GRO J1719-24

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

{{starbox begin| name = GRO J1719-24}}

{{Starbox image

| image = 250px

| caption = A visual band light curve showing superhumps of V2293 Ophiuchi, adapted from Masetti et al. (1996)

}}

{{starbox observe| ra={{RA|17|19|37}}{{citation needed|date=April 2017}}| dec={{DEC|-25|01|03}}{{citation needed|date=April 2017}}| constell=Ophiuchus| epoch=J2000|

appmag_v= 16.65{{citation needed|date=April 2017}}}}

{{starbox astrometry | dist_ly=8500{{citation needed|date=April 2017}}| dist_pc=2600{{citation needed|date=April 2017}} | absmag_v=≥6}}

{{Starbox reference | Simbad = V2293+Oph }}

{{starbox end}}

GRO J1719-24 (GRS 1716-249, V2293 Oph, X-Ray Nova Ophiuchi 1993) is believed to be a low-mass X-ray binary.{{citation|last1=Della Valle | first1=M. | last2=Mirabel | first2=I.F.| last3=Rodriguez | first3=L.F. | date=1994 | journal=Astronomy and Astrophysics| volume=290 | page=803 | title=The optical and radio counterpart of the X-ray Nova Ophiuchi 1993 | bibcode=1994A&A...290..803D }} Its name derives from an X-ray transient, detected in 1993.{{citation|last1=Ballet | first1=J. | last2=Denis | first2=M.| last3=Gilfanov | first3=M. | first4=Sunyaev | last4=R.| date=1993| title=IAU Circ.| volume=5874}} The system consists of a black hole candidate and a low mass companion, estimated to be a main sequence star of the spectral type K0-5 V.

{{citation|last1=Chaty | first1= S. |

last2=Mirabel | first2= I. F. |

last3=Goldoni | first3= P. |

last4=Mereghetti | first4= S. |

last5=Duc | first5= P.-A. |

last6=Martí | first6= J. |

last7=Mignani | first7= R. P. |

title=Near-infrared observations of Galactic black hole candidates|

journal=MNRAS|volume=331|number=4|date=2002|doi=10.1046/j.1365-8711.2002.05267.x | pages=1065–1071| doi-access= free |arxiv=astro-ph/0112329|bibcode=2002MNRAS.331.1065C| s2cid= 15529877 }}

The rotation period is uncertain, estimated at 14.7h. The light curve possibly exhibits some faster fluctuations as well, which are hypothesized to be produced by blobs of matter in the accretion disk.