Pi Sagittarii
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 09m 45.83293s |
| Declination | −21° 01′ 25.0103″ |
| Apparent magnitude (V) | +2.89 |
| Characteristics | |
| Spectral type | F2 II |
| U−B color index | +0.22 |
| B−V color index | +0.35 |
| Astrometry | |
| Radial velocity (Rv) | −9.8 km/s |
| Proper motion (μ) | RA: −1.36 mas/yr Dec.: −36.45 mas/yr |
| Parallax (π) | 6.2410±0.2868 mas |
| Distance | 520 ± 20 ly (160 ± 7 pc) |
| Absolute magnitude (MV) | −3.08 |
| Details | |
| Mass | 5.9±0.3 M☉ |
| Radius | 28.4 R☉ |
| Luminosity | 1,285 L☉ |
| Surface gravity (log g) | 2.21±0.05 cgs |
| Temperature | 6,590±50 K |
| Rotational velocity (v sin i) | 30 km/s |
| Age | 67 Myr |
| Other designations | |
| Albaldah, π Sgr, 41 Sgr, BD−21°5275, CCDM J19098-2101AB, FK5 720, GC 26386, HD 178524, HIP 94141, HR 7264, SAO 187756, WDS J19098-2101AB | |
| Database references | |
| SIMBAD | data |
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, 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.
The three components are designated Pi Sagittarii A (officially named Albaldah /ælˈbɔːldə/, from the traditional name of the entire system), B and C.