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