[Aavso-photometry] Observation Timing (new question)

[Jeff Hopkins]

Hello Yenal,

That is a good question and one I have wondered about. I will try 
experimenting and see how it works. The problem is while 
experimenting in house is it is hard to get dropped frames.

What I have done for photometry is set the Quality to 0 so all images 
get stacked. As I understand it the quality business is designed 
mainly for multiple fast exposures (sub-second) for bright objects 
like planets and the Moon. For Deep Sky Objects and photometry it may 
be better to not use the Quality function.

Jeff

At 01:25 -0700 08/22/2007, Yenal Ogmen wrote:
>Jeff,
>
>Thanx because I didnt know that Envisage records the
>end of first exposure time in FITS file. But what
>about end of total exposure time! How can we calculate
>it? For example, If you start your exposure at
>00:00:00, 10 images of 30 sec exposure should end at
>00:05:00 but since some of the frames does not
>included in the combine due to low quality, the actual
>exposure time is not 300 sec. SO how to find total
>exposure time?
>
>Thanx.
>
>Yenal Öðmen
>   Green Island Observatory Homepage
>www.geocities.com/yenalogmen
>Geçitkale
>North Cyprus

-- 
Jeff Hopkins
HPO SOFT
Counting Photons
http://www.hposoft.com/Astro/astro.html
Hopkins Phoenix Observatory
7812 West Clayton Drive
Phoenix, Arizona 85033-2439 U.S.A.
(623)849-5889
(623) 247-1190 (Fax)
www.hposoft.com