Psi Virginis

ψ Virginis
Location of ψ Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 54m 21.16342s[1]
Declination −09° 32′ 20.3783″[1]
Apparent magnitude (V) 4.73 - 4.96[2]
Characteristics
Spectral type M3 IIICa-1[3]
U−B color index +1.57[4]
B−V color index +1.58[4]
Variable type LB[2]
Astrometry
Radial velocity (Rv)+12.82[5] km/s
Proper motion (μ) RA: −18.08[1] mas/yr
Dec.: −19.52[1] mas/yr
Parallax (π)5.99 ± 0.23 mas[1]
Distance540 ± 20 ly
(167 ± 6 pc)
Absolute magnitude (MV)−1.34[6]
Details
Mass3.95[7] M☉
Radius93[8] R☉
Luminosity3,548[7] L☉
Surface gravity (log g)1.05[9] cgs
Temperature3,500[7] K
Metallicity [Fe/H]−0.10[9] dex
Other designations
ψ Vir, 40 Virginis, BD−08°3449, FK5 1335, HD 112142, HIP 62985, HR 4902, SAO 139033[10]
Database references
SIMBADdata

Psi Virginis (ψ Vir, ψ Virginis) is a suspected[5] binary star[3] system in the zodiac constellation of Virgo. It can be seen with the naked eye and has an apparent visual magnitude of about 4.8. Based upon the annual parallax shift of 5.99 milliarcseconds, the distance to this star is roughly 540 light years. The angular size of Psi Virginis was measured on December 26, 1975 during an occultation by the Moon, yielding the estimate 6.5±0.3 mas.[11]

A visual band light curve for Psi Virginis, plotted from data published by Tabur et al. (2009)[12]

The primary component is an evolved red giant star with a stellar classification of M3 IIICa-1.[3] It is an irregular variable[13] with seven measured pulsation periods ranging from 22.4 to 162.6 days, and amplitudes ranging up to 0.m022.[12] The star is a bright X-ray source with a luminosity of 21.58×1029 ergs s−1.[14] There is a magnitude 8.3 companion at an angular separation of 0.04 arcseconds.[3]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Famaey2009 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 Cite error: The named reference charbonnel2020 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference wu2011 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Fekel1977 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference tabur2009 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mennessier2001 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Makarov2003 was invoked but never defined (see the help page).