IC 400
| Galaxy IC 400 |
|
|---|---|
|
|
| AladinLite | |
| Constellation | Hare |
|
Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 05 h 03 m 45.6 s |
| declination | -15 ° 49 ′ 10 ″ |
| Appearance | |
| Morphological type | S. |
| Brightness (visual) | 15.2 mag |
| Brightness (B-band) | 16.0 mag |
| Angular expansion | 1 ′ × 0.2 ′ |
| Position angle | 112 ° |
| Surface brightness | 13.3 mag / arcmin² |
| Physical data | |
| Redshift | 0.011625 +/- 0.000150 |
| Radial velocity | 3485 +/- 45 km / s |
|
Stroke distance v rad / H 0 |
(150 ± 11) x 10 6 ly (46.0 ± 3.3) Mpc |
| history | |
| discovery | Ormond Stone |
| Discovery date | January 21, 1889 |
| Catalog names | |
| IC 400? • PGC 905996 • | |
IC 400 is a galaxy from the Hubble sequence S in the constellation Rabbit . The astronomical object was discovered on January 21, 1889 by the American astronomer Ormond Stone .
In the position indicated by Stone (RA 05 03 43.9, Dec -15 46 00), however, there is nothing. This is hardly surprising, as Stone didn't bother to measure the declination of his object (# 209), only gave the position of his comparison star and an offset in the right ascension so that the observed object was a little north or south of the IC Position could be. There are only two galaxies in the area, both just a few arc minutes south of the specified position. Looking at modern photographs, the more likely candidate seems to be 6dFJ0503456-154909 . However, if we take into account the realities of late 19th century visual observations, the 17th magnitude galaxy listed above is more likely to be IC 400 because the 15th magnitude star combined with its small apparent size make such a galaxy and perfect fits Stone's description with "16.0 Magnitude, 0.1 Arcmin", while the technically brighter, but larger galaxy was probably too weak for him, as its light spreads over a much larger area and other information would have been given. Given these circumstances, it is not surprising that some references list PGC 905996 as IC 400 and others list the other galaxy (but in both cases usually with a warning of the considerable uncertainty of identification).