IC 557
| Galaxy IC 557 |
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|---|---|
![IC 557 [1] SDSS image](https://de.wikipedia.org/wiki/Datei:IC557_-_SDSS_DR14.jpg)
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| IC 557 SDSS image | |
| AladinLite | |
| Constellation | lion |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 09 h 44 m 02.400 s |
| declination | + 10 ° 59 ′ 17.22 ″ |
| Appearance | |
| Morphological type | S0 / a / LINER |
| Brightness (visual) | 14.2 mag |
| Brightness (B-band) | 15.0 mag |
| Angular expansion | 0.80 × 0.4 |
| Position angle | 42 ° |
| Surface brightness | 12.8 mag / arcmin² |
| Physical data | |
| Redshift | 0.020296 ± 0.000159 |
| Radial velocity | 6085 ± 48 km / s |
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Stroke distance v rad / H 0 |
(266 ± 19) · 10 6 ly (81.7 ± 5.8) Mpc |
| history | |
| discovery | Stéphane Javelle |
| Discovery date | April 22, 1892 |
| Catalog names | |
| IC 557 • PGC 27866 • CGCG 063-055 • MCG + 02-25-027 • 2MASX J09440241 + 1059174 • NSA 73930 • LDCE 667 NED008 • WISEA J094402.40 + 105917.1 | |
IC 557 is a lens-shaped galaxy of the Hubble type S0 / a with an active galaxy core in the constellation Leo on the ecliptic . It is estimated to be 266 million light years from the Milky Way and about 60,000 light years across.
In the same area of the sky are u. a. the galaxies NGC 2984 , IC 552 , IC 556 .
The object was discovered on April 22, 1892 by the astronomer Stéphane Javelle and later listed by Johan Dreyer in his index catalog .