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Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Vulpecula |
Right ascension | 20h02m 49.58s[2] |
Declination | +25° 14′ 11.3″[2] |
Apparent magnitude (V) | 18.2[2] |
Characteristics | |
Spectral type | Black hole + K3-6 V[3] |
Astrometry | |
Distance | 8800 ± 2300 ly (2700 ± 700[4] pc) |
Orbit | |
Period (P) | 8.26 hr[2] |
Details | |
Black hole | |
Mass | 7.2–7.8[3] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
GS 2000+25 is an X-ray binary system in the constellation Vulpecula, consisting of a late K-type star and a black hole. It is also an X-ray nova.
Because the black hole is more massive than the companion star, it is the primary of the system. The black hole has a mass of about 5 solar masses while the companion has a mass of about 0.5 solar masses. Because the companion star has a low mass, the system is a low-mass X-ray binary.[6]
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