Pi Aurigae

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Template:Short description

Pi Aurigae
Template:Location mark
The location of π Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.25[3]
Characteristics
Evolutionary stage asymptotic giant branch[4]
Spectral type M3 IIb[5]
U−B Template:Engvar +1.83[3]
B−V Template:Engvar +1.72[3]
Variable type LC[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[7] km/s
Proper motion (μ) RA: −3.755 mas/yr[2]
Dec.: −7.785 mas/yr[2]
Parallax (π)4.515±0.241 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−2.46[1]
Details
Mass2.98[8] Template:Solar mass
Radius218.6[9] Template:Solar radius
LuminosityScript error: No such module "val".[9] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[10] cgs
TemperatureScript error: No such module "val".[9] K
Metallicity [Fe/H]Script error: No such module "val".[10] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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File:Pi Aurigae.jpg
π Aurigae (center) in optical light

Pi Aurigae is a single,[12] red-hued star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from π Aurigae, and abbreviated Pi Aur or π Aur. Located about one degree north of the 2nd magnitude star Beta Aurigae,[13] Pi Aurigae is visible to the naked eye with an apparent visual magnitude of 4.25[3] Based upon parallax measurements, it is approximately Script error: No such module "convert". away from Earth.[2] At that distance, the brightness of the star is diminished by 0.54 in magnitude from extinction caused by interstellar gas and dust.[7]

Pi Aurigae is an evolved bright giant star with a stellar classification of M3 IIb.[5] After exhausting the supply of hydrogen at its core the star has expanded to approximately 219 times the size of the Sun.[9] It is classified as a slow irregular variable of type LC and its brightness varies from magnitude +4.24 to +4.34.[6] On average, the star is radiating 6,630 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,525 K.[9]

References

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  1. ↑ a b Template:Cite XHIP
  2. ↑ a b c d e Template:Cite DR3
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b c d e Script error: No such module "citation/CS1". Pi Aurigae's database entry at VizieR.
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Auriga

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