| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h38m 50.22449s[1] |
| Declination | +44° 24′ 16.1979″[1] |
| Apparent magnitude (V) | 5.39[2] |
| Characteristics | |
| Spectral type | A1 V[3] |
| B−V color index | 0.030±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.0±4.2[2] km/s |
| Proper motion (μ) | RA: –67.247[1] mas/yr Dec.: −17.749[1] mas/yr |
| Parallax (π) | 17.3936 ± 0.1330 mas[1] |
| Distance | 188 ± 1 ly (57.5 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.61[2] |
| Details | |
| Mass | 2.25[4] M☉ |
| Luminosity | 20.94[2] L☉ |
| Surface gravity (log g) | 4.18[5] cgs |
| Temperature | 10,176±346[4] K |
| Rotational velocity (v sin i) | 86[4] km/s |
| Age | 142[4] Myr |
| Other designations | |
33 Boo, BD+45°2204, FK5 540, HD 129002, HIP 71618, HR 5468, SAO 45153[6] | |
| Database references | |
| SIMBAD | data |
33 Boötis is a single[7] 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.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −13 km/s,[2] and is catalogued as a member of the Pleiades supercluster.[8]
This is an ordinary A-type main-sequence star with a stellar classification of A1 V.[3] 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.[9] 33 Boötis is 142[4] million years old with a projected rotational velocity of 86 km/s.[4] The star has 2.25[4] times the mass of the Sun and is radiating 21[2] times the luminosity of the Sun from its photosphere at an effective temperature of 10,176 K.[4]
