NGC 556
| Galaxy NGC 556 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | whale |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 01 h 27 m 12.6 s |
| declination | -22 ° 41 ′ 52 ″ |
| Appearance | |
| Morphological type | S0-: / pec |
| Brightness (visual) | 14.9 mag |
| Brightness (B-band) | 15.9 mag |
| Angular expansion | 0.4 ′ × 0.3 ′ |
| Position angle | 136 ° |
| Surface brightness | 12.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.032509 ± 0.000150 |
| Radial velocity | 9746 ± 45 km / s |
|
Stroke distance v rad / H 0 |
(435 ± 31) · 10 6 ly (133.3 ± 9.4) Mpc |
| history | |
| discovery | Frank Muller |
| Discovery date | 1886 |
| Catalog names | |
| NGC 556 • PGC 5420 • ESO 476-013 • 2MASX J01271264-2241519 • SGC 012450-2257.4 • GALEX ASC J012712.71-224151.6 | |
NGC 556 is an elliptical galaxy of Hubble type E / S0 in the constellation Cetus south of the ecliptic . It is estimated to be 435 million light years from the Milky Way and about 50,000 light years across.
In the same area of the sky are u. a. the galaxies NGC 554 , NGC 555 , NGC 578 .
The object was discovered in 1886 by the American astronomer Frank Muller .