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Star in the constellation Boötes From Wikipedia, the free encyclopedia
20 Boötis is a single[7] star in the northern constellation of Boötes, located 183 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.84.[2] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.154 arc seconds per annum.[8] It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[2]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 19m 45.23505s[1] |
Declination | +16° 18′ 24.9955″[1] |
Apparent magnitude (V) | 4.84[2] |
Characteristics | |
Spectral type | K3 III[3] |
B−V color index | 1.228±0.001[2] |
Astrometry | |
Radial velocity (Rv) | −8.25±0.43[2] km/s |
Proper motion (μ) | RA: –141.521[1] mas/yr Dec.: +60.274[1] mas/yr |
Parallax (π) | 17.8379 ± 0.1894 mas[1] |
Distance | 183 ± 2 ly (56.1 ± 0.6 pc) |
Absolute magnitude (MV) | 1.01±0.09[4] |
Details[4] | |
Mass | 1.14±0.19 M☉ |
Radius | 12.18+0.26 −0.36[1] R☉ |
Luminosity | 51.99±0.66[1] L☉ |
Surface gravity (log g) | 2.36±0.08 cgs |
Temperature | 4,472 K |
Metallicity [Fe/H] | 0.16 dex |
Rotation | 848 days[5] |
Rotational velocity (v sin i) | 1.0[5] km/s |
Age | 5.21±2.28 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging K-type giant star with a stellar classification of K3 III.[3] It is a red clump giant,[9] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is around five billion years old with 1.1[4] times the mass of the Sun and has expanded to 12[1] times the Sun's radius. It is radiating 52[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,472 K.[4]
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