Global InformationPsi1 Aurigae information
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 24m 53.90155s[1] |
| Declination | +49° 17′ 16.4112″[1] |
| Apparent magnitude (V) | 4.91[2] |
| Characteristics | |
| Evolutionary stage | Red supergiant |
| Spectral type | K5-M1Iab-Ib[3] |
| U−B color index | +2.29[2] |
| B−V color index | +1.97[2] |
| R−I color index | 1.07 |
| Variable type | LC[4] |
| Astrometry | |
| Radial velocity (Rv) | +4.7[5] km/s |
| Proper motion (μ) | RA: –0.155[1] mas/yr Dec.: –2.131[1] mas/yr |
| Parallax (π) | 0.4426 ± 0.1103 mas[1] |
| Distance | 6,590+1,382 −1,174 ly (2,021.5+424 −360 pc)[6] |
| Absolute magnitude (MV) | −5.53[7] |
| Details | |
| Mass | 14.4 ± 0.8[8] M☉ |
| Radius | 934[9] – 1,004[10][a] R☉ |
| Luminosity | 170,400[9] L☉ |
| Temperature | 3,790[9] K |
| Metallicity [Fe/H] | +0.08[11] dex |
| Age | 12.3 ± 0.4[8] Myr |
| Other designations | |
46 Aurigae, BD+49 1488, FK5 242, HD 44537, HIP 30520, HR 2289, SAO 41076[12] | |
| Database references | |
| SIMBAD | data |
Psi1 Aurigae (ψ1 Aur, ψ1 Aurigae) is a star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.91.[2] Based upon a measured annual parallax shift of 0.44 mas,[1] it is approximately 7,500 light-years (2,300 parsecs) distant from the Earth. It is receding from the Sun with a radial velocity of +4.7 km/s.[5]
This is a massive supergiant star with a stellar classification of K5-M1Iab-Ib.[3] It is a slow irregular variable of the LC type, with its brightness varying in magnitude by 0.44.[4] The star is more than 14[8] times as massive as the Sun, over 900 times larger, and is blazing with 170,000 times the Sun's luminosity.[9] This energy is being radiated into outer space from its outer atmosphere at an effective temperature of 3,790 K,[9] giving it the orange-red hue of a cool M-type star.
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