Psi1 Aurigae

For other stars with this Bayer designation, see ψ Aurigae.
Psi1 Aurigae
Location of ψ1 Aurigae (circled)
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]
Distance6,590+1,382
−1,174 ly
(2,021.5+424
−360 pc)[6]
Absolute magnitude (MV)−5.53[7]
Details
Mass14.4 ± 0.8[8] M☉
Radius934[9] – 1,004[10][a] R☉
Luminosity170,400[9] L☉
Temperature3,790[9] K
Metallicity [Fe/H]+0.08[11] dex
Age12.3 ± 0.4[8] Myr
Other designations
46 Aurigae, BD+49 1488, FK5 242, HD 44537, HIP 30520, HR 2289, SAO 41076[12]
Database references
SIMBADdata

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]

A visual band light curve for Psi1 Aurigae, adapted from Percy et al. (2001)[13]

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] It is one of the largest stars known, even larger and more luminous than well-known red supergiants Betelgeuse and Antares. 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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  2. ^ a b c d Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
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  8. ^ a b c Cite error: The named reference mnras410_1_190 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference healy was invoked but never defined (see the help page).
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  11. ^ Cite error: The named reference jrasc65_222 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Percy was invoked but never defined (see the help page).


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