Pi Sagittarii

π Sagittarii
Location of π Sagittarii (circled)
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]
Distance520 ± 20 ly
(160 ± 7 pc)
Absolute magnitude (MV)−3.08[6]
Details
Mass5.9 ± 0.3[2] M☉
Surface gravity (log g)2.21 ± 0.05[2] cgs
Temperature6,590 ± 50[2] K
Rotational velocity (v sin i)30[7] km/s
Age67[2] 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.[8]
Database references
SIMBADdata

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),[9] B and C.[8]

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference mnras402_2_1369 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcrv1953 was invoked but never defined (see the help page).
  5. ^ 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.
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference csrv was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.