33 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 38m 50.22449s |
| Declination | +44° 24′ 16.1979″ |
| Apparent magnitude (V) | 5.39 |
| Characteristics | |
| Spectral type | A1 V |
| B−V color index | 0.030±0.003 |
| Astrometry | |
| Radial velocity (Rv) | −13.0±4.2 km/s |
| Proper motion (μ) | RA: –67.247 mas/yr Dec.: −17.749 mas/yr |
| Parallax (π) | 17.3936±0.1330 mas |
| Distance | 188 ± 1 ly (57.5 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.61 |
| Details | |
| Mass | 2.25 M☉ |
| Luminosity | 20.94 L☉ |
| Surface gravity (log g) | 4.18 cgs |
| Temperature | 10,176±346 K |
| Rotational velocity (v sin i) | 86 km/s |
| Age | 142 Myr |
| Other designations | |
| 33 Boo, BD+45°2204, FK5 540, HD 129002, HIP 71618, HR 5468, SAO 45153 | |
| Database references | |
| SIMBAD | data |
33 Boötis is a single star in the northern constellation Boötes, located 188 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.39. The object is moving closer to the Earth with a heliocentric radial velocity of −13 km/s, and is catalogued as a member of the Pleiades supercluster.
This is an ordinary A-type main-sequence star with a stellar classification of A1 V. It is a source of X-ray emission, but early A-type stars are not expected to be an X-ray source so this may indicate it has an undetected companion. 33 Boötis is 142 million years old with a projected rotational velocity of 86 km/s. The star has 2.25 times the mass of the Sun and is radiating 21 times the luminosity of the Sun from its photosphere at an effective temperature of 10,176 K.