I am looking for a variable with a period i can measure in 1 night by imaging and use of Astro Image J. In my search on the AAVSO i found RX And. On the Target tool the period is given as 0.209893 days, but when plotting past observations the period is 25 days. So what is the 0.2098 day period, and can i measure this ?
Tim, At the MAST site there is one 27 day photometry measurement for RX And in the TESS data. this record suggests there may be a period of 0.21 days. However there seems to be a lot of short term variation that makes pulling out the 0.21 period really difficult.
Tim, the Variable Star Section CCD Target List has some shorter period eclipsing binaries that might be useful if your aim is to test your system. The Beginner’s Category has a few systems that are 1 day or less. Ones around atm include EG Cep and TZ Lyr.
Given the short nights atm, you would need very short periods.
You could also look at any SU UMa dwarf novae that are in outburst. CVnet lists current ones. V1227 Her (UGSU, eclipsing, orbital period 0.064419 d (92.763 min)) might be a good one for you. There is a Journal paper on it here.