Markarian 177
| Markarian 177 | |
|---|---|
| Observation data (J2000.0 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 11h 33m 23.474s |
| Declination | +55° 04′ 20.10″ |
| Redshift | 0.008088 |
| Distance | 90,000,000 ly (28 Mpc)h−1 0.678 |
| Apparent magnitude (V) | 15.7 |
| Notable features | |
| Other designations | |
| Markarian 177, MKR 177, MKN 177, MRK 177, Mark 177, 2MASX J11332348+5504204, SDSS J113323.47+550420.6, PGC 35678, LEDA 35678, UGCA 239 | |
Markarian 177 is a blue compactdwarf galaxy located 90,000,000 ly (28 Mpc) away, at the constellation of Ursa Major, in the bowl of the Big Dipper asterism. It was discovered by the astronomer Benjamin Markarian.
Markarian 177 is a peculiar galaxy that is receding from us at a rate of 2425 km/s. It has a visual apparent size of 0.41×0.34 arcmin.
Near the galaxy, at over 2,600 ly (800 pc) from it, is a luminous X-ray source named SDSS J113323.97+550415.8 (SDSS1133), in orbit around Markarian 177. The source has been stable for some decades from the 1950s through the 2000s, and the emission region is some 40 ly (12 pc) wide. It may be an ejected supermassive black hole from a galaxy that interacted with Markarian 177.
Alternative explanations for the X-ray source include it possibly being a luminous blue variable star that has recently undergone a supernova in the early 2000s, where for the previous five decades it had been in continuous eruption.
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