[AZ-Observing] Re: One Last Picture - Trio of Galaxies in Leo and NGC 3628's tital tail
- From: Brian Skiff <bas@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 10 Apr 2006 23:18:48 -0700 (MST)
There was some discussion about this tidal-tail on 'amastro'
recently. It is pretty faint on the POSS-II film copies, so the
surface brightness is something light mag 27 per square arcsec in the
blue, probably between 25 and 26 in red (where most of your signal is
coming from). This is only 1 or 2 percent of the night sky brightness,
so argues well for "f/ratio is all that matters".
>> At F/3 my astrograph allows me to go extremely deep relatively quickly...
It was still five hours of combined exposures!
\Brian
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