Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 26m 27.36529s [1] |
Declination | +19° 13′ 36.8470″ [1] |
Apparent magnitude (V) | 5.40 [2] |
Characteristics | |
Spectral type | kA7 hA8 mF2 (III) ((Sr II)) [3] |
B−V color index | 0.231±0.006 [2] |
Astrometry | |
Radial velocity (Rv) | −27.4±0.5 [2] km/s |
Proper motion (μ) |
RA: –70.131
[1]
mas/
yr Dec.: +26.084 [1] mas/ yr |
Parallax (π) | 10.2279 ± 0.1491 mas [1] |
Distance | 319 ± 5
ly (98 ± 1 pc) |
Absolute magnitude (MV) | 0.65 [2] |
Details | |
Mass | 1.99±0.02 [4] M☉ |
Radius | 4.03+0.23 −0.26 [1] R☉ |
Luminosity | 52.43±0.89 [1] L☉ |
Surface gravity (log g) | 3.13±0.52 [4] cgs |
Temperature | 7,528+277 −207 [1] K |
Metallicity [Fe/H] | +0.36±0.04 [2] dex |
Rotational velocity (v sin i) | 37.74±2.12 [2] km/s |
Other designations | |
Database references | |
SIMBAD | data |
22 Boötis is a single [6] star in the northern constellation of Boötes, [5] located 319 light years away from the Sun. [1] It has the Bayer designation f Boötis; 22 Boötis is the Flamsteed designation. [5] This object is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.40. [2] It is moving closer to the Earth with a heliocentric radial velocity of −27 km/s. [2]
This is an Am star [7] with a stellar classification of kA7 hA8 mF2 (III) ((Sr II)), [3] showing the calcium K line of an A7 star, the hydrogen lines of an A8 star, and the metal lines of an F2 star. It has the luminosity class of a giant star and does not appear to be variable. [7] The star has twice [4] the mass of the Sun and four [1] times the Sun's radius. It is spinning with a projected rotational velocity of 38 [2] km/s. 22 Boötis is radiating 52 [1] times the Sun's luminosity from its photosphere at an effective temperature of 7,528 K. [1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 26m 27.36529s [1] |
Declination | +19° 13′ 36.8470″ [1] |
Apparent magnitude (V) | 5.40 [2] |
Characteristics | |
Spectral type | kA7 hA8 mF2 (III) ((Sr II)) [3] |
B−V color index | 0.231±0.006 [2] |
Astrometry | |
Radial velocity (Rv) | −27.4±0.5 [2] km/s |
Proper motion (μ) |
RA: –70.131
[1]
mas/
yr Dec.: +26.084 [1] mas/ yr |
Parallax (π) | 10.2279 ± 0.1491 mas [1] |
Distance | 319 ± 5
ly (98 ± 1 pc) |
Absolute magnitude (MV) | 0.65 [2] |
Details | |
Mass | 1.99±0.02 [4] M☉ |
Radius | 4.03+0.23 −0.26 [1] R☉ |
Luminosity | 52.43±0.89 [1] L☉ |
Surface gravity (log g) | 3.13±0.52 [4] cgs |
Temperature | 7,528+277 −207 [1] K |
Metallicity [Fe/H] | +0.36±0.04 [2] dex |
Rotational velocity (v sin i) | 37.74±2.12 [2] km/s |
Other designations | |
Database references | |
SIMBAD | data |
22 Boötis is a single [6] star in the northern constellation of Boötes, [5] located 319 light years away from the Sun. [1] It has the Bayer designation f Boötis; 22 Boötis is the Flamsteed designation. [5] This object is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.40. [2] It is moving closer to the Earth with a heliocentric radial velocity of −27 km/s. [2]
This is an Am star [7] with a stellar classification of kA7 hA8 mF2 (III) ((Sr II)), [3] showing the calcium K line of an A7 star, the hydrogen lines of an A8 star, and the metal lines of an F2 star. It has the luminosity class of a giant star and does not appear to be variable. [7] The star has twice [4] the mass of the Sun and four [1] times the Sun's radius. It is spinning with a projected rotational velocity of 38 [2] km/s. 22 Boötis is radiating 52 [1] times the Sun's luminosity from its photosphere at an effective temperature of 7,528 K. [1]