Tau Sagittarii

τ Sagittarii
Location of τ Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 06m 56.40897s[1]
Declination –27° 40′ 13.5189″[1]
Apparent magnitude (V) +3.326[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.185[2]
B−V color index +1.170[2]
Astrometry
Radial velocity (Rv)+45.4[4] km/s
Proper motion (μ) RA: –50.61[1] mas/yr
Dec.: -249.80[1] mas/yr
Parallax (π)28.3195 ± 0.3134 mas[5]
Distance115 ± 1 ly
(35.3 ± 0.4 pc)
Absolute magnitude (MV)0.48[6]
Details[7]
Mass1.25 M☉
Radius15.71 R☉
Luminosity87.6 L☉
Surface gravity (log g)2.15 cgs
Temperature4,459 K
Metallicity [Fe/H]–0.27 dex
Rotational velocity (v sin i)1.04[8] km/s
Age7.91 Gyr
Other designations
Namalsadirah 2, Rabi al Sadira, τ Sagittarii, τ Sgr, Tau Sgr, 40 Sagittarii, CPD−27°6617, FK5 1496, GC 26291, HD 177716, HIP 93864, HR 7234, PPM 269078, SAO 187683
Database references
SIMBADdata

Tau Sagittarii (Tau Sgr, τ Sagittarii, τ Sgr) is a star in the southern zodiac constellation of Sagittarius.

  1. ^ a b c d Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference aaass22_9 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcsrv 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 Cardini2005 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference reffert was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference hekker was invoked but never defined (see the help page).