We used the Madrona Peak Obs 0.6m Ritchey to get a 15min summed Rc image of this star last night. Submitted our measurement of Rc=19.399 (0.094). Will have to sum more 5min images to go deeper next time skies clear. This one is a challenge.
-Walt Cooney (cwt)
Looks like I am the other observer and I agree-- this one is definitely faint. I have it at mag 19.447 on Feb 24-- 24 minutes total using the 0.9-meter SARA at Kitt Peak.
Tom (rth)
well I tried. Celestron C14 Edge HD 10 minute subs in R for several hours. Moonlit sky, unable to detect it at all..Following is a stacked image..My Observatory can go down to about 20.5 Mag on good nights Last night was NOT a good night..Bright Urban Los Angeles Sky. I tried posting a picture here but it didn't work
My Madrona Peak .6m images have been one hour total integration time with an Rc filter. The 11 measurements so far have ranged from 19.2 to 20.1, but those numbers are biased to the bright side. I'm keeping the measurement aperture small to eliminate at least some of the galaxy glow, but I'm not attempting to subtract the underlying glow from the aperture. Hopefully the measurements are still useful as an indicator of whether the star is in outburst or not.
-Walt
AAVSO Alert Notice 853 announces an observing campaign beginning immediately on the SDOR variable AT 2000ch (LMi). Please see the notice for details and observing instructions.
There are threads for this campaign under the following AAVSO forums:
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Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ