 ′ |
| Position angle | 171 ° |
| Surface brightness | 13.9 mag / arcmin² |
| Physical data | |
| Redshift | 0.001558 +/- 0.000003 |
| Radial velocity | 467 +/- 1 km / s |
|
Stroke distance v rad / H 0 |
(30 ± 2) x 10 6 ly (9.2 ± 0.65) Mpc |
| history | |
| discovery | Heinrich d'Arrest |
| Discovery date | August 22, 1863 |
| Catalog names | |
| NGC 6689 • NGC 6690 • UGC 11300 • PGC 62077 • CGCG 340-050 • MCG + 12-17-26 • IRAS 18354 + 7028 • 2MASX J18345024 + 7031259 • KAZ 210 • KARA 855 | |
NGC 6689 = NGC 6690 is a bar-spiral galaxy of the Hubble type SBcd in the constellation Dragon . It is around 251 million light years away from the Milky Way .
The galaxy was discovered on August 22, 1863 by Heinrich d'Arrest using an 11-inch telescope and observed again in 1884 by the astronomer Lewis A. Swift without the correspondence being noticed; later both observations by Johan Dreyer were included in his New General Catalog under 6689 and 6690 .