Gamma Eridani

γ Eridani
Location of γ Eridani (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 03h 58m 01.76695s[1]
Declination −13° 30′ 30.6698″[1]
Apparent magnitude (V) 2.88 - 2.96[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M0III-IIIb[4]
U−B color index +1.96[5]
B−V color index +1.58[5]
Variable type Lb?[2]
Astrometry
Radial velocity (Rv)60.81±0.25[6] km/s
Proper motion (μ) RA: +61.57[1] mas/yr
Dec.: −113.11[1] mas/yr
Parallax (π)17.0016 ± 0.2254 mas[7]
Distance192 ± 3 ly
(58.8 ± 0.8 pc)
Absolute magnitude (MV)−1.19[8]
Details
Mass1.55[9] M☉
Radius58.7±0.8[10] R☉
Luminosity566[9] L☉
Surface gravity (log g)1.18[9] cgs
Temperature3,875±129[9] K
Rotational velocity (v sin i)3.8[6] km/s
Other designations
Zaurac, Gamma Eridani, Gamma Eri, γ Eridani, γ Eri, 34 Eridani, 34 Eri, HD 25025, HIP 18543, HR 1231[11]
Database references
SIMBADdata

Gamma Eridani (γ Eridani, abbreviated Gamma Eri, γ Eri), formally named Zaurak /ˈzɔːræk/,[12][13] is a variable star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude that varies around 2.9, and lies at a distance of about 203 light years from the Sun, as determined by the Hipparcos astrometry satellite.

  1. ^ a b c d Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference cgcvs2007 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference eggen1992 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  7. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  8. ^ Cite error: The named reference Cardini2005 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference ayres was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference baines2021 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kunitzsch was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference IAU-CSN was invoked but never defined (see the help page).