Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 19m 16.27966s [1] |
Declination | +13° 00′ 15.4859″ [1] |
Apparent magnitude (V) | 5.41 [2] |
Characteristics | |
Spectral type | F3 V [3] |
B−V color index | 0.385±0.011 [2] |
Astrometry | |
Radial velocity (Rv) | −0.40±0.7 [2] km/s |
Proper motion (μ) |
RA: +105.273
[1]
mas/
yr Dec.: −31.389 [1] mas/ yr |
Parallax (π) | 38.1262 ± 0.1323 mas [1] |
Distance | 85.5 ± 0.3
ly (26.23 ± 0.09 pc) |
Absolute magnitude (MV) | 3.33 [2] |
Details | |
Mass | 1.31 [4] M☉ |
Radius | 1.4 [5] R☉ |
Luminosity | 3.90 [2] L☉ |
Surface gravity (log g) | 4.30 [4] cgs |
Temperature | 6,731±229 [4] K |
Metallicity [Fe/H] | −0.03±0.04 [6] dex |
Rotational velocity (v sin i) | 40.5±2.0 [7] km/s |
Age | 1.154 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
18 Boötis is a single [9] star in the northern constellation of Boötes, [8] located about 85 light years away from the Sun. [1] It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 5.41. [2] This object is a suspected member of the Ursa Major Moving Group, based on velocity criteria. [10] It has a magnitude 10.84 optical companion at an angular separation of 163.7 ″ along a position angle of 219°, as of 2010. [11]
This is an F-type main-sequence star with a stellar classification of F3 V. [3] Older surveys gave a class of F5 IV, [12] showing the luminosity class of a subgiant star. It shows strong evidence for short-term chromospheric variability, although it is not optically variable. [13]
18 Boötis is an estimated 1.15 [4] billion years old and is spinning with a projected rotational velocity of 40.5 km/s. [7] It has 1.3 [4] times the mass of the Sun and 1.4 [5] times the Sun's radius. The star is radiating 3.9 [2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,731 K. [4] An infrared excess has been detected that suggests a cold debris disk is orbiting 34.9 AU from the host star with a blackbody temperature fit of 65 K. [5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 19m 16.27966s [1] |
Declination | +13° 00′ 15.4859″ [1] |
Apparent magnitude (V) | 5.41 [2] |
Characteristics | |
Spectral type | F3 V [3] |
B−V color index | 0.385±0.011 [2] |
Astrometry | |
Radial velocity (Rv) | −0.40±0.7 [2] km/s |
Proper motion (μ) |
RA: +105.273
[1]
mas/
yr Dec.: −31.389 [1] mas/ yr |
Parallax (π) | 38.1262 ± 0.1323 mas [1] |
Distance | 85.5 ± 0.3
ly (26.23 ± 0.09 pc) |
Absolute magnitude (MV) | 3.33 [2] |
Details | |
Mass | 1.31 [4] M☉ |
Radius | 1.4 [5] R☉ |
Luminosity | 3.90 [2] L☉ |
Surface gravity (log g) | 4.30 [4] cgs |
Temperature | 6,731±229 [4] K |
Metallicity [Fe/H] | −0.03±0.04 [6] dex |
Rotational velocity (v sin i) | 40.5±2.0 [7] km/s |
Age | 1.154 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
18 Boötis is a single [9] star in the northern constellation of Boötes, [8] located about 85 light years away from the Sun. [1] It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 5.41. [2] This object is a suspected member of the Ursa Major Moving Group, based on velocity criteria. [10] It has a magnitude 10.84 optical companion at an angular separation of 163.7 ″ along a position angle of 219°, as of 2010. [11]
This is an F-type main-sequence star with a stellar classification of F3 V. [3] Older surveys gave a class of F5 IV, [12] showing the luminosity class of a subgiant star. It shows strong evidence for short-term chromospheric variability, although it is not optically variable. [13]
18 Boötis is an estimated 1.15 [4] billion years old and is spinning with a projected rotational velocity of 40.5 km/s. [7] It has 1.3 [4] times the mass of the Sun and 1.4 [5] times the Sun's radius. The star is radiating 3.9 [2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,731 K. [4] An infrared excess has been detected that suggests a cold debris disk is orbiting 34.9 AU from the host star with a blackbody temperature fit of 65 K. [5]