R Aurigae

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Star in the constellation Auriga

title: "R Aurigae" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["auriga", "mira-variables", "m-type-giants", "double-stars", "henry-draper-catalogue-objects", "hipparcos-objects", "objects-with-variable-star-designations", "bright-star-catalogue-objects", "durchmusterung-objects", "emission-line-stars"] description: "Star in the constellation Auriga" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/R_Aurigae" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Auriga ::

| name = R Aurigae}} | image = [[Image:RAurLightCurve.png|250px]] | caption = The visual band light curve of R Aurigae, from AAVSO data | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Auriga | ra = | dec = | appmag_v=6.7 to 13.9 | type = AGB | class = M7IIIe (M6e - M9e) | u-b = +0.27 | b-v = +1.66 | variable = Mira | radial_v = | prop_mo_ra = +14.708 | prop_mo_dec = −14.685 | parallax = 3.4958 | p_error = 0.1327 | parallax_footnote = | absmag_v= | mass = 3.7 | gravity = 1.60 | temperature = 2,385{{cite journal | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 }} | luminosity = 11,530 | radius = 740 | names=R Aur, ADS 3845 A, BD+53 882, CCDM J05173+5335A, GC 6435, HD 34019, HIP 24645, HR 1707, IDS 05092+5328 A, SAO 25112 | Simbad=R+Aur}}

R Aurigae (R Aur) is a Mira variable, a pulsating red giant star in the constellation of Auriga, at a distance of .

In 1862 R Aurigae was found to be a variable star at Bonn Observatory. It was widely observed in the late 19th century and its spectrum was described in 1890. In 1907 it appeared with its variable star designation in Annie Jump Cannon's Second Catalogue of Variable Stars. R Aurigae has an apparent visual magnitude which varies between 6.7 and 13.9 with a period of 450 days. The light curve varies strongly from cycle to cycle, sometimes having a pronounced hump on the ascending branch and usually having rise and fall times approximately equal. The cycle period has oscillated slowly between about 450 and 465 days.

R Aurigae is catalogued as a component of a double star, with the 10th magnitude HD 233095, although the two stars are unrelated.

References

R Aur, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars] {{Webarchive. link. (2017-06-20 , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 10, 2009.)
(2025). "Stellar Evolution Along the Asymptotic Giant Branch as Revealed by the Shape of Miras' Visual Light Curves". The Astrophysical Journal.
(1994). "Photometry of Stars in the Field of R Aurigae". Information Bulletin on Variable Stars.
CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 10, 2009.
{{cite Gaia DR3. 266367210206027776
(2024). "Transferring spectroscopic stellar labels to 217 million ''Gaia'' DR3 XP stars with SHBoost". Astronomy & Astrophysics.
(2022). "Stellar and substellar companions from ''Gaia'' EDR3". Astronomy & Astrophysics.
"V* R Aur".
"LPV of the Month December, 2016".
(2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal.
(1907). "Second catalogue of variable stars". Annals of Harvard College Observatory.
"Download Data". AAVSO.

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