Theta Virginis

θ Virginis
	Location of θ Virginis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Virgo
Right ascension	13h 09m 56.99067s
Declination	−05° 32′ 20.4185″
Apparent magnitude (V)	4.37 (4.49 + 6.83 + 9.4 + 10.4)‍
Characteristics
Spectral type	A1Vs + ? + A9m + ?
U−B color index	+0.00
B−V color index	−0.02
Astrometry
Radial velocity (Rv)	−2.9 km/s
Proper motion (μ)	RA: −36.28 mas/yr ; Dec.: −31.22 mas/yr
Parallax (π)	10.33±1.09 mas
Distance	approx. 320 ly ; (approx. 100 pc)
Absolute magnitude (MV)	−0.52
Details
θ Vir Aa
Mass	3.11±0.11 M☉
Radius	4.03±0.30 R☉
Luminosity	130+22; −19 L☉
Surface gravity (log g)	3.61±0.11 cgs
Temperature	9,600±140 K
Metallicity [Fe/H]	0.15±0.14 dex
Rotational velocity (v sin i)	4±1 km/s
Other designations
	51 Virginis, θ Vir, BD−04°3430, FK5 490, HD 114330, HIP 64238, HR 4963, SAO 139189.
Database references
SIMBAD	data

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]^: 167

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
^ ^a ^b ^c ^d Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ ^a ^b ^c Landstreet, J. D.; et al. (September 2009), "Atmospheric velocity fields in tepid main sequence stars", Astronomy and Astrophysics, 503 (3): 973–984, arXiv:0906.3824, Bibcode:2009A&A...503..973L, doi:10.1051/0004-6361/200912083, S2CID 53423301.
^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ ^a ^b ^c ^d ^e Romanovskaya, A M; Ryabchikova, T A; Pakhomov, Yu V; Korotin, S A; Sitnova, T M (2023-12-11), "Non-LTE abundance analysis of A-B stars with low rotational velocities – II. Do A-B stars with normal abundances exist?", Monthly Notices of the Royal Astronomical Society, 526 (3): 3386–3399, arXiv:2309.08384, doi:10.1093/mnras/stad2862, ISSN 0035-8711.
^ "tet Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-05.{{cite web}}: CS1 maint: postscript (link)
^ ^a ^b Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. S2CID 119047709.
^ Adelman, Saul J. (November 1997), "On the possible variability of the main sequence A stars theta Virginis and 109 Virginis", Astronomy & Astrophysics Supplement Series, 125 (3): 497–499, Bibcode:1997A&AS..125..497A, doi:10.1051/aas:1997105.
^ Scholz, G.; et al. (September 1998), "Spectroscopic and photometric investigations of MAIA candidate stars", Astronomy and Astrophysics, 337: 447–459, Bibcode:1998A&A...337..447S.
^ Meeus, Jan (2002). "Mutual occultations of planets". More Mathematical Astronomy Morsels (PDF). pp. 163–167. ISBN 0943396743. Archived from the original (PDF) on 2025-04-05.

External links

Kaler, James B., "Theta Virginis", Stars, University of Illinois, retrieved 2016-09-08.
Plotner, Tammy; Vogt, Ken (2009), The Night Sky Companion: A Yearly Guide to Sky-Watching 2009, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 172, ISBN 978-0387795096.

[van_Leeuwen2007-1] van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

[Mermilliod1986-2] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.

[mnras389_2_869-3] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[Landstreet2009-4] Landstreet, J. D.; et al. (September 2009), "Atmospheric velocity fields in tepid main sequence stars", Astronomy and Astrophysics, 503 (3): 973–984, arXiv:0906.3824, Bibcode:2009A&A...503..973L, doi:10.1051/0004-6361/200912083, S2CID 53423301.

[gcrv1953-5] Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.

[Anderson2012-6] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.

[aaa537_A120-7] Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.

[Romanovskaya2023-8] Romanovskaya, A M; Ryabchikova, T A; Pakhomov, Yu V; Korotin, S A; Sitnova, T M (2023-12-11), "Non-LTE abundance analysis of A-B stars with low rotational velocities – II. Do A-B stars with normal abundances exist?", Monthly Notices of the Royal Astronomical Society, 526 (3): 3386–3399, arXiv:2309.08384, doi:10.1093/mnras/stad2862, ISSN 0035-8711.

[SIMBAD-9] "tet Vir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-05.{{cite web}}: CS1 maint: postscript (link)

[MSC-10] Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. S2CID 119047709.

[Adelman1997-11] Adelman, Saul J. (November 1997), "On the possible variability of the main sequence A stars theta Virginis and 109 Virginis", Astronomy & Astrophysics Supplement Series, 125 (3): 497–499, Bibcode:1997A&AS..125..497A, doi:10.1051/aas:1997105.

[Scholz1998-12] Scholz, G.; et al. (September 1998), "Spectroscopic and photometric investigations of MAIA candidate stars", Astronomy and Astrophysics, 337: 447–459, Bibcode:1998A&A...337..447S.

[Mus2002-13] Meeus, Jan (2002). "Mutual occultations of planets". More Mathematical Astronomy Morsels (PDF). pp. 163–167. ISBN 0943396743. Archived from the original (PDF) on 2025-04-05.

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Theta Virginis

References

External links

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