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Sigma Virginis

σ Virginis
Location of σ Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 13h 17m 36.28327s[1]
Declination +05° 28′ 11.5221″[1]
Apparent magnitude (V) 4.86[2]
Characteristics
Spectral type M1 III[3]
U−B color index +1.86[2]
B−V color index +1.62[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−28.26±0.30[5] km/s
Proper motion (μ) RA: −6.06[1] mas/yr
Dec.: +9.14[1] mas/yr
Parallax (π)4.83 ± 0.19 mas[1]
Distance680 ± 30 ly
(207 ± 8 pc)
Absolute magnitude (MV)−1.80[6]
Details
Radius98[7] R☉
Luminosity1,610[7] L☉
Surface gravity (log g)0.42[7] cgs
Temperature3,690[7] K
Other designations
σ Vir, 60 Virginis, BD+06°2722, FK5 1344, HD 115521, HIP 64852, HR 5015, SAO 119855[8]
Database references
SIMBADdata

Sigma Virginis (σ Vir, σ Virginis) is a star in the zodiac constellation of Virgo. It can be faintly seen with the naked eye with a baseline apparent visual magnitude of 4.86.[2] Based upon parallax measurements, the distance to this star is roughly 680 light-years.

A light curve for Sigma Virginis, plotted from Hipparcos data[9]

This is an evolved red giant star with a stellar classification of M1 III.[3] It is a suspected variable star with a brightness that ranges from magnitude +4.77 to +4.86.[4] This variation has pulsation periods of 23.4, 24.3, 27.9 and 34.1 days.[3] The effective temperature of the stellar atmosphere is around 3,800 K, and it shines with 1,734 times the luminosity of the Sun.[7]

  1. ^ a b c d e 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 Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference tabur2009 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Kukarkin1981 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference McDonald2017 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 CDS was invoked but never defined (see the help page).

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