Psi4 Aurigae

For other stars with this Bayer designation, see ψ Aurigae.
Psi4 Aurigae
Location of ψ4 Aurigae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Right ascension 06h 43m 04.97107s[1]
Declination +44° 31′ 28.0220″[1]
Apparent magnitude (V) +5.02[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.83[2]
B−V color index +1.48[2]
Astrometry
Radial velocity (Rv)−77.35±0.23[4] km/s
Proper motion (μ) RA: −45.43[1] mas/yr
Dec.: −29.97[1] mas/yr
Parallax (π)10.08 ± 0.33 mas[1]
Distance320 ± 10 ly
(99 ± 3 pc)
Absolute magnitude (MV)+0.06[5]
Details
Radius24.9[6] R☉
Luminosity155[6] L☉
Surface gravity (log g)2.04±0.24[7] cgs
Temperature4,085±125[6] K
Metallicity [Fe/H]0.10±0.08[7] dex
Rotational velocity (v sin i)4.8[4] km/s
Other designations
ψ4 Aur, 55 Aurigae, BD+44° 1518, FK5 2517, HD 47914, HIP 32173, HR 2459, SAO 41288[8]
Database references
SIMBADdata

Psi4 Aurigae, Latinized from ψ4 Aurigae, is a single,[9] orange-hued star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of +5.02.[2] With an annual parallax shift of 10.08 ± 0.33 mas,[1] it is approximately 324 light-years (99 parsecs) distant from Earth.

This is a K-type giant star with a stellar classification of K5 III.[3] It has expanded to 25 times the Sun's radius and is radiating 155 times the Sun's luminosity from its photosphere at an effective temperature of about 4,158 K.[6] The atmosphere displays a significant enhancement of silicon.[10]

It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Roman1952 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference tycho-gaia was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Prugniel2011 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Franchini2004 was invoked but never defined (see the help page).