From: "milton_aupperle" <milton@outcastsoft.com>

Date: November 5, 2010 12:20:24 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Partial Light Curve for pulsating variable star CY AQ

Hi Folks;

I shot a partial light curve for pulsating variable star CY AQ tonight:

http://groups.yahoo.com/group/Astro_IIDC/files/Other/CY_AQR_PhotometryCurvePlot.png

That's the raw curve plot. Photometric measurements done with Astro IIDC (Measure Differential Photometrics..) and then the results plotted up in "Plot".

Unfortunately clouds moved in at the end (about 5 hours earlier than CSK predicted) so I could not complete the entire curve, just 58 minutes worth (total period is about 89 minutes). Each point in the curve is 25 seconds apart. You can see just how fast it brightens up at the end, which is 1.5 magnitudes (2.7 times) in just over 21 minutes. Imagine if the sun brightened up by 270% in 21 minutes...

Seeing was mediocre with stars jumping +/- 6 arc seconds, which is why we get saw tooth patterns. I was using the Luma filter on my C8, 1150 mm FL, Grasshopper Camera cooled to 0°C.

TTYL..

Milton Aupperle