IC 1784
| Galaxy IC 1784 |
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|---|---|
![IC 1785 & IC 1784 [1]](https://de.wikipedia.org/wiki/Datei:IC1784_-_SDSS_DR14.jpg)
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| IC 1785 & IC 1784 | |
| AladinLite | |
| Constellation | triangle |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 02 h 16 m 12.79 s |
| declination | + 32 ° 38 ′ 58.2 ″ |
| Appearance | |
| Morphological type | SA (rs) bc |
| Brightness (visual) | 13.1 mag |
| Brightness (B-band) | 14.0 mag |
| Angular expansion | 1.40 'x 0.7' |
| Position angle | 88 ° |
| Surface brightness | 13.5 mag / arcmin² |
| Physical data | |
| Affiliation | IC 1784 group LGG 55 |
| Redshift | 0.016064 ± 0.000020 |
| Radial velocity | 4816 ± 6 km / s |
|
Stroke distance v rad / H 0 |
(220 ± 15) · 10 6 ly (67.6 ± 4.7) Mpc |
| history | |
| discovery | Stéphane Javelle |
| Discovery date | January 20, 1898 |
| Catalog names | |
| IC 1784 • UGC 1744 • PGC 8676 • CGCG 504-041 • MCG + 05-06-019 • IRAS 02132 + 3225 • KUG 0213 + 324 • 2MASX J02161279 + 3238583 • KPG 061A • LDCE 157 NED001 • NVSS J021612 + 323858 • WISEA J021612.77 + 323858.0 | |
IC 1784 is a spiral galaxy of the Hubble type Sb / P in the constellation Triangle in the northern sky . It is around 220 million light years away from the Milky Way and has a diameter of around 90,000 light years. Together with IC 1785 it forms the gravitationally bound galaxy pair KPG 61 and it is considered a member of the IC 1784 group ( LGG 55 ).
In the same area of the sky is u. a. the galaxy IC 1789 .
The object was discovered by Stéphane Javelle on January 20, 1898 .
IC-1784 group ( LGG 55 )
| Galaxy | Alternative name | Distance / million ly |
|---|---|---|
| IC 1784 | PGC 8676 | 220 |
| IC 1785 | PGC 8682 | 218 |
| IC 1789 | PGC 8766 | 219 |
| PGC 8829 | UGC 1778 | 230 |
| PGC 9004 | UGC 1826 | 232 |