Eta Leonis

Eta Leonis
Location of η Leo (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 10h 07m 19.95186s[1]
Declination 16° 45′ 45.592″[1]
Apparent magnitude (V) 3.486[2]
Characteristics
Spectral type A0 Ib[2]
U−B color index −-0.206[2]
B−V color index −0.026[2]
Astrometry
Radial velocity (Rv)1.40[3] km/s
Proper motion (μ) RA: −2.80[1] mas/yr
Dec.: −1.82[1] mas/yr
Parallax (π)2.57 ± 0.16[1] mas
Distance1,270 ± 80 ly
(390 ± 20 pc)
Absolute magnitude (MV)-5.54[4]
Details
Mass10[5] M☉
Radius47[4] R☉
Luminosity19,000[5] L☉
Surface gravity (log g)2.00[5] cgs
Temperature9,600[2] K
Metallicity-0.04[4]
Rotational velocity (v sin i)2[2] km/s
Age25[5] Myr
Other designations
η Leo, 30 Leo, HR 3975, BD+17° 2171, HD 87737, FK5 379, HIP 49583, SAO 98955, GC 13899
Database references
SIMBADdata

Eta Leonis (η Leo, η Leonis) is a fourth-magnitude star in the constellation Leo. It doesn't have a proper name. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[6]

Properties

Eta Leonis is a white supergiant with the stellar classification A0Ib. Though its apparent magnitude is 3.5, making it a relatively dim star to the naked eye, it is nearly 20,000 times more luminous than the Sun, with an absolute magnitude of -5.60. The Hipparcos astrometric data has estimated the distance of Eta Leonis to be roughly 400 parsecs from Earth, or 1,300 light years away.

There is evidence suggesting that Eta Leonis is part of a binary star system.

References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 5 6 Firnstein, M.; Przybilla, N. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy & Astrophysics. 543: A80. arXiv:1207.0308. Bibcode:2012A&A...543A..80F. doi:10.1051/0004-6361/201219034.
  3. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  4. 1 2 3 Przybilla, N.; Butler, K.; Becker, S. R.; Kudritzki, R. P. (2006). "Quantitative spectroscopy of BA-type supergiants". Astronomy and Astrophysics. 445 (3): 1099. arXiv:astro-ph/0509669. Bibcode:2006A&A...445.1099P. doi:10.1051/0004-6361:20053832.
  5. 1 2 3 4 Tanrıverdi, Taner (2013). "Elemental abundances of the supergiant stars σ Cygnus and η Leonis". New Astronomy. 25: 50. arXiv:1512.04557. Bibcode:2013NewA...25...50T. doi:10.1016/j.newast.2013.03.013.
  6. ↑ Garrison, R. F. (December 1993), "Anchor Points for the MK System of Spectral Classification", Bulletin of the American Astronomical Society, 25: 1319, Bibcode:1993AAS...183.1710G
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