[Aavso-photometry] Time series help needed

[bailyhill at aol.com]

Hello Yenal;

You would do nearly the same thing when you do a time series.  If you 
can take individual images of the desired exposure--these are typically 
30 secs to 120 secs--the person organizing the campaign will tell what 
works best.

Then take one of the comp stars, do a std dev on it.  This is a 
reasonable representation of your real error.  It will be much higher 
than the "photon statistics error", which of course is one component of 
the overall real error.

If you cannot take exposures of the desired length, then you can stack 
a small quantity of them, say six or so, and then compute the same 
statistics, using the average of this small group of images.

Clear Skies
Gary


-----Original Message-----
From: Yenal Ogmen <yenalogmen at yahoo.com>
To: Aavso-photometry at mira.aavso.org
Sent: Mon, 3 Dec 2007 05:23:29 -0800 (PST)
Subject: [Aavso-photometry] Time series help needed






Hi all,

I see that sometimes "time-series" observations are
needed. I would like to do them therefore I need to
know essential things about these observations.
Especially about statistical error calculation. Now I
take 5 composite images and calculate standard
deviation of them to submit as error. But how this can
be done for time-series?

Thank you.
Clear Skies.

Yenal Öðmen
  Green Island Observatory Homepage
www.geocities.com/yenalogmen
Geçitkale
North Cyprus



       
_________________________________________________________________________
___________
Never miss a thing.  Make Yahoo your home page.
http://www.yahoo.com/r/hs
_______________________________________________

Aavso-photometry mailing list
Aavso-photometry at mira.aavso.org
http://www.aavso.org/mailman/listinfo/aavso-photometry




________________________________________________________________________
More new features than ever.  Check out the new AOL Mail ! - 
http://o.aolcdn.com/cdn.webmail.aol.com/mailtour/aol/en-us/text.htm?ncid=aolcmp00050000000003