[Aavso-photometry] NU Cyg

[Shawn Dvorak]

Keith Graham wrote:
> Hi,
>
> I have run up against a brick wall and hope someone on this list can point mein the right direction.
>
> I have been doing some TS photometry on the EB star NU Cyg. I am detecting about a 30 minute time differential between the ephemeris minima (both P & S) and my observed minima.  I began collecting data for this star on JD 2454402. I need to get the calculated times for P & S minima from that date forward. The only emphemeris I can even find this star on is the one located at http://www.as.ap.krakow.pl/ephem/. When I first began observing it, I did not record the calculated P & S minima times from the ephemeris because I really was not looking for any time differential.  But now that I appear to have detected an approx 30 minute differential, I would like to verify it. So, does anyone know where I might find past calculated minima for this star (or any others, for that matter)? I have contacted Gerry Smolyk, but he indicated that he had no data on this star.
>
> Thanks for any helpyou can offer.
>
> Cheers,
>
> Keith Graham
> GKA
>
>
>
>
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>   
Keith,

I made a couple of ToM measurements of this star in 2004:  HJD=53144.842 
and HJD=53278.649.  Both were close to spot-on to the GCVS elements, but 
the events for this short-period EB could well have drifted since then. 
The ephem generator (http://www.rollinghillsobs.org/tools.html) at my 
observatory web site generates predictions for EB and RR Lyrae star 
events for the observer's location.  It includes updated ToM or ToMx 
values for a number of stars and also incorporates Bob Nelson's improved 
elements for many EBs.

Shawn Dvorak (DKS)
Rolling Hills Observatory