[AZ-Observing] Re: Photometric Night Definition
- From: Jeff Hopkins <phxjeff@xxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 12 Feb 2007 16:45:24 -0700
Hello Rick,
Actually some of the best nights are just that. Some nights look
clear and near perfect yet the sky is very unsteady and the
photometric readings vary considerably. I have learned to watch the
satellite data and if it looks like there will be clearing to just go
set up and be patient. I have been rewarded with excellent skies most
of the time.
Jeff
At 15:55 -0700 02/12/2007, Rick Tejera wrote:
>Jeff,
>
>I'd be interested to know how many times you get better photometry "between
>the clouds" than on Clear Nights? I'd guess that after a storm system moves
>through it clears the sky pretty well. Have you found this to hold water/
>
>Clear Skies
>
>Rick Tejera
>President, Editor SACnews
>Saguaro Astronomy Club
>Phoenix, Arizona
>www.saguaroastro.org
>saguaroastro@xxxxxxx
>
>-----Original Message-----
>From: az-observing-bounce@xxxxxxxxxxxxx
>[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Hopkins
>Sent: Monday, February 12, 2007 12:29 PM
>To: az-observing@xxxxxxxxxxxxx; hubble_edwin@xxxxxxxxx; isac_81@xxxxxxxxxxx;
>keith@xxxxxxxxxxxxxxxxx
>Subject: [AZ-Observing] Re: Photometric Night Definition
>
>While I have no doubt there is at least one official criteria for a
>photometric night, to me it means being able to obtain good
>photometry.
>
>Take last night, it was nearly completely overcast at sunset. Shortly
>thereafter there were breaks in the clouds. I doubt few would say it
>was a photometric night, but indeed it was (between the clouds).
>
>Many nights I do BTCP (between the clouds photometry) and get
>excellent results. Last night of 3 sets of readings the V has a data
>spread standard deviation of 0.0026, B 0.0031 and U of 0.0055
>magnitudes. Last night was certainly a photometric night between the
>clouds (PNBTC).
>
>Jeff
--
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.
www.hposoft.com
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