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Pi Sagittarii
Triple star system in the constellation Sagittarius / From Wikipedia, the free encyclopedia
Pi Sagittarii (π Sagittarii, abbreviated Pi Sgr, π Sgr) is a triple star system in the zodiac constellation of Sagittarius. It has an apparent visual magnitude of +2.89,[2] bright enough to be readily seen with the naked eye. Based upon parallax measurements, it is roughly 510 light-years (160 parsecs) from the Sun.[1]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sagittarius |
Right ascension | 19h 09m 45.83293s[1] |
Declination | –21° 01′ 25.0103″[1] |
Apparent magnitude (V) | +2.89[2] |
Characteristics | |
Spectral type | F2 II[2] |
U−B color index | +0.22[3] |
B−V color index | +0.35[3] |
Astrometry | |
Radial velocity (Rv) | –9.8[4] km/s |
Proper motion (μ) | RA: –1.36[1] mas/yr Dec.: –36.45[1] mas/yr |
Parallax (π) | 6.2410 ± 0.2868 mas[5] |
Distance | 520 ± 20 ly (160 ± 7 pc) |
Absolute magnitude (MV) | −3.08[6] |
Details | |
Mass | 5.9 ± 0.3[2] M☉ |
Surface gravity (log g) | 2.21 ± 0.05[2] cgs |
Temperature | 6,590 ± 50[2] K |
Rotational velocity (v sin i) | 30[7] km/s |
Age | 67[2] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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The three components are designated Pi Sagittarii A (officially named Albaldah /ælˈbɔːldə/, from the traditional name of the entire system),[9] B and C.[8]