EF Dra (Eclipsing binary)

RA: 18h 05m 30.40s, DE: +69° 45' 16.00" (271.3766666617, 69.7544444444)

Data:
  • Constellation: Dra
  • Variability type: EW/KW
  • Maximal brightness (Mag): 10.480 (V)
  • Minimum brightness (Mag): 10.820 (V)
  • Brightness in secondary minimum (Mag): 10.480 (V)
  • Astrophysical interest: Sudden period changes
  • Created: 7/14/1997
  • Created by: admin
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Periodic elements:
  • Period (d): 0.424031000000000
  • Epoch (JD): 48491.57800
  • Secondary Epoch (JD): 48491.79000
Change log:

2/23/2025, Filip Walter:

  • Astrophysical interest: Nothing → Sudden period changes

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

86 x

Number of observers

14 x

Last observed before

0 days

O-C diagram
Times of minima / maxima - including records from the original O-C gateway  
P: M = 2448491.578 + 0.424031 * E
S: M = 2448491.79 + 0.424031 * E
ID HJDmin UTCmin Epoch O-C (d) P/S Phot. band Observer Publication Note Instrument
Phase curve
Comments

Timeline