Iota Lyrae

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Iota Lyrae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 07m 18.13s[1]
Declination +36° 06′ 00.6″[1]
Apparent magnitude (V) 5.22[2]
Spectral type B6IV + ?[2]
Radial velocity (Rv)−26.00±4.6[3] km/s
Proper motion (μ) RA: −1.04±0.16[1] mas/yr
Dec.: −4.29±0.20[1] mas/yr
Parallax (π)3.64 ± 0.20[1] mas
Distance900 ± 50 ly
(270 ± 20 pc)
Absolute magnitude (MV)−1.94[4]
Period (P)216.93 yr
Semi-major axis (a)0.172″
Eccentricity (e)0.637
Inclination (i)145.5°
Longitude of the node (Ω)171.4°
Periastron epoch (T)B 1997.28
Argument of periastron (ω)
Luminosity956[4] L
Other designations
Iota Lyrae, 18 Lyrae, BD+35°3485, HD 178475, HIP 93903, HR 7262, SAO 67834, GC 26338, GSC 02652-01709
Database references

ι Lyrae, Latinised as Iota Lyrae, is a binary star in the constellation Lyra. Its apparent magnitude is 5.22.[2] Located around 275 parsecs (900 ly) distant,[1] it is composed of a blue subgiant primary of spectral type B6IV and an unknown secondary separated by 0.08 arcseconds.[2]


  1. ^ a b c d e f van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c d Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  3. ^ Gontcharov, G. A. (November 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.
  4. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  5. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 15 March 2017.