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{{Starbox begin
| name = HR 6902
}}{{Starbox observe
| epoch = J2000
| constell = Ophiuchus
| ra = {{RA|18|25|38.799}}[1]
| dec = {{DEC|+08|01|55.23}}[1]
| appmag_v = +5.64
}}{{Starbox character
| class = G9IIb / B8V
| variable = Zeta Aurigae-type
}}{{Starbox astrometry
| radial_v =
| prop_mo_ra = -4.07 ± 0.54[1]
| prop_mo_dec = -6.34 ± 0.31[1]
| parallax = 4.14
| p_error = 0.41
| parallax_footnote = [1]
| absmag_v = –1.33
}}{{Starbox detail
| mass = 3.86/2.95[8]
| radius = 33/3[8]
| luminosity = 562/146
| temperature = 4900/11600[8]
}}{{Starbox orbit
| period = 1.055[8]
| axis_unitless = 1.96[8] AU
| eccentricity = 0.311[8]
| inclination = 87[8]
}}{{Starbox catalog
| names = V2291 Oph, GSC 01023-02454, HD 169690, HD 169689, 2MASS J18253880+0801551, BD+07 3682, FK5 1478, PPM 165790, HIP 90313, SAO 123462
}}{{Starbox reference
| Simbad = HR+6902
}}{{Starbox end}}HR 6902 (also designated V2291 Oph) is a binary system located 790 light years away[1] from the Sun in the Ophiuchus constellation. The system includes an orange bright giant star and a B-type main sequence star, forming an eclipsing binary of Zeta Aurigae type. The system is also surrounded by a warm circumstellar envelope and the spectra show silicon and carbon absorption up to a distance of 3.3 giant radii.[1]References1. ^1 2 3 4 5 6 7 {{cite journal| doi=10.1051/0004-6361:20011117| author=Kirsch| last2=Baade| first2=R.| last3=Reimers| first3=D.| title=The warm circumstellar envelope and wind of the G9 IIb star HR 6902| journal=Astronomy and Astrophysics| volume=379| issue=3| pages=925–935| date=2001| bibcode=2001A&A...379..925K|arxiv = astro-ph/0008378 }}
2. ^1 2 3 4 5 6 {{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }} Vizier catalog entry
}}{{Stars of Ophiuchus}} 9 : Ophiuchus (constellation)|G-type bright giants|Eclipsing binaries|B-type main-sequence stars|HR objects|Objects with variable star designations|Henry Draper Catalogue objects|Hipparcos objects|Durchmusterung objects |