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 2 3 4 5 6 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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