| 释义 |
- References
{{Starbox begin
| name=τ Leonis
}}{{Starbox observe
| constell = Leo
| epoch = J2000.0 (ICRS)
| ra = {{RA|11|27|56.23976}}
| dec = {{DEC|+02|51|22.5609}}
| appmag_v = 5.00[3]
}}{{Starbox character
| class = G8- IIIa[4]
| b-v = +1.005[3]
| u-b = +0.80[3]
| variable =
}}{{Starbox astrometry
| radial_v = −8.90[7]
| prop_mo_ra = +16.89
| prop_mo_dec = −9.81
| parallax = 5.80
| p_error = 0.33
| parallax_footnote =
| absmag_v = {{Val|−1.12|0.124}}[11]
}}{{Starbox detail
| mass = {{Val|3.90|0.19}}[12]
| radius = {{Val|25.14|1.55}}[12]
| luminosity = {{Val|329.6|39.6}}[12]
| temperature = {{Val|4910|33|fmt=commas}}[12]
| metal_fe = {{Val|−0.07|0.10}}[12]
| gravity = {{Val|2.25|0.05}}[12]
| rotational_velocity =
| age_myr = {{Val|190|20}}[12]
}}{{Starbox catalog
| names = τ Leo, 84 Leo, BD+03° 2504, FK5 1297, HD 99648, HIP 55945, HR 4418, SAO 118875.[19]
}}{{Starbox reference
|Simbad=tau+Leo
}}{{Starbox end}}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.[20] It has an apparent visual magnitude of 5.00,[3] which is bright enough to be seen with the naked eye. The distance to this star, as estimated using parallax measurements,[ is 560 light years. It is moving closer to the Sun with a radial velocity of −9 km/s.[7]]This G-type giant star has a stellar classification of G8- IIIa[4] 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.[12] References1. ^1 {{citation | postscript=. | title=Further Lunar Occultations from the 2.4 m Thai National Telescope | last1=Richichi | first1=A. | last2=Tasuya | first2=O. | last3=Irawati | first3=P. | last4=Yadav | first4=R. K. | journal=The Astronomical Journal | display-authors=1 | volume=154 | issue=6 | id=215 | pages=4 | date=December 2017 | doi=10.3847/1538-3881/aa9068 | bibcode=2017AJ....154..215R }}
2. ^1 {{citation | display-authors=1 | last1=Park | first1=Sunkyung | last2=Kang | first2=Wonseok | last3=Lee | first3=Jeong-Eun | last4=Lee | first4=Sang-Gak | title=Wilson-Bappu Effect: Extended to Surface Gravity | journal=The Astronomical Journal | volume=146 | issue=4 | pages=73 | year=2013 | doi=10.1088/0004-6256/146/4/73 | bibcode=2013AJ....146...73P | arxiv=1307.0592 | postscript=. }}
3. ^1 2 3 4 5 6 7 8 {{citation | last1=Hekker | first1=S. | last2=Meléndez | first2=J. | title=Precise radial velocities of giant stars. III. Spectroscopic stellar parameters | journal=Astronomy and Astrophysics | volume=475 | issue=3 | pages=1003–1009 | year=2007 | bibcode=2007A&A...475.1003H | doi=10.1051/0004-6361:20078233 | arxiv=0709.1145 | postscript=. }}
4. ^1 2 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
5. ^1 2 {{citation | first1=P. | last1=Keenan | first2=R. | last2=McNeil | title=The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | volume=71 | pages=245–266 | date=October 1989 | bibcode=1989ApJS...71..245K | doi=10.1086/191373 | postscript=. }}
6. ^1 2 3 4 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | publisher=SIMBAD | date=1986 | bibcode=1986EgUBV........0M | postscript=. }}
7. ^1 {{cite simbad | title=* tau Leo | accessdate=2016-09-29 | postscript=. }}
[1][2][3][4][5][6][7]
}}{{Stars of Leo|state=collapsed}} 8 : G-type giants|Bayer objects|Leo (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |