NN Dra (Eclipsing binary)

RA: 13h 04m 03.00s, DE: +65° 15' 24.01" (196.0125000000, 65.2566700000)

AsasSnV: ASASSN-V J130403.25+651523.3, Ato: ATO J196.0129+65.2566, Gaia: Gaia DR3 1678727829233760768, Gcvs: NN Dra, Gsc: GSC 04169-00448, Nsvs: NSVS 2689370, Tic: TIC 142374043, TwoMass: 2MASS J13040297+6515243, Ztf: ZTF J130403.12+651523.8, Other: NSV 6080

Data:
  • Constellation: Dra
  • Variability type: EW
  • Maximal brightness (Mag): 12.340 (R)
  • Minimum brightness (Mag): 12.980 (R)
  • Brightness in secondary minimum (Mag): 12.900 (R)
  • Astrophysical interest: Sudden period changes
  • Created: 9/4/2007
  • Created by: admin
Show list of observations >>
Periodic elements:
  • Period (d): 0.382870540000000
  • Epoch (HJD): 2451285.81940
  • Secondary Epoch (HJD): 2451286.01083527 (est.)
Change log:

9/24/2026, Filip Walter:

  • Secondary Epoch: 51285.86 → Null
  • Epoch: 51285.669 → 2451285.8194
  • Period: 0.382879 → 0.38287054
  • Declination: 65.2567777778 → 65.25667
  • Right ascension: 196.0124166567 → 196.0125
  • Name: NN → NN Dra
  • CI: Ztf: Null → ZTF J130403.12+651523.8
  • CI: TwoMass: Null → 2MASS J13040297+6515243
  • CI: Tic: Null → TIC 142374043
  • CI: Other: Null → NSV 6080
  • CI: Nsvs: Null → NSVS 2689370
  • CI: Gsc: Null → GSC 04169-00448
  • CI: Gcvs: Null → NN Dra
  • CI: Gaia: Null → Gaia DR3 1678727829233760768
  • CI: Ato: Null → ATO J196.0129+65.2566
  • CI: AsasSnV: Null → ASASSN-V J130403.25+651523.3

1/29/2026, Filip Walter:

  • Astrophysical interest: Possible period changes → Sudden period changes

9/21/2025, Filip Walter:

  • Astrophysical interest: Nothing → Possible period changes

Chart
NN Dra
Source: The STScI Digitized Sky Survey, FoV: 15 x 15 arcmin
Number of observations

88 x

Number of observers

14 x

Last observed before

265 days

O-C diagram
Times of minima / maxima - including records from the original O-C gateway  
P: M = 2451285.8194 + 0.38287054 * E
S: M = 2451286.01083527 + 0.38287054 * E
ID HJDmin Error (+/-) UTCmin Epoch O-C (d) P/S Phot. band Observer Publication Note Instrument
Phase curve
Comments

Timeline