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ET Virginis

ET Virginis

A light curve for ET Virginis, plotted from data published by Tabur et al. (2009)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 14h 10m 50.48706s[2]
Declination −16° 18′ 07.3105″[2]
Apparent magnitude (V) 4.910[3]
Characteristics
Spectral type M2 IIIa[4]
U−B color index +1.72[3]
Variable type SRB[5]
Astrometry
Radial velocity (Rv)+18.58±0.56[6] km/s
Proper motion (μ) RA: +3.277[2] mas/yr
Dec.: −10.804[2] mas/yr
Parallax (π)5.8655 ± 0.2552 mas[2]
Distance560 ± 20 ly
(170 ± 7 pc)
Absolute magnitude (MV)−0.81[7]
Details
Mass3.24[8] M☉
Radius83[9] R☉
Luminosity963[2] L☉
Temperature3,899[2] K
Metallicity [Fe/H]−0.21±0.06[10] dex
Rotational velocity (v sin i)2.3±0.9[11] km/s
Other designations
ET Vir, BD−15°3817, HD 123934, HIP 69269, HR 5301, SAO 158401[12]
Database references
SIMBADdata

ET Virginis is a single,[13] red-hued star in the equatorial constellation of Virgo. It can be viewed with the naked eye, having an apparent visual magnitude of 4.91.[3] Based upon an annual parallax shift of 5.9 mas,[2] it is located 560 light years away. It is moving further from the Earth with a heliocentric radial velocity of +18.6 km/s,[6] having come within 177 ly of the Sun around 6.3 million years ago.[7]

ET Vir Pulsation Cycles[1]
Period (Days) 22.6 23.8 36.4 37.6 39.8 48.8 259.1
Amplitude (mag.) 0.021 0.023 0.018 0.027 0.021 0.019 0.032

This is an evolved red giant star with a stellar classification of M2 IIIa.[4] It is a semiregular variable star of subtype SRB with a magnitude that ranges from a high of 4.80 down to 5.00.[5] The measured angular diameter of this star, after correcting for limb darkening, is 4.79±0.34 mas.[14] At its estimated distance, this yields a physical size of 83 times the radius of the Sun.

  1. ^ a b Cite error: The named reference Tabur2009 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Soubiran2010 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference kervella2022 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gaspar2016 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Zamanov2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggleton2008 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).

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