Bibliography home page Constellation list

Today is Wed May 1 3:41:45 CEST 2024JD 2460431.5706597
 

GEOS RR-Lyr database

Type star name:  
 

BK Cas

 

GCVS data
GCVS number 180088
Variable star identification005307.38+643603.2

Coordinates:

RA/DEC (J2000.0) 13.2807495 64.6008889 degrees
Proper motion (RA/DEC) 0 0 arc sec/year
Epoch of coordinates 1983.846
Reference for coordinates GSC

Variable star characteristics:

Type RRAB
magnitudes at max 13.3 , at min 14.8 (p)
Elements: 2438317.375 + 0.3902672 E
M-m 20 %
spectrum
reference for type [06930] V.P.Goranskij, E.V.Kazarovets, S.Yu.Shugarov, Perem Zvezdy Prilozhenie 1, N6, 477, 1973
reference for finding chart [06930] V.P.Goranskij, E.V.Kazarovets, S.Yu.Shugarov, Perem Zvezdy Prilozhenie 1, N6, 477, 1973

Cross identification

AN 1931.0356
GSC 4025.01131
SVS 0265

Elements

By default the database elements are used in O-C calculation. If several elements are available, the user may choose one of them. A form allows the user to enter his/her own elements. If they are given they become the current elements until the button "Reset to database elements" is pressed.

Elements avalable in database:

2438317.375 + 0.3902672 E (GCVS (Kholopov et al.; 1988-2006))
2454019.4667 + 0.39027 E (Sódor et al., 2007b)
2438317.375 + 0.3902672 E (GCVS (Samus et al.; 2011))

  Origin Period Quad. term  
Type Elements:  
  Or
 

Current elements: 2438317.375 + 0.3902672 E

4 maximums


Symbol colors: green: photographic; yellow: visual; red: photoelectric; bleu: ccd; no color: unknown

Plot O-C as function of HJD Cycle number

Toggle period shift ON OFF

  HJD   Unc.   O-C   E   period   Ref.   Observer   meth.   comments  
    (day)     shift  
  456950.3970      0.006      0.083      -5076950      0      Ferrand, Vandenbroere, 2015      S. Ferrand      vis          
  456952.3420      0.006      0.077      -5076945      0      Ferrand, Vandenbroere, 2015      S. Ferrand      vis          
  457230.2199      0.0015      0.084      -5076233      0      J.F. Le Borgne, 2015, pr. com.      Kenji Hirosawa      ccd      V filter     
  457276.2713      0.0023      0.084      -5076115      0      J.F. Le Borgne, 2015, pr. com.      Kenji Hirosawa      ccd      V filter     

No image Access to Simbad data

Lightcurve from AAVSO data
Enter JD of beginning and end of lightcurve and click on the " AAVSO lightcurve " button.
  No image


Today is Wed May 1 3:41:45 CEST 2024