Zeta1 Lyrae

For other stars with this Bayer designation, see ζ Lyrae.
ζ1 Lyrae
Location of ζ Lyrae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lyra
Right ascension 18h 44m 46.35735s[1]
Declination +37° 36′ 18.4171″[1]
Apparent magnitude (V) 4.37[2]
Characteristics
Spectral type kA5hF0mF2[3]
U−B color index +0.17[2]
B−V color index +0.18[2]
Astrometry
Proper motion (μ) RA: +29.04[1] mas/yr
Dec.: +27.03[1] mas/yr
Parallax (π)20.89 ± 0.17 mas[1]
Distance156 ± 1 ly
(47.9 ± 0.4 pc)
Absolute magnitude (MV)+0.94[4]
Orbit[5]
Period (P)4.3 d
Eccentricity (e)0.01
Periastron epoch (T)2440000.723 JD
Argument of periastron (ω)
(secondary)		0.00°
Semi-amplitude (K1)
(primary)		51.6 km/s
Details
Mass2.36[6] M☉
Radius2.5[7] R☉
Luminosity31[8] L☉
Surface gravity (log g)3.7±0.1[9] cgs
Temperature7914±112[9] K
Metallicity [Fe/H]0.38±0.06[9] dex
Rotational velocity (v sin i)47[10] km/s
Age500[6] Myr
Other designations
ζ1 Lyr, 6 Lyr, BD+37°3222, HD 173648, HIP 91971, HR 7056, SAO 67321.[11]
Database references
SIMBADdata

Zeta1 Lyrae, Latinized from ζ1 Lyrae, is a binary star in the northern constellation of Lyra. Based upon an annual parallax shift of 20.89 mas as seen from Earth,[1] the pair are located about 156 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of 4.37.[2]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference abt was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference DeRosa2014 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Prugniel2011 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Royer2002 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).