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51 Eridani

51 Eridani

51 Eridani and its planet 51 Eridani b
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 04h 37m 36.13234s[1]
Declination −02° 28′ 24.7749″[1]
Apparent magnitude (V) 5.22[2]
Characteristics
Spectral type F0 V[2]
Variable type γ Dor[3]
Astrometry
Radial velocity (Rv)12.60±0.3[4] km/s
Proper motion (μ) RA: 44.22 ± 0.34[1] mas/yr
Dec.: –64.39 ± 0.27[1] mas/yr
Parallax (π)33.98 ± 0.34 mas[1]
Distance96.0 ± 1.0 ly
(29.4 ± 0.3 pc)
Absolute magnitude (MV)2.87[5]
Details
51 Eri A
Mass1.550+0.006
−0.005[6] M☉
Radius1.45±0.02[6] R☉
Luminosity5.72±0.096[6] L☉
Surface gravity (log g)3.95±0.04[7] cgs
Temperature7,422±58[6] K
Metallicity [Fe/H]−0.12±0.06[7] dex
Rotational velocity (v sin i)77.9[8] km/s
Age23.2+1.7
−2.0[6] Myr
Other designations
c Eridani, 51 Eridani, BD−02° 963, HD 29391, HIP 21547, HR 1474, SAO 131358, 2MASS J04373613-0228248
Database references
SIMBADdata

51 Eridani is a star in the constellation Eridanus. It has an apparent magnitude of 5.22,[2] meaning it is just visible to the unaided eye in suburban and rural skies.[9] The primary star's absolute magnitude is 2.87.[5] There is also a binary star named GJ 3305 which shares the same proper motion through space with it,[10] making it overall a triple star system.

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Simon, M.; Schaefer, G. H. (2011). "Measured Diameters Of Two F Stars In The β Pic Moving Group". The Astrophysical Journal. 743 (2): 158. arXiv:1109.3483. Bibcode:2011ApJ...743..158S. doi:10.1088/0004-637X/743/2/158. S2CID 16107676.
  3. ^ Cite error: The named reference Sepulveda_et_al_2022 was invoked but never defined (see the help page).
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  5. ^ a b Mamajek, Eric E.; Bell, Cameron P. M. (2014). "On the age of the β Pictoris moving group". Monthly Notices of the Royal Astronomical Society. 445 (3): 2169–80. arXiv:1409.2737. Bibcode:2014MNRAS.445.2169M. doi:10.1093/mnras/stu1894.
  6. ^ a b c d e Elliott, Ashley; Boyajian, Tabetha; Ellis, Tyler; von Braun, Kaspar; Mann, Andrew W.; Schaefer, Gail (2024). "Measuring the stellar and planetary parameters of the 51 Eridani system". Publications of the Astronomical Society of Australia. 41. arXiv:2401.01468. doi:10.1017/pasa.2024.40.
  7. ^ a b Cite error: The named reference Rajan2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Paunzen2014 was invoked but never defined (see the help page).
  9. ^ Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 14 October 2021.
  10. ^ Cite error: The named reference Montet was invoked but never defined (see the help page).

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