101 Virginis

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101 Virginis
Virgo constellation map.svg
Red circle.svg
Location of CY Boötis (circled)
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])
Spectral type M3IIIa[2]
B−V color index 1.678[2]
Variable type SRb[3]
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[5] mas
Distance970 ± 50 ly
(300 ± 20 pc)
Radius76.78[5] R
Luminosity1,078[6] L
Temperature3,682[6] K
Other designations
101 Vir, CY Boötis, NSV 6613, BD+15° 2690, GC 19284, HD 125180, HIP 69829, HR 5352, SAO 100956, PPM 130465, TYC 1469-1456-1, GSC 01469-01456, IRAS 14150+1529, 2MASS J14172843+1515478
Database references
Data sources:
Hipparcos Catalogue,
Bright Star Catalogue (5th rev. ed.)

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 Bootes and given the name CY Boötis.[3]

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]


  1. ^ a b c d Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  3. ^ a b c Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (1985). "The 67th Name-List of Variable Stars". Information Bulletin on Variable Stars. 2681: 1. Bibcode:1985IBVS.2681....1K.
  4. ^ Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics. 498 (2): 627. arXiv:0901.0934. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698.
  5. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  7. ^ Eggen, Olin J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  8. ^ Davies, H. S. (1905). "Flamsteed and Piazzi Identities". Popular Astronomy. 13: 423. Bibcode:1905PA.....13..423D.
  9. ^ Wagman, M. (1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18: 209. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305.
  10. ^ Percy, J. R.; Dunlop, H.; Kassim, L.; Thompson, R. R. (2001). "Periods of 25 Pulsating Red Giants". Information Bulletin on Variable Stars. 5041: 1. Bibcode:2001IBVS.5041....1P.
  11. ^ Mason, Brian D.; Martin, Christian; Hartkopf, William I.; Barry, Donald J.; Germain, Marvin E.; Douglass, Geoffrey G.; Worley, Charles E.; Wycoff, Gary L.; Ten Brummelaar, Theo; Franz, Otto G. (1999). "Speckle Interferometry of New and Problem HIPPARCOS Binaries". The Astronomical Journal. 117 (4): 1890. Bibcode:1999AJ....117.1890M. doi:10.1086/300823.

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