CP Boötis
CP Boötis is a yellow-white hued star in the northern constellation of Boötes. With a baseline apparent visual magnitude of 6.40, 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 shift of 12.91 mas, which yields a range of 252.6 light years. It is moving further away with a heliocentric radial velocity of +5.9 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 33m 20.26330s |
| Declination | +36° 57′ 32.4483″ |
| Apparent magnitude (V) | 6.40 |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | F8 IVw |
| U−B color index | 0.07 |
| B−V color index | 0.51 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | +5.9 km/s |
| Proper motion (μ) | RA: +2.694 mas/yr Dec.: −73.096 mas/yr |
| Parallax (π) | 12.9135 ± 0.0244 mas |
| Distance | 252.6 ± 0.5 ly (77.4 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.05 |
| Details | |
| Mass | 1.77 M☉ |
| Luminosity | 12.0+1.5 −1.3 L☉ |
| Surface gravity (log g) | 3.67 cgs |
| Temperature | 6,276 K |
| Metallicity [Fe/H] | 0.25 dex |
| Rotational velocity (v sin i) | 5.7 km/s |
| Age | 1.70 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an F-type subgiant star with a stellar classification of F8 IVw, 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 that varies by 0.02 magnitude. At the age of 1.7 billion years it is spinning with a projected rotational velocity of 5.7 km/s. The star has 1.77 times the mass of the Sun and is radiating 12 times the Sun's luminosity from its photosphere at an effective temperature of 6,276 K.