| Re: IDL for planetary photometry [message #71121] |
Wed, 02 June 2010 09:48 |
spacermase
Messages: 13
Registered: June 2010
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Junior Member |
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On Jun 2, 12:13 pm, pp <pp.pente...@gmail.com> wrote:
> I could be missing something, but it seems that all you need is to add
> the flux of every pixel containing the object. Since there is no
> atmosphere in the way, there is no sky flux being added together. They
> are usually observed nicely isolated, with nothing around them to
> contaminate their flux. Then if you want absolute magnitudes, you
> could just take the ratios of those fluxes to those of some standard
> star observed by the same instrument (Cassini does occasionally look
> at stars, for photometric and pointing calibration).
Oh, right. Duh. Why didn't I think of that? Too used to ground based
observations, I suppose...
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| Re: IDL for planetary photometry [message #71123 is a reply to message #71121] |
Wed, 02 June 2010 09:13  |
penteado
Messages: 866
Registered: February 2018
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Senior Member
Administrator |
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I could be missing something, but it seems that all you need is to add
the flux of every pixel containing the object. Since there is no
atmosphere in the way, there is no sky flux being added together. They
are usually observed nicely isolated, with nothing around them to
contaminate their flux. Then if you want absolute magnitudes, you
could just take the ratios of those fluxes to those of some standard
star observed by the same instrument (Cassini does occasionally look
at stars, for photometric and pointing calibration).
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