Theta Virginis

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Template:Short description

θ Virginis
Template:Location mark
Location of θ Virginis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.37[2] (4.49 + 6.83 + 9.4 + 10.4)‍[3]
Characteristics
Spectral type A1Vs[4] + ? + A9m + ?[3]
U−B Template:Engvar +0.00[2]
B−V Template:Engvar −0.02[2]
Astrometry
Radial velocity (Rv)−2.9[5] km/s
Proper motion (μ) RA: −36.28[1] mas/yr
Dec.: −31.22[1] mas/yr
Parallax (π)10.33±1.09 mas[1]
Distanceapprox. Template:Rnd ly
(approx. Template:Rnd pc)
Absolute magnitude (MV)−0.52[6]
Details
θ Vir Aa
MassTemplate:Val[7] Template:Solar mass
RadiusTemplate:Val[8] Template:Solar radius
LuminosityTemplate:Val[8] Template:Solar luminosity
Surface gravity (log g)Template:Val[8] cgs
TemperatureTemplate:Val[8] K
Metallicity [Fe/H]Template:Val[8] dex
Rotational velocity (v sin i)Template:Val[4] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
51 Virginis, θ Vir, BD−04°3430, FK5 490, HD 114330, HIP 64238, HR 4963, SAO 139189.[9]
Database references
SIMBADdata

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Theta Virginis (θ Vir, θ Virginis) is a multiple star system in the zodiac constellation of Virgo. Based upon parallax measurements, it is about 320 light years from the Sun. The three[10] stars in this system have a combined apparent visual magnitude of 4.37,[2] bright enough to be seen with the naked eye.

The primary component, Theta Virginis Aa, is a white-hued A-type main sequence star with a stellar classification of A1Vs.[4] It is part of a spectroscopic binary[11] which components, Aa and Ab, have visual magnitudes of +4.49 and +6.83 respectively. The system has an orbital period of about 33.04 years with an eccentricity of 0.9.[3] The brighter member of this pair shows photometric and radial velocity periodicities with a cycle time of 0.7 days, which may indicate its rotation period.[12]

The inner pair is orbited by the 9.4 magnitude B component, at an angular separation of 7.1 arcseconds. A fourth component C, 69.6 arcseconds away, has an apparent magnitude of 10.4.[3] However, component C is an optical companion: it is physically unrelated and only appears close in the sky.[10]

On 11 November 2028 and again 11 November 2036, it will have close conjunctions with Venus.[13]Template:Rp

Coincidentally on 11 November 2044 Venus will occult it just 41 days after occulting the bright star Regulus.[14]

References

Template:Reflist

External links

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Template:Virgo

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named van Leeuwen2007
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Mermilliod1986
  3. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named mnras389_2_869
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Landstreet2009
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcrv1953
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa537_A120
  8. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Romanovskaya2023
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Adelman1997
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Scholz1998
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
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