Tau Sagittarii information

τ Sagittarii
	Location of τ Sagittarii (circled)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Sagittarius
Right ascension	19h 06m 56.40897s
Declination	–27° 40′ 13.5189″
Apparent magnitude (V)	+3.326
Characteristics
Spectral type	K1 III
U−B color index	+1.185
B−V color index	+1.170
Astrometry
Radial velocity (Rv)	+45.4 km/s
Proper motion (μ)	RA: –50.61 mas/yr ; Dec.: -249.80 mas/yr
Parallax (π)	28.3195 ± 0.3134 mas
Distance	115 ± 1 ly ; (35.3 ± 0.4 pc)
Absolute magnitude (MV)	0.48
Details
Mass	1.25 M☉
Radius	15.71 R☉
Luminosity	87.6 L☉
Surface gravity (log g)	2.15 cgs
Temperature	4,459 K
Metallicity [Fe/H]	–0.27 dex
Rotational velocity (v sin i)	1.04 km/s
Age	7.91 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
SIMBAD	data

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

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^ ^a ^b ^c Cite error: The named reference aaass22_9 was invoked but never defined (see the help page).
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^ 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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Observation data Epoch J2000.0 Equinox J2000.0
Location of τ Sagittarii (circled)
Constellation	Sagittarius
Right ascension	19^h 06^m 56.40897^s^[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 (R_v)	+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]
Distance	115 ± 1 ly (35.3 ± 0.4 pc)
Absolute magnitude (M_V)	0.48^[6]

Details^[7]

Mass	1.25 `M`_☉
Radius	15.71 `R`_☉
Luminosity	87.6 `L`_☉
Surface gravity (log g)	2.15 cgs
Temperature	4,459 K
Metallicity [Fe/H]	–0.27 dex
Rotational velocity (v sin i)	1.04^[8] km/s
Age	7.91 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
SIMBAD	data

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