Theta 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] |
| Distance | approx. Template:Rnd ly (approx. Template:Rnd pc) |
| Absolute magnitude (MV) | −0.52[6] |
| Details | |
| θ Vir Aa | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[8] Template:Solar radius |
| Luminosity | Script error: No such module "val".[8] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | Script error: No such module "val".[8] dex |
| Rotational velocity (v sin i) | Script error: No such module "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 | |
| SIMBAD | data |
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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
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- ↑ Template:Cite simbad
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External links
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