Psi9 Aurigae
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| 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[1] mas |
| Distance | approx. 1,300 ly (approx. 390 pc) |
| Details | |
| Radius | 3.7[2] R☉ |
| Rotational velocity (v sin i) | 235[6] km/s |
| Other designations | |
Psi9 Aurigae (ψ9 Aur, ψ9 Aurigae) is the Bayer designation for 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]
References
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