[Aavso-photometry] Single Measurement vs. Time Series

[Yenal Ogmen]

Hi all, I wanted to add related question to Richard's
one: when doing single measurement, is it better to
calculate stdev of check star from 5 frames or
calculate K-C from that 5 frame as an error?

Thank you.

--- Richard 'Doc' Kinne <rkinne at aavso.org> wrote:

> Dear All,
> 
>      in January I made a short series, about 75
> minutes in length, of  
> images of Z AND.  Due to time constraints I reported
> a single  
> observation to HQ with an error of 0.010 mags
> derived from the  
> standard deviation of K-C from the first 4
> measurements.  I revisited  
> the series and did measurements on the series at 2
> minute intervals,  
> obtaining a std dev of K-C of 0.027 mags for 32
> measurements.   
> Initially, the comp and check star mags were
> relatively steady around  
> 9.1 and 11.2, but then started to drop off to 9.4
> and 11.5 at the mid  
> point, and then rapidly fall to 10.2 and 12.4 at the
> end.  Z AND  
> shows no significant variation throughout in
> relation to the comp and  
> check stars, meaning it tracks their behavior.
> 
>        I am looking for recommendations on whether
> or not to report  
> this as a time series, or just let the single
> observation stand.   
> Thanks.
> 
> 
> Rich Harvan HAV
> 
> 
> 
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Yenal Öðmen
  Green Island Observatory Homepage
www.geocities.com/yenalogmen 
Geçitkale 
North Cyprus


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