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Name
  DQ Her  
AAVSO UID
000-BCB-341 (173460 observations)  
Constellation
Hercules Sequence
J2000.0
18 07 30.26 +45 51 32.4  (271.87608 +45.85900) Search nearby
B1950.0 18 06 05.32 +45 51 01.8
Proper motion
RA: 5.3 +/- 5.0 mas/yDec: 16.7 +/- 5.1 mas/ySource: UCAC4
Galactic coord. 73.153 +26.444
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
2MASS J18073024+4551325 AAVSO 1804+45 AN 452.1934
Downes DQ Her UCAC3 120981849 X 18061+458
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Variability type
NB/DQ+EA
Spectral type WD+M3Ve
Mag. range
1.3 - 18.08 V
Discoverer J. P. M. Prentice
Epoch
31 Jul 1954 (HJD 2434954.9431) Ephemeris
Outburst 1934
Period 0.1936209219 d  (4.64690213 h)
Rise/eclipse dur. --
Remarks
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1 GCVS Team VB A (B 18.17m, F, 3.5", 132deg, optical?). Nebula, R = 10.5" (Halpha, 1981). After the main Max of the Nova a deep Min 13.0m (JD2426925) and a flat secondary Max 6.7m (JD2427065) were observed. Eclipsing variability: 14.61m - 18.08m, Min HeI = 2434954.9445 + 0.193620877d*E [J.E.Pringle, MN 170, 633, 1975.]. D = 0.20P, d = 0.000P. The light curve shape and Delta(M) var. Oscillations: Max HeI = JED2434954.785868 + 8.22521640d*10**(-4)*E - 2.8048d*10**(-16)*E**2 [J.Patterson, E.L.Robinson, R.E. Nather, ApJ 224, 570, 1978.], 0 <= Delta(m) <= 0.08m. Polarization changes with double oscilation period. Flickering: Delta(m) = 0.15m.
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References
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1 Light curve from CRTS/CSS (Drake et al. 2009, ApJ, 696, 870) 2009ApJ...696..870D
2 Z.B. Dai, S.B. Qian, 2009, A&A 503, 883 2009A&A...503..883D
3 R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) 2005JAD....11....2D
4 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 13.60H = 13.28K = 13.09J - K = 0.52
AllWISE W1 = 13.00W2 = 12.85W3 = 12.32W1 - W2 = 0.15
APASS-DR9 B = 14.61V = 14.44g' = 14.45r' = 14.35i' = 14.45B - V = 0.16
GALEX-DR5 FUV = 16.65NUV = 16.30FUV - NUV = 0.35
Images
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Supporting Documents
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Revision History
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4 Otero, Sebastian Alberto 2011-04-28 23:46 UTC Type from Downes (2001). Spectral type from Skiff (2010)
3 Admin, VSX 2009-09-08 22:10 UTC Update from [2009A&A...503..883D].
2 Admin, VSX 2007-03-23 15:52 UTC Discoverer added.
1 Admin, VSX 2005-12-17 20:33 UTC Initial database population.