16 Virginis

16 Virginis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Virgo
Right ascension 12h 20m 20.98133s[1]
Declination +03° 18′ 45.2604″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Spectral type K0.5 IIIb Fe−0.5[3]
B−V color index 1.16[2]
Astrometry
Radial velocity (Rv)+36.66±0.17[4] km/s
Proper motion (μ) RA: −292.95[1] mas/yr
Dec.: −63.58[1] mas/yr
Parallax (π)10.59 ± 0.25 mas[1]
Distance308 ± 7 ly
(94 ± 2 pc)
Absolute magnitude (MV)0.26[5]
Details
Mass1.62[2] M☉
Radius18[6] R☉
Luminosity131.8[2] L☉
Surface gravity (log g)2.20[7] cgs
Temperature4,423±32[2] K
Metallicity [Fe/H]−0.33[7] dex
Age3.22[2] Gyr
Other designations
c Vir, 16 Vir, NSV 5558, BD+04°2604, HD 107328, HIP 60172, HR 4695, SAO 119341[8]
Database references
SIMBADdata

16 Virginis is a single[9] star in the zodiac constellation of Virgo, located about 308[1] light years from the Sun. It has the Bayer designation c Virginis; 16 Virginis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.96.[2] This is an IAU radial velocity standard star;[10] it is moving further from the Earth with a heliocentric radial velocity of +37 km/s.[4] The star has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.301″ per year.[11]

In Chinese astronomy, 16 Virginis is called 謁者, Pinyin: Yèzhě, meaning Usher to the Court, because this star is marking itself and stand alone in Usher to the Court asterism, Supreme Palace enclosure mansion (see : Chinese constellation).[12]

This is an evolved K-type giant star with a stellar classification of K0.5 IIIb Fe−0.5,[3] where the suffix notation denotes a mild underabundance of iron in the spectrum. It is a red clump giant, which indicates is on the horizontal branch generating energy via helium fusion at its core.[13] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is 1.74±0.02 mas,[14] which, at its estimated distance, equates to a physical radius of about 18 times the radius of the Sun.[6] It is about three[2] billion years old with 1.62[2] times the mass of the Sun and is radiating 132[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,423 K.[2]

  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 e f g h i j k Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference gaia_dr2 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Cardini2005 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Jofré2014 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Batten1971 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference ridparthvirgo was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).