Gamma Lyrae

Gamma Lyrae
Location of γ Lyrae
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 18h 58m 56.62241s[1]
Declination +32° 41′ 22.4003″[1]
Apparent magnitude (V) 3.24[2]
Characteristics
Spectral type B9 III[3]
U−B color index –0.125[4]
B−V color index –0.04[2]
Astrometry
Radial velocity (Rv)–21.1[5] km/s
Proper motion (μ) RA: –3.09[1] mas/yr
Dec.: +1.11[1] mas/yr
Parallax (π)5.26 ± 0.27 mas[1]
Distance620 ± 30 ly
(190 ± 10 pc)
Absolute magnitude (MV)−3.14[6]
Details
Mass5.76[7] M☉
Radius13.28±1.15[2] R☉
Luminosity2,430[7] L☉
Surface gravity (log g)3.5±0.25[2] cgs
Temperature11000±100[2] K
Metallicity [Fe/H]+0.15[7] dex
Rotational velocity (v sin i)65[2] km/s
Other designations
Sulafat, Gamma Lyrae, γ Lyr, γ Lyrae, 14 Lyr, BD+32° 3286, FK5 713, HD 176437, HIP 93194, HR 7178, SAO 67663[8]
Database references
SIMBADdata

Gamma Lyrae, Latinised from γ Lyrae, and formally named Sulafat /ˈsuːləfæt/,[9][10] is the second-brightest star in the northern constellation of Lyra. With an apparent visual magnitude of 3.3,[4] it is readily visible to the naked eye. Parallax measurements yield an estimated distance of 620 light-years (190 parsecs) from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.12±0.03 due to interstellar dust.[7]

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference gordon2019 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aaass65_2_405 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference challouf2014 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  10. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.