BL Dra (Eclipsing binary)

RA: 19h 40m 24.61s, DE: +60° 55' 13.10" (295.1025416567, 60.9203055549)

Data:
  • Constellation: Dra
  • Variability type: E
  • Maximal brightness (Mag): 11.900 (P)
  • Minimum brightness (Mag): 12.200 (P)
  • Brightness in secondary minimum (Mag): 11.900 (P)
  • Astrophysical interest: Possible period changes
  • Created: 7/1/1997
  • Created by: admin
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Periodic elements:
  • Period (d): 0.402665000000000
  • Epoch (HJD): 51276.94500
  • Secondary Epoch (HJD): 51277.14600
Change log:

9/6/2025, Filip Walter:

  • Astrophysical interest: Nothing → Possible period changes

Chart
BL Dra
Source: The STScI Digitized Sky Survey
Number of observations

19 x

Number of observers

9 x

Last observed before

213 days

O-C diagram
Times of minima / maxima - including records from the original O-C gateway  
P: M = 2451276.945 + 0.402665 * E
S: M = 2451277.146 + 0.402665 * E
ID HJDmin Error (+/-) UTCmin Epoch O-C (d) P/S Phot. band Observer Publication Note Instrument
Phase curve
Comments

Timeline