| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 15h 14m 29.159s[2] |
| Declination | +29° 09′ 51.47″[2] |
| Apparent magnitude (V) | 5.28[1] |
| Characteristics | |
| Spectral type | A2 V[3] |
| U−Bcolor index | +0.08[4] |
| B−Vcolor index | +0.02[4] |
| Astrometry | |
| Radial velocity (Rv) | −16.0±0.8[5] km/s |
| Proper motion (μ) | RA: −69.512mas/yr[2] Dec.: +28.662mas/yr[2] |
| Parallax (π) | 13.3668±0.0584 mas[2] |
| Distance | 244 ± 1 ly (74.8 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.84[1] |
| Details | |
| Mass | 2.09[6] M☉ |
| Radius | 2.24[7] R☉ |
| Luminosity | 36.8[8] L☉ |
| Surface gravity (log g) | 3.96±0.14[6] cgs |
| Temperature | 9,268±315[6] K |
| Rotational velocity (v sin i) | 84[6] km/s |
| Age | 340[6] Myr |
| Other designations | |
| χ Boo,48 Boötis,BD+29°2640,FK5 3204,GC 20495,HD 135502,HIP 74596,HR 5676,SAO 83729[9] | |
| Database references | |
| SIMBAD | data |
Chi Boötis is a single,[10] white-huedstar in thenorthernconstellationBoötes, near the eastern constellation border withCorona Borealis. Its name is aBayer designation that isLatinised from χ Boötis, and abbreviated Cho Boo or χ Boo. This star is faintly visible to thenaked eye with anapparent visual magnitude of +5.3.[1] Based upon an annualparallax shift of13.4 mas as seen from the Earth, it is located approximately 244light-years (75 pc) from Earth. The star is moving closer to the Sun with aradial velocity of −16 km/s.[5]
This is anA-type main-sequence star with astellar classification of A2 V,[3] which indicates it is generating energy viahydrogen fusion at itscore. It is about 340[6] million years old with aprojected rotational velocity of 84[6] km/s. The star has double themass of the Sun,[6] 2.24 times theSun's radius,[7] and is emitting 37[8] times theSun's luminosity from itsphotosphere at aneffective temperature of around9,268 K.[6] It displays aninfrared excess at an emission temperature of 65 K, indicating there is acircumstellar disk of dust orbiting the star at a distance of around123 AU.[7]
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