[Aavso-photometry] Single Measurement vs. Time Series

[Steven Orlando]

----- Original Message ----- 
From: "Steven Orlando" <sorlando at sorlando.com>
To: "Yenal Ogmen" <yenalogmen at yahoo.com>; <photometry at mira.aavso.org>
Sent: Saturday, April 12, 2008 12:32 PM
Subject: Re: [Aavso-photometry] Single Measurement vs. Time Series


> Is it possible to report as a time series? Amd of so, how?
>
> Steve
> ----- Original Message ----- 
> From: "Yenal Ogmen" <yenalogmen at yahoo.com>
> To: "AAVSO Photometry" <aavso-photometry at mira.aavso.org>
> Sent: Saturday, April 12, 2008 11:39 AM
> Subject: Re: [Aavso-photometry] Single Measurement vs. Time Series
>
>
> 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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