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{{Starbox begin
| name = 109 Tauri
}}{{Starbox observe
| epoch = J2000
| constell = Taurus
| ra = {{RA|05|19|16.60169}}[1]
| dec = {{DEC|+22|05|47.3740}}[1]
| appmag_v = 4.96[3]
}}{{Starbox character
| class = G8 III[4]
| b-v = {{Val|0.937|0.001}}[3]
| u-b =
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|+19.03|0.01}}[6]
| prop_mo_ra = +18.91[1]
| prop_mo_dec = −81.57[1]
| parallax = 13.19
| p_error = 0.30
| parallax_footnote = [1]
| absmag_v = 0.56[3]
}}{{Starbox detail
| source = [6]
| mass = {{Val|2.47|0.08}}
| radius = {{Val|8.14|0.46}}
| luminosity = {{Val|60|10|12}}
| gravity = {{Val|2.96|0.01}}
| temperature = {{Val|5035|23|fmt=commas}}
| metal_fe = {{Val|0.10|0.04}}
| rotational_velocity = {{Val|1.15|0.62}}
| age_myr = {{Val|600|50}}
}}{{Starbox catalog
| names = {{odlist | B=n Tau | F=109 Tau | BD=+21° 816 | FK5=2398 | HD=34559 | HIP=24822 | HR=1739 | SAO=77097 }}
}}{{Starbox reference
| Simbad = 109+Tau
}}{{Starbox end}}109 Tauri, or n Tauri, is a single,[13] yellow-hued star in the zodiac constellation of Taurus. It has an apparent visual magnitude of 4.96[3] and is faintly visible to the naked eye. The star has an annual parallax shift of {{Val|13.19|0.30|ul=mas}},[1] putting it around 247 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.24 due to interstellar dust.[6] It is moving further from the Sun with a heliocentric radial velocity of +19 km/s.[6]This is an evolved giant star with a stellar classification of G8 III,[4] having consumed the hydrogen at its core and moved off the main sequence. At the age of 600[6] million years, it has become a red clump giant, indicating that it is on the horizontal branch and is generating energy through helium fusion at its core.[20] The star has an estimated 2.47 times the mass of the Sun and has expanded to around eight times the Sun's radius. It is radiating about 60 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,035 K.[6] References1. ^1 2 3 4 5 6 {{citation | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | postscript=. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}
2. ^1 {{citation | display-authors=1 | last1=Puzeras | first1=E. | last2=Tautvaišienė | first2=G. | last3=Cohen | first3=J. G. | last4=Gray | first4=D. F. | last5=Adelman | first5=S. J. | last6=Ilyin | first6=I. | last7=Chorniy | first7=Y. | title=High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements | journal=Monthly Notices of the Royal Astronomical Society | volume=408 | issue=2 | pages=1225–1232 | date=October 2010 | doi=10.1111/j.1365-2966.2010.17195.x | bibcode=2010MNRAS.408.1225P | postscript=. | arxiv=1006.3857 }}
3. ^1 2 {{citation | title=The Spectra of the Bright Stars of Types F5-K5 | last=Roman | first=Nancy G. | postscript=. | journal=Astrophysical Journal | volume=116 | page=122 | date=July 1952 | doi=10.1086/145598 | bibcode=1952ApJ...116..122R }}
4. ^1 2 3 4 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
5. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | postscript=. | arxiv=0806.2878 }}
6. ^1 2 3 4 5 6 {{citation | postscript=. | title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets | last1=Jofré | first1=E. | last2=Petrucci | first2=R. | last3=Saffe | first3=C. | last4=Saker | first4=L. | last5=de la Villarmois | first5=E. Artur | last6=Chavero | first6=C. | last7=Gómez | first7=M. | last8=Mauas | first8=P. J. D. | journal=Astronomy & Astrophysics | display-authors=1 | volume=574 | id=A50 | pages=46 | date=February 2015 | doi=10.1051/0004-6361/201424474 | bibcode=2015A&A...574A..50J | arxiv=1410.6422}}
}}{{Stars of Taurus}} 9 : G-type giants|Horizontal-branch stars|Taurus (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |