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] |
Distance | 172 ± 2 ly (52.6 ± 0.5 pc) |
Absolute magnitude (MV) | 1.03[2] |
Details | |
Mass | 1.59[4] M☉ |
Radius | 2.1[5] R☉ |
Luminosity | 34.6+0.9 −1.0[6] L☉ |
Surface gravity (log g) | 3.77±0.14[4] cgs |
Temperature | 7,614±259[4] K |
Metallicity [Fe/H] | −0.20[7] dex |
Rotational velocity (v sin i) | 105[6] km/s |
Age | 513[4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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]
vanLeeuwen2007
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