| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h33m 20.26330s[1] |
| Declination | +36° 57′ 32.4483″[1] |
| Apparent magnitude (V) | 6.40[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | F8 IVw[4] |
| U−B color index | 0.07[2] |
| B−V color index | 0.51[2] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | +5.9[6] km/s |
| Proper motion (μ) | RA: +2.694[1] mas/yr Dec.: −73.096[1] mas/yr |
| Parallax (π) | 12.9135 ± 0.0244 mas[1] |
| Distance | 252.6 ± 0.5 ly (77.4 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.05[2] |
| Details | |
| Mass | 1.77[6] M☉ |
| Luminosity | 12.0+1.5 −1.3[7] L☉ |
| Surface gravity (log g) | 3.67[6] cgs |
| Temperature | 6,276[6] K |
| Metallicity [Fe/H] | 0.25[6] dex |
| Rotational velocity (v sin i) | 5.7[3] km/s |
| Age | 1.70[6] Gyr |
| Other designations | |
CP Boo, BD+37° 2545, HD 127986, HIP 71168, HR 5441, SAO 64212[8] | |
| Database references | |
| SIMBAD | data |
CP Boötis is a yellow-white hued star in the northern constellationofBoötes. With a baseline apparent visual magnitude of 6.40,[2] it is at or near the lower limit for visibility with the typical naked eye in good viewing conditions. The distance to this star can be estimated from its annual parallax shiftof12.91 mas,[1] which yields a range of 252.6 light years. It is moving further away with a heliocentric radial velocity of +5.9 km/s.[6]
This is an F-type subgiant star with a stellar classification of F8 IVw,[4] which indicates it has nearly consumed the hydrogen at its core and is now evolving into a giant star. It is a low amplitude Delta Scuti variable[9] that varies by 0.02 magnitude.[10] At the age of 1.7[6] billion years it is spinning with a projected rotational velocity of 5.7 km/s.[3] The star has 1.77[6] times the mass of the Sun and is radiating 12[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,276 K.[6]
