HD 123657

From Wikipedia, the free encyclopedia
  (Redirected from BY Boötis)
Jump to: navigation, search
HD 123657
(BY Boötis)

HD 123657
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 07m 55.75s
Declination 43° 51′ 16.03″
Apparent magnitude (V) 5.2[1]
Characteristics
Spectral type M4.5:III
U−B color index 1.66
B−V color index 1.59
R−I color index 1.66
Variable type Variable star
Astrometry
Radial velocity (Rv) -35.8 km/s
Proper motion (μ) RA: 11.73 mas/yr
Dec.: -29.76 mas/yr
Parallax (π) 7.01 ± 0.66 mas
Distance 470 ± 40 ly
(140 ± 10 pc)
Absolute magnitude (MV) 6.71
Details
Mass 0,4 M
Radius 0,5 R
Luminosity 0,04 L
Temperature 2,000–3,500 K
Other designations
BY Boötis, JP11 2471, AG+44° 1162, GSC 03040-00969, 2MASS J14075576+4351160, TYC 3040-969-1, BD+44° 2325, HD 123657, N30 3210, UBV M 19995, CSV 7099, HIC 69038, PLX 3214, UBV 12478, DO 34564, HIP 69038, PMC 90-93 957, FK5 1368, HR 5299, PPM Star Catalogue 53940, GC 19084, IRAS 14059+4405, RAFGL 1680, AAVSO 1403+44, GCRV 8285, IRC +40253, SAO 44901.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

HD 123657, or BY Boötis, is a variable star (4.98–5.33V).[2] This makes it a dim naked eye star. It has slow, irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities. The star is located near the end of the handle of the Big Dipper.

References[edit]

  1. ^ "BY Bootes". SIMBAD Astronomical Database. Retrieved 2013-11-16. 
  2. ^ "GCVS Query=BY Boo". General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2013-11-16. 

External links[edit]