26 Aurigae

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

{{Starbox begin |

name=26 Aurigae }}

{{Starbox observe

| epoch=J2000

| ra={{RA|05|38|38.08510}}{{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|author1=van Leeuwen, F.|display-authors=etal|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|s2cid = 18759600}}

| dec= {{DEC|+30|29|32.7054}}

| appmag_v=5.406{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author1=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}} (6.29 / 6.21)

| constell=Auriga

}}

{{Starbox character

| class=G8III + A1IV or B9.5V{{cite journal|title=Orbital Elements for BU 1240 AB. Nature of the C and D Components|author=Rica Romero, F. M.|journal=Revista Mexicana de Astronomía y Astrofísica|volume=44|pages=137–147|date=2008|bibcode=2008RMxAA..44..137R}}

| r-i =

| v-r =

| b-v = +0.45{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|date=1986|bibcode= 1986EgUBV........0M}}

| u-b = +0.25

| variable=suspected{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

}}

{{Starbox astrometry

| radial_v=

| prop_mo_ra=-21.32

| prop_mo_dec=-10.10

| parallax=

| p_error=

| dist_pc=163

| absmag_v={{val|-0.29}}{{cite journal|bibcode=2002ApJS..143..513G|title=Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components|journal=The Astrophysical Journal Supplement Series|volume=143|issue=2|pages=513|last1=Ginestet|first1=N.|last2=Carquillat|first2=J. M.|year=2002|doi=10.1086/342942|doi-access=free}}

}}

{{Starbox orbit

| reference =

| primary=26 Aur A

| name=26 Aur B

| period={{val|52.735|0.156}}

| axis={{val|0.154|0.001}}

| axis_unitless={{val|21.1|3.2|2.4|ul=AU}}

| eccentricity={{val|0.653|0.002}}

| inclination={{val|124.22|0.29}}

| node={{val|127.08|0.38}}

| periastron={{val|1974.927|0.026}}

| periarg={{val|309.07|0.14}}

}}

{{Starbox detail

| component1= 26 Aur A

| mass = 2.1 ± 1.0

| component2= 26 Aur B

| mass2 = 3.0 ± 0.4

}}

{{Starbox catalog

| names={{odlist|F=26 Aur|HIP=26536|GC=7002|HR=1914|ADS=4229|BD=+30°963|GSC=02404-01350|PPM=70656|HD=37269|SAO=58280|WDS=J05386+3030}}

}}

{{Starbox reference

| Simbad=26+Aur

}}

{{Starbox end}}

26 Aurigae is a binary star system in the northern constellation of Auriga. It is visible to the naked eye as a faint star with an apparent visual magnitude of 5.41.

The distance to this system remains poorly constrained. The new Hipparcos reduction gives a parallax of {{Val|5.76|6.42}}. The original Hipparcos parallax was given as {{val|7.29|0.96}},{{cite book|author1=M. A. C. Perryman|author2=European Space Agency|author3=FAST Consortium|title=The Hipparcos and Tycho catalogues: astrometric and photometric star catalogues derived from the ESA Hipparcos Space Astrometry Mission|url=https://books.google.com/books?id=qW3vAAAAMAAJ|year=1997|publisher=ESA Publications Division|isbn=978-92-9092-399-2}} leading to a distance of {{val|137.2|20.8|16.0|ul=pc}} being assumed in many texts. A distance of {{val|163|u=pc}} has been derived from fitting the spectrum.

26 Aurigae is a visual binary system, and the two stars orbit each other every 52.735 years with an ellipticity of 0.653 and an angular separation {{Val|0.154|ul=arcsecond}}. The system is made of a magnitude 6.29 G-type red giant, and a hotter magnitude 6.21 star that has been classified as an early B-type main-sequence star to an A-type subgiant star. Component A is the cool giant star, the brighter but less massive of the pair.{{cite journal|bibcode=2001AJ....122.3466M|title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog|journal=The Astronomical Journal|volume=122|issue=6|pages=3466|last1=Mason|first1=Brian D.|last2=Wycoff|first2=Gary L.|last3=Hartkopf|first3=William I.|last4=Douglass|first4=Geoffrey G.|last5=Worley|first5=Charles E.|year=2001|doi=10.1086/323920|doi-access=free}} The hotter star is sometimes listed as the primary on the basis of its stronger showing in the blended spectrum.{{cite journal|bibcode=2008ApJS..176..216A|title=Visual Multiples. IX. MK Spectral Types|journal=The Astrophysical Journal Supplement Series|volume=176|issue=1|pages=216–217|last1=Abt|first1=Helmut A.|year=2008|doi=10.1086/525529|doi-access=free}}