AC UMi (Eclipsing binary)

RA: 16h 13m 19.86s, DE: +81° 23' 35.70" (243.3327499900, 81.3932499997)

Data:
  • Constellation: UMi
  • Variability type: EA
  • Maximal brightness (Mag): 12.650 (R)
  • Minimum brightness (Mag): 13.300 (R)
  • Brightness in secondary minimum (Mag): 12.900 (R)
  • Astrophysical interest: Possible period changes
  • Created: 2/21/2008
  • Created by: admin
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Periodic elements:
  • Period (d): 0.643410000000000
  • Epoch (HJD): 51453.60300
  • Secondary Epoch (HJD): 51453.92500
Change log:

10/27/2025, Filip Walter:

  • Astrophysical interest: Nothing → Possible period changes

Chart
AC UMi
Source: The STScI Digitized Sky Survey
Number of observations

6 x

Number of observers

1 x

Last observed before

192 days

O-C diagram
Times of minima / maxima - including records from the original O-C gateway  
P: M = 2451453.603 + 0.64341 * E
S: M = 2451453.925 + 0.64341 * E
ID HJDmin Error (+/-) UTCmin Epoch O-C (d) P/S Phot. band Observer Publication Note Instrument
Phase curve
Comments

Timeline