GRS 1915+105
Binary system in the constellation Aquila / From Wikipedia, the free encyclopedia
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GRS 1915+105 or V1487 Aquilae is an X-ray binary star system which features a regular star and a black hole. It was discovered on August 15, 1992 by the WATCH all-sky monitor aboard Granat.[5] "GRS" stands for "GRANAT source", "1915" is the right ascension (19 hours and 15 minutes) and "105" reflects the approximate declination (10 degrees and 56 arcminutes). The near-infrared counterpart was confirmed by spectroscopic observations.[6] The binary system lies 11,000 parsecs away[7] in Aquila. GRS 1915+105 is the heaviest of the stellar black holes so far known in the Milky Way Galaxy,[8] with 10 to 18 times the mass of the Sun.[9] It is also a microquasar, and it appears that the black hole rotates at least 950 times per second, close to the maximum of 1,150 times per second, with a spin parameter value between 0.82 and 1.00 (maximum possible value).[10][11]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 15m 11.6s[2] |
Declination | +10° 56′ 44″[2] |
Characteristics | |
Evolutionary stage | Microquasar[3] |
Spectral type | KIII[4] |
Astrometry | |
Parallax (π) | 0.120 ± 0.009 mas[3] |
Distance | 28,000 ly (8,600+2,000 −1,600[3] pc) |
Details | |
Black hole | |
Mass | 12.4+2.0 −1.8[3] M☉ |
Other designations | |
Database references | |
SIMBAD | data |