2 Boötis
Star in the constellation Boötes
From Wikipedia, the free encyclopedia
2 Boötis is a single[7] star in the northern constellation of Boötes,[6] located 337 light years away from the Sun.[1] It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 5.63.[2] This object is moving further from the Earth with a heliocentric radial velocity of +4 km/s.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Bootes |
| Right ascension | 13h 41m 02.34661s[1] |
| Declination | +22° 29′ 44.7744″[1] |
| Apparent magnitude (V) | 5.63[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K0 III[4] |
| B−V color index | 1.009[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.00±0.16[1] km/s |
| Proper motion (μ) | RA: −17.353[1] mas/yr Dec.: −25.324[1] mas/yr |
| Parallax (π) | 9.6708±0.1033 mas[1] |
| Distance | 337 ± 4 ly (103 ± 1 pc) |
| Absolute magnitude (MV) | 0.57[2] |
| Details[5] | |
| Mass | 1.93±0.18 M☉ |
| Radius | 10.04±0.68 R☉ |
| Luminosity | 60.3+15.6 −12.4 L☉ |
| Surface gravity (log g) | 2.77±0.07 cgs |
| Temperature | 4,867±31 K |
| Metallicity [Fe/H] | −0.05±0.03 dex |
| Rotational velocity (v sin i) | 2.21±0.45 km/s |
| Age | 1.33±0.27 Gyr |
| Other designations | |
| 2 Boo, BD+23°2600, HD 119126, HIP 66763, HR 5149, SAO 82946[6] | |
| Database references | |
| SIMBAD | data |
At the age of 1.33 billion years old,[5] this is an evolved giant star with a stellar classification of K0 III,[4] having exhausted the hydrogen at its core and expanded off the main sequence. It has 1.9 times the mass of the Sun with ten times the Sun's radius. The star is radiating 60 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,867 K.[5]