1 Aurigae

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

{{Starbox begin

| name = 1 Aurigae

}}

{{Starbox image

|image=

{{Location mark

|image=Perseus constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=1 Aurigae

|x=93|y=720

}}

|caption=Location of 1 Aurigae (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Perseus

| ra = {{RA|04|49|54.63946}}{{cite journal | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | last1=Van Leeuwen | first1=F. | s2cid=18759600 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2022453 Vizier catalog entry]

| dec = {{DEC|37|29|17.7936}}

| appmag_v = 4.89{{cite journal | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | title=XHIP: An extended hipparcos compilation | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | s2cid=119257644 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=V/137D/XHIP&HIP=22453 Vizier catalog entry]

}}

{{Starbox character

| class = K3.5IIIBa0.2:{{cite journal | bibcode=1995yCat.5050....0H | title=VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) | journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H | volume=5050 | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H. | year=1995 }}

| b-v = +1.45{{cite journal | bibcode=2006yCat.2168....0M | title=VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991) | journal=VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie | volume=2168 | last1=Mermilliod | first1=J. C. | year=2006 }}[http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=II/168/ubvmeans&LID=%2B100030504 Vizier catalog entry]

| u-b = +1.71

}}

{{Starbox astrometry

| radial_v = −24.65{{cite journal | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data | journal=Astronomy & Astrophysics | volume=430 | pages=165–186 | year=2005 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | s2cid=17804304 }}

| prop_mo_ra = −36.89

| prop_mo_dec = +38.85

| parallax = 6.48

| p_error = 0.44

| parallax_footnote =

| absmag_v = −1.04

}}

{{Starbox detail

| mass = 1.49{{citation

| title=Abundances in the Local Region. I. G and K Giants

| last1=Luck | first1=R. Earle

| journal=Astronomical Journal | postscript=.

| volume=150 | issue=3 | at=88 | year=2015 | arxiv=1507.01466

| bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88 | s2cid=118505114 }}

| radius = {{Val|44|5}}{{cite journal | display-authors=1 | last1=van Belle | first1=G. T. | last2=Creech-Eakman | first2=M. J. | last3=Hart | first3=A. | title=Supergiant temperatures and linear radii from near-infrared interferometry | journal=Monthly Notices of the Royal Astronomical Society | date=2009 | volume=394 | issue=4 | pages=1925 | bibcode=2009MNRAS.394.1925V | arxiv=0811.4239 | doi=10.1111/j.1365-2966.2008.14146.x | doi-access=free | s2cid=118372600 }}

| temperature = 4,102{{cite journal | bibcode=2014AJ....147..137L | doi=10.1088/0004-6256/147/6/137 | title=Parameters and Abundances in Luminous Stars | journal=The Astronomical Journal | volume=147 | issue=6 | pages=137 | year=2014 | last1=Earle Luck | first1=R. | doi-access=free }}

| luminosity = 561

| rotational_velocity = 1.6{{cite journal | bibcode=1999A&AS..139..433D | doi=10.1051/aas:1999401 | title=A catalog of rotational and radial velocities for evolved stars | journal=Astronomy and Astrophysics Supplement Series | volume=139 | issue=3 | pages=433 | year=1999 | last1=De Medeiros | first1=J. R. | last2=Mayor | first2=M. | arxiv=astro-ph/0608248 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bAS/139/433/table5&Name=HD%2030504 Vizier catalog entry]

| gravity = 1.12

| metal_fe = −0.30

| age_gyr = 3.93

}}

{{Starbox catalog

| names = {{odlist | F=1 Aur | BD=+37°969 | FK5=1133 | HD=30504 | HIP=22453 | HR=1533 | SAO=57447 | GC=5868 }}{{cite simbad | title=1 Aur | access-date=2019-03-30 }}

}}

{{Starbox reference

| Simbad = 1+Aurigae

}}

{{Starbox end}}

1 Aurigae is the original name for a star now in the constellation Perseus. It was the first entry in John Flamsteed's catalogue of stars in Auriga. When Eugène Joseph Delporte drew up simplified boundaries for the constellations on behalf of the International Astronomical Union in 1930, 1 Aurigae ended up over the border in Perseus. To avoid confusion, the star may instead be referred to by its Harvard Revised catalogue number, HR 1533.

Based upon its parallax measurement of {{Val|6.48|ul=mas}}, this star is located approximately 520 light years from Earth. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.89. 1 Aurigae is moving closer to the Earth with a heliocentric radial velocity of −25 km/s.

This is a possible binary star system, based upon the status of the visible component as a mild barium star. The primary is an aging giant star with a stellar classification of {{nowrap|K3.5 III Ba0.2:}}. It is 3.9 billion years old with 1.49 times the mass of the Sun and around 44 times the Sun's radius. This star is radiating 561 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,102 K. The suspected companion star should be a white dwarf that previously transferred s-process elements to the visible member.