101 Virginis
Template:Location mark Location of CY Boötis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.74 - 5.90[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M3IIIa[1] |
| B−V Template:Engvar | 1.678[1] |
| Variable type | SRb[3] |
| Astrometry | |
| Radial velocity (Rv) | −11.30[5] km/s |
| Proper motion (μ) | RA: 14.27[2] mas/yr Dec.: 8.80[2] mas/yr |
| Parallax (π) | 3.3735±0.1766 mas[6] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.98[1] |
| Details | |
| Mass | 1.2[7] Template:Solar mass |
| Radius | 76.78[6] Template:Solar radius |
| Luminosity | 1,078[8] Template:Solar luminosity |
| Surface gravity (log g) | 1.35[7] cgs |
| Temperature | 3,682[8] K |
| Metallicity | −0.31[7] |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, Bright Star Catalogue (5th rev. ed.) | |
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101 Virginis is a red giant variable star in the Boötes constellation, currently on the asymptotic giant branch.[4] Its apparent magnitude ranges from 5.74 to 5.9, making it faintly visible to the naked eye under good observing conditions. It was originally catalogued as 101 Virginis by Flamsteed due to an error in the position.[9][10] John R. Percy found it to be "marginally variable" in 1993.[11] When it was confirmed as a variable star, it was actually within the border of the constellation Boötes and given the name CY Boötis.[12]
The variability is not strongly defined but a primary period of 23 days and a secondary period of 340 days have been reported.[13]
CY Boo is listed in the Hipparcos catalogue as a "problem binary", a star which was suspected of being multiple but for which the Hipparcos observations did not give a satisfactory solution. Further observations have always shown it to be single.[14]
References
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External links
- VizieR: HR 5352
- Aladin: Image 101 Virginis