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Psi1 Aurigae
Star in the constellation Auriga / From Wikipedia, the free encyclopedia
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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]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/97/Psi1AurLightCurve.png/640px-Psi1AurLightCurve.png)
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][lower-alpha 1] 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 | |
Database references | |
SIMBAD | data |
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.