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101 Virginis
Star in the constellation Boötes / From Wikipedia, the free encyclopedia
101 Virginis is a red giant variable star in the Boötes constellation, currently on the asymptotic giant branch.[7] It was originally catalogued as 101 Virginis by Flamsteed due to an error in the position.[8][9] When it was confirmed as a variable star, it was actually within the border of the constellation Boötes and given the name CY Boötis.[3]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 17m 28.4519s[1] |
Declination | +15° 15′ 48.167″[1] |
Apparent magnitude (V) | 5.84[2] (5.74 - 5.90[3]) |
Characteristics | |
Spectral type | M3IIIa[2] |
B−V color index | 1.678[2] |
Variable type | SRb[3] |
Astrometry | |
Radial velocity (Rv) | −11.30[4] km/s |
Proper motion (μ) | RA: 14.27[1] mas/yr Dec.: 8.80[1] mas/yr |
Parallax (π) | 3.3735 ± 0.1766 mas[5] |
Distance | 970 ± 50 ly (300 ± 20 pc) |
Details | |
Radius | 76.78[5] R☉ |
Luminosity | 1,078[6] L☉ |
Temperature | 3,682[6] K |
Other designations | |
Database references | |
SIMBAD | data |
Data sources: | |
Hipparcos Catalogue, Bright Star Catalogue (5th rev. ed.) |
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The variability is not strongly defined but a primary period of 23 days and a secondary period of 340 days have been reported.[10]
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.[11]