Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 14m 50.85024s [1] |
Declination | +10° 06′ 02.1964″ [1] |
Apparent magnitude (V) | 5.45 (5.51 + 8.53) [2] |
Characteristics | |
Spectral type | K1 III [3] |
B−V color index | 1.007±0.003 [4] |
Astrometry | |
Radial velocity (Rv) | +16.80±0.40 [4] km/s |
Proper motion (μ) |
RA: −20.83
[1]
mas/
yr Dec.: −164.41 [1] mas/ yr |
Parallax (π) | 12.31 ± 0.59 mas [1] |
Distance | 260 ± 10
ly (81 ± 4 pc) |
Absolute magnitude (MV) | 0.75 [4] |
Details | |
Mass | 1.48±0.42 [5] M☉ |
Radius | 10 [6] R☉ |
Luminosity | 61.08 [4] L☉ |
Surface gravity (log g) | 2.55±0.11 [5] cgs |
Temperature | 4,845±92 [5] K |
Metallicity [Fe/H] | −0.26 [7] dex |
Rotational velocity (v sin i) | 0.0 [6] km/s |
Age | 2.0+0.8 −0.6 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
15 Boötis is a binary star [2] system in the northern constellation of Boötes, [8] located approximately 260 light years away from the Sun. [1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45. [2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum. [9] It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s. [4]
The magnitude 5.51 [2] primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III. [3] It is a red clump giant, [7] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two [5] billion years old with 1.5 [5] times the mass of the Sun and has expanded to 10 [6] times the Sun's radius. The star is radiating 61 [4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K. [5]
Its companion, component B, is a magnitude +8.53 star [2] was located at an angular separation of 0.80 ″ along a position angle of 111° from the primary, as of 2015. This is the same separation it had when the system was discovered in 1936. [10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 14m 50.85024s [1] |
Declination | +10° 06′ 02.1964″ [1] |
Apparent magnitude (V) | 5.45 (5.51 + 8.53) [2] |
Characteristics | |
Spectral type | K1 III [3] |
B−V color index | 1.007±0.003 [4] |
Astrometry | |
Radial velocity (Rv) | +16.80±0.40 [4] km/s |
Proper motion (μ) |
RA: −20.83
[1]
mas/
yr Dec.: −164.41 [1] mas/ yr |
Parallax (π) | 12.31 ± 0.59 mas [1] |
Distance | 260 ± 10
ly (81 ± 4 pc) |
Absolute magnitude (MV) | 0.75 [4] |
Details | |
Mass | 1.48±0.42 [5] M☉ |
Radius | 10 [6] R☉ |
Luminosity | 61.08 [4] L☉ |
Surface gravity (log g) | 2.55±0.11 [5] cgs |
Temperature | 4,845±92 [5] K |
Metallicity [Fe/H] | −0.26 [7] dex |
Rotational velocity (v sin i) | 0.0 [6] km/s |
Age | 2.0+0.8 −0.6 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
15 Boötis is a binary star [2] system in the northern constellation of Boötes, [8] located approximately 260 light years away from the Sun. [1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45. [2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum. [9] It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s. [4]
The magnitude 5.51 [2] primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III. [3] It is a red clump giant, [7] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two [5] billion years old with 1.5 [5] times the mass of the Sun and has expanded to 10 [6] times the Sun's radius. The star is radiating 61 [4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K. [5]
Its companion, component B, is a magnitude +8.53 star [2] was located at an angular separation of 0.80 ″ along a position angle of 111° from the primary, as of 2015. This is the same separation it had when the system was discovered in 1936. [10]