GS 2000+25

{{Short description|Star in the constellation Vulpecula}}

{{more citations needed|date=May 2017}}

{{Starbox begin}}

{{Starbox image

| image = 250px

| caption = Near-infrared (I band) light curves for QZ Vulpeculae, adapted from Chevalier and Ilovaisky (1993). The data were collected over a 10 night period in July 1991. Data collected on different nights are plotted with different colors. The shape of the light curve changed over a period of approximately two days, leading to different shapes on even or odd numbered days.

}}

{{Starbox observe

|constell=Vulpecula

|epoch=J2000

|ra={{RA|20|02|49.58}}{{cite journal|bibcode=2007A&A...469..807L|doi=10.1051/0004-6361:20077303|arxiv=0707.0544|title=A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)|journal=Astronomy & Astrophysics|volume=469|issue=2|pages=807|year=2007|last1=Liu|first1=Q. Z|last2=Van Paradijs|first2=J|last3=Van Den Heuvel|first3=E. P. J|s2cid=14673570}}

|dec={{DEC|+25|14|11.3}}

|appmag_v=18.2

}}

{{Starbox character

|class=Black hole + K3-6 V{{cite journal|bibcode=2008NewAR..51..860Y|doi=10.1016/j.newar.2008.03.017|arxiv=0801.3433|title=Evolution of low-mass binaries with black-hole components|journal=New Astronomy Reviews|volume=51|issue=10–12|pages=860–868|year=2008|last1=Yungelson|first1=L|last2=Lasota|first2=J.-P|s2cid=11830754}}

}}

{{Starbox astrometry

|dist_ly=8800 ± 2300

|dist_pc=2700 ± 700{{cite journal|bibcode=2008MNRAS.387..788R|doi=10.1111/j.1365-2966.2008.13272.x|arxiv=0804.0370|title=Infrared contamination in Galactic X-ray novae|journal=Monthly Notices of the Royal Astronomical Society|volume=387|issue=2|pages=788|year=2008|last1=Reynolds|first1=Mark T|last2=Callanan|first2=Paul J|last3=Robinson|first3=Edward L|last4=Froning|first4=Cynthia S|doi-access=free |s2cid=16918671}}

}}

{{Starbox orbit

|period_unitless=8.26 hr

}}

{{Starbox detail

|component1=Black hole

|mass=7.2–7.8

}}

{{Starbox catalog

|names={{odlist|name=Nova Vul 1988|name2=INTREF 1007|V=QZ Vul}}{{cite simbad|title=GS 2000+25|access-date=26 November 2017}}

}}

{{Starbox reference

|Simbad=V*+QZ+Vul

}}

{{Starbox end}}

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.

Fumiyoshi Makino and the Ginga satellite team discovered GS 2000+25, in April of 1988. A few days later a star, variable in visible light, was identified at its position. It received its variable star designation, QZ Vulpeculae, in 1989.