Tau Leonis information

τ Leonis
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Leo
Right ascension	11h 27m 56.23976s
Declination	+02° 51′ 22.5609″
Apparent magnitude (V)	5.00
Characteristics
Spectral type	G8- IIIa
U−B color index	+0.80
B−V color index	+1.005
Astrometry
Radial velocity (Rv)	−8.90 km/s
Proper motion (μ)	RA: +16.89 mas/yr ; Dec.: −9.81 mas/yr
Parallax (π)	5.80 ± 0.33 mas
Distance	560 ± 30 ly ; (172 ± 10 pc)
Absolute magnitude (MV)	−1.12±0.124
Details
Mass	3.90±0.19 M☉
Radius	25.14±1.55 R☉
Luminosity	329.6±39.6 L☉
Surface gravity (log g)	2.25±0.05 cgs
Temperature	4,910±33 K
Metallicity [Fe/H]	−0.07±0.10 dex
Age	190±20 Myr
Other designations
	τ Leo, 84 Leo, BD+03°2504, FK5 1297, HD 99648, HIP 55945, HR 4418, SAO 118875
Database references
SIMBAD	data

Tau Leonis (τ Leo) is a star in the zodiac constellation of Leo. Because it is located near the ecliptic, it is subject to occultations by the Moon.^[8] It has an apparent visual magnitude of 5.00,^[2] which is bright enough to be seen with the naked eye. The distance to this star, as estimated using parallax measurements,^[1] is 560 light years. It is moving closer to the Sun with a radial velocity of −9 km/s.^[4]

This G-type giant star has a stellar classification of G8- IIIa^[3] and currently resides on the red giant branch. It has about 390% of the Sun's mass. The star is much younger than the Sun, with an age of around 190 million years. As an evolved giant, it has expanded to about 25 times the Sun's radius and radiates 330 times the luminosity of the Sun. The effective temperature of the outer atmosphere is 4,910 K.^[6]

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^ ^a ^b ^c ^d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aa546_A61 was invoked but never defined (see the help page).
^ Cite error: The named reference park2013 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference Hekker2007 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Cite error: The named reference Richichi2017 was invoked but never defined (see the help page).

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[Mermilliod1986-2] Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).

[Keenan1989-3] Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).

[aa546_A61-4] Cite error: The named reference aa546_A61 was invoked but never defined (see the help page).

[park2013-5] Cite error: The named reference park2013 was invoked but never defined (see the help page).

[Hekker2007-6] ^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference Hekker2007 was invoked but never defined (see the help page).

[SIMBAD-7] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Richichi2017-8] Cite error: The named reference Richichi2017 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Leo
Right ascension	11^h 27^m 56.23976^s^[1]
Declination	+02° 51′ 22.5609″^[1]
Apparent magnitude (V)	5.00^[2]
Characteristics
Spectral type	G8- IIIa^[3]
U−B color index	+0.80^[2]
B−V color index	+1.005^[2]
Astrometry

Radial velocity (R_v)	−8.90^[4] km/s
Proper motion (μ)	RA: +16.89^[1] mas/yr Dec.: −9.81^[1] mas/yr
Parallax (π)	5.80 ± 0.33 mas^[1]
Distance	560 ± 30 ly (172 ± 10 pc)
Absolute magnitude (M_V)	−1.12±0.124^[5]

Details

Mass	3.90±0.19^[6] `M`_☉
Radius	25.14±1.55^[6] `R`_☉
Luminosity	329.6±39.6^[6] `L`_☉
Surface gravity (log g)	2.25±0.05^[6] cgs
Temperature	4,910±33^[6] K
Metallicity [Fe/H]	−0.07±0.10^[6] dex
Age	190±20^[6] Myr

Other designations
τ Leo, 84 Leo, BD+03°2504, FK5 1297, HD 99648, HIP 55945, HR 4418, SAO 118875^[7]
Database references
SIMBAD	data

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