Psi Virginis
Template:Location mark Location of ψ Virginis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.73 - 4.96[2] |
| Characteristics | |
| Spectral type | M3 IIICa-1[3] |
| U−B Template:Engvar | +1.57[4] |
| B−V Template:Engvar | +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] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.34[6] |
| Details | |
| Mass | 3.95[7] Template:Solar mass |
| Radius | 93[8] Template:Solar radius |
| Luminosity | 3,548[7] Template:Solar luminosity |
| Surface gravity (log g) | 1.05[9] cgs |
| Temperature | 3,500[7] K |
| Metallicity [Fe/H] | −0.10[9] dex |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| ψ Vir, 40 Virginis, BD−08°3449, FK5 1335, HD 112142, HIP 62985, HR 4902, SAO 139033[10] | |
| Database references | |
| SIMBAD | data |
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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 Script error: No such module "val"..[11]
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 Script error: No such module "val"..[14] There is a magnitude 8.3 companion at an angular separation of 0.04 arcseconds.[3]
References
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