Markaryan 205
| Galaxy Markaryan 205 |
|
|---|---|
|
|
| NGC 4319 and Mrk 205 (top right) | |
| AladinLite | |
| Constellation | Dragon |
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Position equinox : J2000.0 , epoch : J2000.0 |
|
| Right ascension | 12 h 21 m 44 s |
| declination | + 75 ° 18 ′ 38 ″ |
| Appearance | |
| Morphological type | SBab; Sy1; BLLAC |
| Brightness (visual) | 14.5 mag |
| Brightness (B-band) | 15.6 mag |
| Physical data | |
| Redshift | 0.070846 ± 0.000163 |
| Radial velocity | (21239 ± 49) km / s |
| distance | 1 billion ly |
| history | |
| Catalog names | |
| PGC 39975 • Mrk 205 • | |
Markarjan 205 ( Mrk 205 , also Mkn 205 ) is a quasar in the constellation Dragon , which was first systematically observed by Benjamin Markarjan . It is about a billion light years from Earth, making it one of the closest quasars. Its redshift is z = + 0.0708.
Markarjan 205 forms an interesting constellation with the nearby spiral galaxy NGC 4319 . Although NGC 4319, with its redshift of z = + 0.0045, is only 80 million light-years from Earth, observations indicate a gravitational interaction between the two objects. From these observations, the American astronomer Halton Arp put forward the controversial hypothesis in 1971 that the distances of Markarjan 205 and NGC 4319 to Earth are about the same and that there must be another reason for the large differences in redshift.