| Markarian 177 | |
|---|---|
| Observation data (J2000.0[1]epoch) | |
| Constellation | Ursa Major[2] |
| Right ascension | 11h 33m 23.474s[1] |
| Declination | +55° 04′ 20.10″[1] |
| Redshift | 0.008088[1] |
| Distance | 90,000,000 ly (28 Mpc)[2]h−1 0.678 |
| Apparent magnitude (V) | 15.7[1] |
| Notable features | |
| Other designations | |
| Markarian 177, MKR 177, MKN 177, MRK 177, Mark 177, 2MASX J11332348+5504204,[4] SDSS J113323.47+550420.6,[1] PGC 35678,[1] LEDA 35678,[4] UGCA 239[1] | |
Markarian 177 is ablue compact[5]dwarf galaxy located 90,000,000 ly (28 Mpc) away, at theconstellation ofUrsa Major, in the bowl of theBig Dipper asterism.[2] It was discovered by the astronomerBenjamin Markarian.
Markarian 177 is apeculiar galaxy[5] that is receding from us at a rate of 2425 km/s. It has a visual apparent size of 0.41×0.34arcmin.[1]
Near the galaxy, at over 2,600 ly (800 pc) from it, is aluminous X-ray source namedSDSS 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 ejectedsupermassive black hole from a galaxy that interacted with Markarian 177.
Alternative explanations for the X-ray source include it possibly being aluminous blue variable star that has recently undergone asupernova in the early 2000s, where for the previous five decades it had been in continuous eruption.[2][3][6]