Pi Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 40m 43.5668s |
| Declination | +16° 25′ 05.967″ |
| Apparent magnitude (V) | 4.91 |
| Characteristics | |
| Spectral type | B9pMnHgSi |
| U−B color index | -0.31 |
| B−V color index | -0.03 |
| R−I color index | -0.02 |
| Astrometry | |
| Radial velocity (Rv) | -0.6 km/s |
| Proper motion (μ) | RA: 9.64 mas/yr Dec.: 9.46 mas/yr |
| Parallax (π) | 10.28 ± 0.91 mas |
| Distance | 320 ± 30 ly (97 ± 9 pc) |
| Absolute magnitude (MV) | –0.39[1] |
| Details | |
| Mass | 3.49 ± 0.14[1] M☉ |
| Radius | 3.2 ± 0.4[1] R☉ |
| Luminosity | 214[1] L☉ |
| Surface gravity (log g) | 3.98 ± 0.09[1] cgs |
| Temperature | 12,417[1] K |
| Other designations | |
| π1 Boötis: HD 129174, HR 5475, SAO 101138 | |
| π2 Boötis: HD 129175, HR 5476, SAO 101139 | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
| Database references | |
| SIMBAD | data |
Pi Boötis (π Boötis, π Boo) is a double star in the constellation Boötes. It is approximately 317 light years from Earth.
The brighter component (π1 Boötis) is a blue-white B-type main sequence dwarf with an apparent magnitude of +4.49. Its companion (π2 Boötis) is a white A-type main sequence dwarf with an apparent magnitude of +5.88. The stars are separated by 5.6 arcseconds on the sky.
Pi Boötis has the Chinese traditional star name 左攝提二 (Zuǒ shè tí èr)
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N
External links
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