HR 6902

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title: "HR 6902" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["ophiuchus", "g-type-bright-giants", "eclipsing-binaries", "b-type-main-sequence-stars", "bright-star-catalogue-objects", "objects-with-variable-star-designations", "henry-draper-catalogue-objects", "hipparcos-objects", "durchmusterung-objects"] description: "Star system in the constellation Ophiuchus" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/HR_6902" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star system in the constellation Ophiuchus ::

| name = HR 6902 | image = [[Image:V2291OphLightCurve.png|250px]] | caption = Visible, blue and ultraviolet light curves for an eclipse of V2291 Ophiuchi, adapted from Griffin et al. (1995) | epoch = J2000 | constell = Ophiuchus | ra = | dec = | appmag_v = +5.64 | class = G9IIb / B8V | variable = Zeta Aurigae-type | radial_v = | prop_mo_ra = −3.920 | prop_mo_dec = −6.549 | parallax = 3.7061 | p_error = 0.1604 | parallax_footnote = | absmag_v = –1.33 | period = 1.055 | axis_unitless = 1.96 AU | eccentricity = 0.311 | inclination = 87 | mass = 3.86/2.95 | radius = 33/3 | luminosity = 562/146 | temperature = 4,900/11,600 | names = V2291 Oph, GSC 01023-02454, HD 169690, HD 169689, 2MASS J18253880+0801551, BD+07 3682, FK5 1478, PPM 165790, HIP 90313, SAO 123462 | Simbad = HR+6902

HR 6902 (also designated V2291 Oph) is a binary system located 880 light years away 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.

References

References

1. {{cite Gaia DR3. 4478420918484111360
2. Kirsch. (2001). "The warm circumstellar envelope and wind of the G9 IIb star HR 6902". [[Astronomy and Astrophysics]].
3. (September 1995). "Optical spectra of ζ Aurigae binary systems. VII. The 1987 and 1989 eclipses of HR 6902". Astronomy and Astrophysics.
4. (February 1999). "Late-type giants with infrared excess. I. Lithium abundances". Astronomy and Astrophysics.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::