101 Virginis

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

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)4.28 ± 0.41[1] mas
Distance760 ± 70 ly
(230 ± 20 pc)
Luminosity1,078[5] L
Temperature3,682[5] K
Other designations
CY Boötis, IRAS 14150+1529, AG+15° 1445, GSC 01469-01456, BD+15° 2690, HD 125180, 2MASS J14172843+1515478, TYC 1469-1456-1, NSV 6613, UBV M 20098, GC 19284, HIP 69829, PPM 130465, GCRV 8358, HR 5352, SAO 100956.
Database references
Data sources:
Hipparcos Catalogue,
Bright Star Catalogue (5th rev. ed.)

101 Virginis is a red giant variable star in the Boötes constellation. It was originally catalogued as 101 Virginis by Flamsteed due to an error in the position.[6][7] 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.[8]

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.[9]


  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. 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:1108.4971Freely accessible. 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:0901.0934Freely accessible. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698. 
  5. ^ 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:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  6. ^ Davies, H. S. (1905). "Flamsteed and Piazzi Identities". Popular Astronomy. 13: 423. Bibcode:1905PA.....13..423D. 
  7. ^ Wagman, M. (1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18: 209. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. 
  8. ^ 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. 
  9. ^ 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. 

External links[edit]