[vsnet-chat 2086] Re: Plotting light curves

[Gianluca Masi <gianmasi@fr.flashnet.it>]

Dear Arne and Taichi,
thanks for your comments about my post.

>   BTW -- did you really take 1000 images on a single night?
> Amazing.  I can take about one image per minute or 600-700
> images in a typical night if I stay on the same object, but
> 200-300 frames/night is more typical.  Granted, my 1024x1024
> detector may take longer to read than your CCD, but it still
> means you were working pretty hard!

My CCD spends about 30 secs to download and save an image in full
resolution (765*510 pixels) and about 7 secs to do the same in mid res
(2*2 binning). On V603 Aql I was working in 2*2 binning, acquiring a new
frame every 15 seconds. The software automatically saves the pictures
and I can leave the instrument unattended. Unfortunately, to do so I
have to limit the integration time to max 10 secs (I have to try to
program the PEC feature of the mount). For stars fainter than V603 Aql I
have to change my strategy, using longer exposure times and using the
SBIG ST-7 autoguiding feature. 

This consideration offers me another question: to perform aperture
photometry, can I work in the 3*3 binning mode (with a scale of
3"/pixel, each binned pixel 27*27 microns), or can this affect the
accuracy of the results? This to limit further the tracking problems.

All the best,
Gianluca
-- 
***********************************************************************
* Gianluca Masi                           "Two things fill the soul   *
* Via Madonna de Loco, 47               with awe and reverence [...]: *
* 03023 Ceccano (FR)                     the starry sky above me and  *
* ITALY                                    the moral law within me"   * 
* email: gianmasi@fr.flashnet.it                                      *
* http://vsnet.eurolink.it/comets/                        I. Kant       *
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