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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 17m 28.4519s |
| Declination | +15° 15′ 48.167″ |
| Apparent magnitude (V) | 5.865 |
| Characteristics | |
| Spectral type | M3IIIa |
| U-B color index | 2.07 |
| B-V color index | 1.71 |
| R-I color index | 0.87 |
| Variable type | Variable star identification NSV 6613 § |
| Astrometry | |
| Radial velocity (Rv) | -10.4 km/s |
| Proper motion (μ) | RA: 15.33 mas/yr Dec.: 7.73 mas/yr |
| Parallax (π) | 3.22 ± 0.76 mas |
| Distance | approx. 1000 ly (approx. 310 pc) |
| Absolute magnitude (MV) | 7.538 |
| Details | |
| Mass | 0,4 M☉ |
| Radius | 0,5 R☉ |
| Luminosity | 0,04 L☉ |
| Temperature | 2,000–3,500 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
101 Virginis or CY Boötis is a variable star in the Bootes constellation. "Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed;" §
Position
References
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