NGC 4646
| Galaxy NGC 4646 |
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|---|---|
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| with LEDA 2482812 (l) & LEDA 2482268 (r), SDSS | |
| AladinLite | |
| Constellation | Big Bear |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 42 m 52.1 s |
| declination | + 54 ° 51 ′ 22 ″ |
| Appearance | |
| Morphological type | S0 |
| Brightness (visual) | 13.4 mag |
| Brightness (B-band) | 14.4 mag |
| Angular expansion | 1.0 ′ × 0.8 ′ |
| Position angle | 12 ° |
| Surface brightness | 11.5 mag / arcmin² |
| Physical data | |
| Redshift | 0.015501 ± 0.000150 |
| Radial velocity | 4647 ± 45 km / s |
|
Stroke distance v rad / H 0 |
(212 ± 15) · 10 6 ly (64.9 ± 4.6) Mpc |
| history | |
| discovery | Wilhelm Herschel |
| Discovery date | March 24, 1791 |
| Catalog names | |
| NGC 4646 • UGC 7892 • PGC 42740 • CGCG 270-015 • MCG + 09-21-031 • IRAS F12405 + 5507 • 2MASX J12425218 + 5451215 • GC 3179 • H II 910, II 794 • h 1407 • HARO 32 • LDCE 0914 NED002 | |
NGC 4646 is a 13.4 likes bright lenticular galaxy of Hubble type S0 in the constellation Ursa Major at the northern sky . It is estimated to be 212 million light-years away from the Milky Way and has a diameter of about 60,000 ly.
In the same area of the sky are the galaxies NGC 4644 , NGC 4669 , NGC 4675 , NGC 4686 .
The object was discovered on March 24, 1791 by Wilhelm Herschel with an 18.7-inch reflecting telescope, who described it as "F, S".