109 Tauri

109 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05h 19m 16.60169s[1]
Declination +22° 05′ 47.3740″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Spectral type G8 III[3]
B−V color index 0.937±0.001[2]
Astrometry
Radial velocity (Rv)+19.03±0.01[4] km/s
Proper motion (μ) RA: +18.91[1] mas/yr
Dec.: −81.57[1] mas/yr
Parallax (π)13.19 ± 0.30 mas[1]
Distance247 ± 6 ly
(76 ± 2 pc)
Absolute magnitude (MV)0.56[2]
Details[4]
Mass2.47±0.08 M☉
Radius8.14±0.46 R☉
Luminosity60+10
−12 L☉
Surface gravity (log g)2.96±0.01 cgs
Temperature5,035±23 K
Metallicity [Fe/H]0.10±0.04 dex
Rotational velocity (v sin i)1.15±0.62 km/s
Age600±50 Myr
Other designations
n Tau, 109 Tau, BD+21° 816, FK5 2398, HD 34559, HIP 24822, HR 1739, SAO 77097[5]
Database references
SIMBADdata

109 Tauri, or n Tauri, is a single,[6] yellow-hued star in the zodiac constellation of Taurus. It has an apparent visual magnitude of 4.96[2] and is faintly visible to the naked eye. The star has an annual parallax shift of 13.19±0.30 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.[4] It is moving further from the Sun with a heliocentric radial velocity of +19 km/s.[4]

This is an evolved giant star with a stellar classification of G8 III,[3] having consumed the hydrogen at its core and moved off the main sequence. At the age of 600[4] 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.[7] 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.[4]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Roman1952 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Jofre2015 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Puzeras2010 was invoked but never defined (see the help page).