IC 554
| Galaxy IC 554 / IC 555 |
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|---|---|
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| SDSS recording | |
| AladinLite | |
| Constellation | lion |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 09 h 41 m 56.9 s |
| declination | + 12 ° 17 ′ 47 ″ |
| Appearance | |
| Morphological type | S0? |
| Brightness (visual) | 13.3 mag |
| Brightness (B-band) | 14.3 mag |
| Angular expansion | 1.30 x 0.5 |
| Position angle | 18 ° |
| Surface brightness | 12.7 mag / arcmin² |
| Physical data | |
| Redshift | 0.022792 ± 0.000060 |
| Radial velocity | 6833 ± 18 km / s |
|
Stroke distance v rad / H 0 |
(300 ± 21) x 10 6 ly (92.1 ± 6.4) Mpc |
| history | |
| discovery | Lewis Swift |
| Discovery date | March 28, 1892 |
| Catalog names | |
| IC 554/555 • UGC 5178 • PGC 27716 • CGCG 063-047 • MCG + 02-25-020 • 2MASX J09415692 + 1217468 • NSA 157407 • LDCE 667 NED007 | |
IC 554 = IC 555 is a lenticular galaxy of the Hubble type S0 in the constellation Leo on the ecliptic . It is estimated to be 300 million light years away from the Milky Way and has a diameter of about 120,000 ly. In the same area of the sky there is a. a. the galaxy NGC 2958 .
The object was discovered by Stéphane Javelle on March 22, 1892 and classified as IC 555 in the IC catalog . On March 28, 1892, the astronomer Lewis Swift also discovered an object in the celestial region that has been entered in the index catalog as IC 554 and describes the following position (RA 09 41 47.9 , Dec +12 26 01 ). However, no object can be found here. It is generally believed that Lewis Swift Javelles actually observed IC 555 and only made an error of 10 Arcmin in his declination. Aside from the fact that Swift's position would still be southwest of IC 555 , the descriptions of the two objects are completely different. So it seems much more likely that Swift was observing another, weaker galaxy (in which case he still should have made a big mistake in his position) or mistaking a faint star object for a nebula (which is most likely given his description of the object appears).