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Today is Sat Apr 27 22:21:09 CEST 2024JD 2460428.3480208
 

GEOS RR-Lyr database

Type star name:  
 

DH Hya

 

GCVS data
GCVS number 420131
Variable star identification090014.83-094644.1

Coordinates:

RA/DEC (J2000.0) 135.061791 -9.7789167 degrees
Proper motion (RA/DEC) -0.019 -0.002 arc sec/year
Epoch of coordinates 2000
Reference for coordinates Tyc2

Variable star characteristics:

Type RRAB
magnitudes at max 11.36 , at min 12.65 (V)
Elements: 2431176.244 + 0.4889982 E
M-m 13 %
spectrum A4-F4
reference for type [03634] G.A.Lange, Astron Tsirk N238, 1963
reference for finding chart [00464] C.Hoffmeister, AN 240, 193, 1930

Remarks

Delta(S) = 7.

Cross identification

AN 1930.0274
GSC 5448.00107

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:

2431176.244 + 0.4889982 E (GCVS (Kholopov et al.; 1988-2006))
2431176.244 + 0.4889982 E (GCVS (Samus et al.; 2011))

  Origin Period Quad. term  
Type Elements:  
  Or
 

Current elements: 2431176.244 + 0.4889982 E

1 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  
  457358.2868      0.0016      -0.195      -4036452      0      J.F. Le Borgne, 2015, pr. com.      Kenji Hirosawa      ccd      V filter     

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Lightcurve from AAVSO data
Enter JD of beginning and end of lightcurve and click on the " AAVSO lightcurve " button.
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Today is Sat Apr 27 22:21:09 CEST 2024