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Pi Sagittarii
  | |
| 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☉ |
| Radius | 28.4[7] R☉ |
| Luminosity | 1,285[7] L☉ |
| Surface gravity (log g) | 2.21 ± 0.05[2] cgs |
| Temperature | 6,590 ± 50[2] K |
| Rotational velocity (v sin i) | 30[8] km/s |
| Age | 67[2] Myr |
| Other designations | |
| 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,[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]
The three components are designated Pi Sagittarii A (officially named Albaldah /ælˈbɔːldə/, from the traditional name of the entire system),[10] B and C.[9]
- ^ a b c d e Cite error: The named reference
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aass34_1was invoked but never defined (see the help page). - ^ Cite error: The named reference
gcrv1953was invoked but never defined (see the help page). - ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
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SIMBADwas invoked but never defined (see the help page). - ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
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