20 Boötis
Star in the constellation Boötes
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20 Boötis is a single[8] 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.[1] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.154 arc seconds per annum.[9] It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[1]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 14h 19m 45.23505s[2] |
| Declination | +16° 18′ 24.9955″[2] |
| Apparent magnitude (V) | 4.84[1] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K3 III[4] |
| B−V color index | 1.228±0.001[1] |
| Astrometry | |
| Radial velocity (Rv) | −8.25±0.43[1] km/s |
| Proper motion (μ) | RA: –141.521[2] mas/yr Dec.: +60.274[2] mas/yr |
| Parallax (π) | 17.8379±0.1894 mas[2] |
| Distance | 183 ± 2 ly (56.1 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.01±0.09[5] |
| Details[5] | |
| Mass | 1.14±0.19 M☉ |
| Radius | 12.18+0.26 −0.36[2] R☉ |
| Luminosity | 51.99±0.66[2] L☉ |
| Surface gravity (log g) | 2.36±0.08 cgs |
| Temperature | 4,472 K |
| Metallicity [Fe/H] | 0.16 dex |
| Rotation | 848 days[6] |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Age | 5.21±2.28 Gyr |
| Other designations | |
| 20 Boo, NSV 6631, BD+16°2637, FK5 3135, GC 19334, GJ 3841, HD 125560, HIP 70027, HR 5370, SAO 100980[7] | |
| Database references | |
| SIMBAD | data |
This is an aging K-type giant star with a stellar classification of K3 III.[4] It is a red clump giant,[3] 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[5] times the mass of the Sun and has expanded to 12[2] times the Sun's radius. It is radiating 52[2] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,472 K.[5]