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Nu Virginis

ν Virginis
Location of ν Virginis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension 11h 45m 51.5596s[1]
Declination +06° 31′ 45.749″[1]
Apparent magnitude (V) 4.04[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M1 III[4]
U−B color index +1.80[2]
B−V color index +1.52[2]
Astrometry
Radial velocity (Rv)50.19±0.30[5] km/s
Proper motion (μ) RA: −21.1 mas/yr[1]
Dec.: −182.9 mas/yr[1]
Parallax (π)9.8446 ± 0.2744 mas[1]
Distance331 ± 9 ly
(102 ± 3 pc)
Absolute magnitude (MV)−0.87[6]
Details[7]
Mass0.92±0.00 M☉
Radius54.8±0.9 R☉
Luminosity523±31 L☉
Surface gravity (log g)1.0[5] cgs
Temperature3,728±47 K
Metallicity [Fe/H]−0.41 dex
Rotational velocity (v sin i)3.8[5] km/s
Age11.69±0.13 Gyr
Other designations
ν Vir, 3 Virginis, BD+07°2479, FK5 1302, HD 102212, HIP 57380, HR 4517, SAO 119035[8]
Database references
SIMBADdata

ν Virginis, Latinized as Nu Virginis, is a single[9] star in the zodiac constellation of Virgo, located at the western tip of the classic constellation and nearly due south of the prominent star Denebola.[10] It is a red-hued star with an apparent visual magnitude of 4.04[2] and can be seen with the naked eye. Because the star lies near the ecliptic it is subject to occultations by the Moon.[11] Parallax measurements provide an estimated distance of around 331 light years from the Sun,[1] and it is drifting further away with a radial velocity of +50 km/s.[5]

A light curve for Nu Virginis, plotted from Hipparcos data[12]

This object is an M-type red giant, currently on the asymptotic giant branch,[3] with a stellar classification of M1 III.[4] It is an SRB-type[13] semiregular variable star with its brightness varying by 0.0125 in magnitude.[14] These variations have four periods lasting 11.1, 12.3, 16.8, and 23.7 days.[15] This star has 90% the mass of the sun, but it has expanded to 54 times the Sun's radius and shines 520 times as brightly as the Sun. The effective temperature of its outer atmosphere is 3,728 K.[7]

  1. ^ a b c d e Cite error: The named reference DR3 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 Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference araa11_29 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Pace2003 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference baines 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 Kaler was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference White1987 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference kazarovets1999 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Koen2002 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Tabur2009 was invoked but never defined (see the help page).

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