5 Aurigae

{{Short description|Triple star system in the constellation Auriga}}

{{Starbox begin}}

{{Starbox observe

| epoch=J2000

| ra={{RA|05|00|18.33887}}{{cite journal | title=Validation of the new Hipparcos reduction | 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 | s2cid=18759600 }}

| dec= {{DEC|+39|23|40.9241}}

| appmag_v={{nowrap|5.95{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }} (6.02 + 9.50){{cite journal | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | 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 | year=2001 | 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. | doi-access=free }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=B/wds/wds&WDS=07435-2825 Vizier catalog entry]}}

| constell=Auriga

}}

{{Starbox character

| class=F5 V{{cite journal | bibcode=2008ApJS..176..216A | title=Visual Multiples. IX. MK Spectral Types | journal=The Astrophysical Journal Supplement Series | volume=176 | pages=216–217 | last1=Abt | first1=Helmut A. | year=2008 | issue=1 | doi=10.1086/525529 | doi-access=free }}

| b-v = +0.42{{cite journal | doi=10.1086/130650 | title=UBV Photoelectric Photometry of 259 PZT Stars | journal=Publications of the Astronomical Society of the Pacific | volume=92 | pages=215 | year=1980 | last1=Guetter | first1=H. H. | bibcode=1980PASP...92..215G | doi-access=free }}

| u-b = −0.03

| variable=

}}

{{Starbox astrometry

| radial_v={{Val|+6.0|1.3}}{{cite journal | title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system | last1=Gontcharov | first1=G. A. | date=2006 | journal=Astronomy Letters | volume=32 | issue=11 | pages=759–771 | bibcode=2006AstL...32..759G | doi=10.1134/S1063773706110065 | arxiv=1606.08053 | s2cid=119231169 }}

| prop_mo_ra=−10.87

| prop_mo_dec=−1.08

| parallax=16.74

| p_error=0.71

| parallax_footnote=

| absmag_v = 2.07

}}

{{Starbox orbit

| reference={{cite journal | title=Orbits For Sixteen Binaries | last1=Cvetkovic | first1=Z. | last2=Novakovic | first2=B. | journal=Serbian Astronomical Journal | date=December 2006 | volume=173 | issue=173 | pages=73–82 | doi=10.2298/SAJ0673073C | bibcode=2006SerAJ.173...73C | doi-access=free }}

| period={{Val|1598.04|50.35|fmt=commas}}

| axis={{Val|5.379|0.388}}

| inclination={{Val|56.1|0.8}}

| node={{Val|155.4|0.7}}

| periastron={{Val|3242.73|8.96|fmt=commas}}

| eccentricity={{Val|0.536|0.031}}

| periarg={{Val|333.4|4.5}}

}}

{{Starbox detail

| source=

| component1=5 Aur A

| mass=1.48{{citation | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | s2cid=33401607 | postscript=. }} or 1.70

| luminosity = 12.46

| temperature = {{Val|6603|225|fmt=commas}}

| gravity = 4.14

| metal_fe = {{Val|−0.02|0.07}}{{cite journal | title=The Correlation between Metallicity and Debris Disk Mass | journal=The Astrophysical Journal | display-authors=1 | last1=Gáspár | first1=András | last2=Rieke | first2=George H | last3=Ballering | first3=Nicholas | volume=826 | issue=2 | pages=171 | year=2016 | doi=10.3847/0004-637X/826/2/171 | bibcode=2016ApJ...826..171G | arxiv=1604.07403 | s2cid=119241004 | doi-access=free }}

| age_gyr = 2.205

| component2=5 Aur B

| mass2=0.82

}}

{{Starbox catalog

| names={{odlist | CCDM=J05003+3924 | TYC=2899-369-1 | ADS=3589 | HD=31761 | PPM=69817 | WDS=J05003+3924 | BD=+39° 1133 | HIP=23261 | SAO=57559 | GC=6084 | HR=1599 }}{{cite simbad | title=5 Aur | access-date=2019-04-14 }}

}}

{{Starbox reference

| Simbad=5+Aur

}}

{{Starbox end}}

5 Aurigae is a triple star system in the northern constellation of Auriga, located about 195 light years away from the Sun based on parallax. It is just visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.95. The system is moving away from the Earth with a heliocentric radial velocity of +6 km/s, having come within {{Convert|19.14|pc|ly|disp=out|abbr=off}} some 8.7 million years ago.

This was initially discovered to be a binary star system by Otto Struve. The outer pair has an orbital period of 1,598 years with an eccentricity of 0.536. The magnitude 6.02 primary, component A, is itself a binary system consisting of two stars of similar mass, roughly 1.5 times the mass of the Sun each, with an orbital period of {{Convert|2951|days|years|abbr=off|disp=out}}.{{cite journal | bibcode=2014AJ....147...87T | doi=10.1088/0004-6256/147/4/87 | arxiv=1401.6827 | title=From Binaries to Multiples. Ii. Hierarchical Multiplicity of F and G Dwarfs | journal=The Astronomical Journal | volume=147 | issue=4 | pages=87 | year=2014 | last1=Tokovinin | first1=Andrei | s2cid=56066740 }} It has a stellar classification of F5 V, matching an F-type main-sequence star.

As of 2017, component B is a magnitude 9.50 star at an angular separation of {{Val|4.10|ul=arcsecond}} from the primary along a position angle of 285°.