NGC 5731
| Galaxy NGC 5731 |
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|---|---|
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| SDSS recording | |
| AladinLite | |
| Constellation | Bear keeper |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 14 h 40 m 09.2 s |
| declination | + 42 ° 46 ′ 46 ″ |
| Appearance | |
| Morphological type | Sbc |
| Brightness (visual) | 13.3 mag |
| Brightness (B-band) | 14.1 mag |
| Angular expansion | 1.6 ′ × 0.4 ′ |
| Position angle | 116 ° |
| Surface brightness | 12.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.008463 ± 0.000030 |
| Radial velocity | (2537 ± 9) km / s |
|
Stroke distance v rad / H 0 |
(118 ± 8) · 10 6 ly (36.3 ± 2.5) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | April 9, 1787 |
| Catalog names | |
| NGC 5731 • IC 1045 • UGC 9460 • PGC 52409 • CGCG 220-045 • MCG + 07-30-47 • IRAS 14382 + 4259 • GC 3980 • H III 658 • h 1868 • | |
NGC 5731 is a 13.3 likes bright spiral galaxy of Hubble type Sbc in the constellation Bootes . Together with NGC 5730 it forms a gravitationally bound and interacting double galaxy and is also 118 million light-years away from the Milky Way due to its almost identical radial velocity .
It was discovered together with NGC 5730 on April 9, 1787 by Wilhelm Herschel with an 18.7-inch reflector telescope, who called it “Two. Both vF, vS, E in different directions, 2 or 3 ′ distant in parallel, each south of a small star ”.
Due to an error in Herschel's position information, the observation by Lewis A. Swift on September 1, 1888 under IC 1045 led to an entry in the index catalog ; with correct description, but also with incorrect position.