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<ref name="Chevalier">{{cite journal |last1=Chevalier |first1=C. |last2=Ilovaisky |first2=S. A. |title=Optical studies of transient low-mass X-ray binaries. IV. A 10-hour distorsion wave in the quiescent light curve of GS 2000+25 |journal=Astronomy and Astrophysics |date=March 1993 |volume=269 |pages=301–309 |bibcode=1993A&A...269..301C |url=https://ui.adsabs.harvard.edu/abs/1993A&A...269..301C |access-date=28 May 2022}}</ref> |
<ref name="Chevalier">{{cite journal |last1=Chevalier |first1=C. |last2=Ilovaisky |first2=S. A. |title=Optical studies of transient low-mass X-ray binaries. IV. A 10-hour distorsion wave in the quiescent light curve of GS 2000+25 |journal=Astronomy and Astrophysics |date=March 1993 |volume=269 |pages=301–309 |bibcode=1993A&A...269..301C |url=https://ui.adsabs.harvard.edu/abs/1993A&A...269..301C |access-date=28 May 2022}}</ref> |
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<ref name=filipenko>{{cite journal|bibcode=1995ApJ...455L.139F|title=A Black Hole in the X-Ray Nova GS 2000+25|journal=Astrophysical Journal Letters |volume=455|issue=2|pages=L139|last1=Filippenko|first1=Alexei V.|last2=Matheson|first2=Thomas|last3=Barth|first3=Aaron J.|year=1995|doi=10.1086/309831|s2cid=123161764 }}</ref> |
<ref name=filipenko>{{cite journal|bibcode=1995ApJ...455L.139F|title=A Black Hole in the X-Ray Nova GS 2000+25|journal=Astrophysical Journal Letters |volume=455|issue=2|pages=L139|last1=Filippenko|first1=Alexei V.|last2=Matheson|first2=Thomas|last3=Barth|first3=Aaron J.|year=1995|doi=10.1086/309831|s2cid=123161764 |doi-access=free}}</ref> |
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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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