Psi9 Aurigae

For other stars with a similar Bayer designation, see ψ Aurigae.
Psi9 Aurigae
Location of ψ9 Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 06h 56m 32.05791s[1]
Declination +46° 16′ 26.3867″[1]
Apparent magnitude (V) 5.75[2]
Characteristics
Spectral type B8 IIIe[3]
U−B color index –0.46[4]
B−V color index –0.06[4]
Astrometry
Radial velocity (Rv)–41.1[5] km/s
Proper motion (μ) RA: –2.93[1] mas/yr
Dec.: +4.07[1] mas/yr
Parallax (π)2.59 ± 0.38 mas[1]
Distanceapprox. 1,300 ly
(approx. 390 pc)
Absolute magnitude (MV)−2.03[6]
Details
Radius3.7[2] R☉
Luminosity868[6] L☉
Rotational velocity (v sin i)235[7] km/s
Other designations
ψ9 Aur, BD+46 1203, HD 50658, HIP 33377, HR 2568, SAO 41446[8]
Database references
SIMBADdata

Psi9 Aurigae, Latinised from ψ9 Aurigae, is a star in the northern constellation of Auriga. It is dimly visible to the naked eye with an apparent visual magnitude of 5.75.[2] Based upon an annual parallax shift of 2.59 mas,[1] the distance to this star is approximately 1,300 light-years (400 parsecs).

The spectrum of Psi9 Aurigae matches a giant star with a stellar classification of B8 IIIe.[3] The 'e' suffix indicates this is a Be star that shows emission lines of hydrogen in its spectrum. This is caused by a circumstellar shell of hot gas. The emission undergoes variability on a time scale of sixteen years.[3]

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  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
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