Eta Lyrae

Eta Lyrae
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 19h 13m 45.48832s[1]
Declination +39° 08′ 45.4801″[1]
Apparent magnitude (V) 4.40[2]
Characteristics
Spectral type B2.5IV
Astrometry
Radial velocity (Rv)-8.1 ± 0.9[1] km/s
Parallax (π)2.35 ± 0.13[1] mas
Distance1,390 ± 80 ly
(430 ± 20 pc)
Details
Other designations
20 Lyr, HD 180163, HIP 94481, HR 7298, SAO 68010.[2]

Eta Lyrae (η Lyr, η Lyrae) is a star in the constellation Lyra. It has the traditional name Aladfar, from the Arabic الأظفر al-’uz̧fur "the talons (of the swooping eagle)", a name it shares with Mu Lyrae (though the latter is typically spelled Alathfar in English).

Eta Lyrae belongs to spectral class B2.5IV and has apparent magnitude of +4.40.[2] It is approximately 1390 light years from Earth.[1]

References

  1. 1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 SIMBAD, Eta Lyrae (accessed 25 July 2015)


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