9 Lacertae

9 Lacertae
Observation data
Epoch J2000      Equinox J2000
Constellation Lacerta
Right ascension 22h 37m 22.41727s[1]
Declination +51° 32′ 42.4383″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Evolutionary stage main sequence
Spectral type A9VkA7mA6[3]
B−V color index 0.254±0.006[2]
Astrometry
Radial velocity (Rv)+10.1±1.5[2] km/s
Proper motion (μ) RA: −51.83[1] mas/yr
Dec.: −103.80[1] mas/yr
Parallax (π)19.00 ± 0.19 mas[1]
Distance172 ± 2 ly
(52.6 ± 0.5 pc)
Absolute magnitude (MV)1.03[2]
Details
Mass1.59[4] M☉
Radius2.1[5] R☉
Luminosity34.6+0.9
−1.0[6] L☉
Surface gravity (log g)3.77±0.14[4] cgs
Temperature7,614±259[4] K
Metallicity [Fe/H]−0.20[7] dex
Rotational velocity (v sin i)105[6] km/s
Age513[4] Myr
Other designations
9 Lac, BD+50° 3770, HD 214454, HIP 111674, HR 8613, SAO 34628[8]
Database references
SIMBADdata

9 Lacertae is a single[9] star in the northern constellation Lacerta, located 172 light years away from Sun.[1] It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.64.[2] This object is moving further from the Earth with a heliocentric radial velocity of +10 km/s.[2]

This is an A-type main-sequence star with a stellar classification of A9VkA7mA6.[3] This notation indicates it has the Hydrogen lines of an A9 star, the Calcium K line of an A7 star, and the metal lines of an A6. It is 513[4] million years old with a high projected rotational velocity of 105 km/s.[6] The star has 1.59[4] times the mass of the Sun and about 2.1[5] times the Sun's radius. It is radiating 34.6[6] times the Sun's luminosity from its photosphere at an effective temperature of 7,614 K.[4]

  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 e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference gray2001 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Erspamer2003 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. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).