6 Lacertae

6 Lacertae
Observation data
Epoch J2000      Equinox J2000
Constellation Lacerta
Right ascension 22h 30m 29.26005s[1]
Declination +43° 07′ 24.1565″[1]
Apparent magnitude (V) 4.52[2]
Characteristics
Spectral type B2 IV[3]
B−V color index −0.086±0.018[2]
Astrometry
Radial velocity (Rv)−8.7±0.9[2] km/s
Proper motion (μ) RA: −4.800[1] mas/yr
Dec.: −2.598[1] mas/yr
Parallax (π)1.7577 ± 0.2697 mas[1]
Distanceapprox. 1,900 ly
(approx. 570 pc)
Absolute magnitude (MV)−2.62[4]
Orbit[5]
Period (P)880 days
Eccentricity (e)0.30
Periastron epoch (T)2,416,300 JD
Argument of periastron (ω)
(secondary)		190°
Semi-amplitude (K1)
(primary)		9 km/s
Details
Mass12.5±0.6[6] M☉
Radius6.9[7] R☉
Luminosity (bolometric)34,590[8] L☉
Surface gravity (log g)3.56[9] cgs
Temperature21,150[8] K
Metallicity [Fe/H]−0.04[9] dex
Rotational velocity (v sin i)70[10] km/s
Age15.7±0.1[6] Myr
Other designations
6 Lac, BD+42° 4420, FK5 3800, HD 213420, HIP 111104, HR 8579, SAO 52079[11]
Database references
SIMBADdata

6 Lacertae is a binary star[5] system in the northern constellation of Lacerta, located around 1,900 light years from the Sun.[1] It is visible to the naked eye as a dim, blue-white hued star with a combined apparent visual magnitude of 4.52.[2] The system is moving closer to the Earth with a heliocentric radial velocity of −9 km/s,[2] and is a suspected member of the Lac OB1 association.[4]

This system forms a single-lined spectroscopic binary with an orbital period of 880 days and an eccentricity of 0.3.[5] The visible component has a stellar classification of B2 IV,[3] matching a B-type subgiant star. It is about 16[6] million years old with a relatively high projected rotational velocity of 70 km/s.[10] The star has 12.5[6] times the mass of the Sun and about 7[7] times the Sun's radius. It is radiating a net 34,590[8] times the Sun's luminosity from its photosphere at an effective temperature of 21,150 K.[8]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Lesh1968 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Kaltcheva2009 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Beardsley1969 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gies1992 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Strom2005 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).