Photometry - variable stars

[Richard N]

I have just got an EAA setup working and I thought I would experiment with some aperture photometry on variable stars. I took some images last night but I have now discovered that, in the main, the reference stars are not close enough to be on the sensor. This must be a pretty common problem? Is there a readily available list of stars that have close references? Sensor 42 x 24 arc minutes.

[JeremyS]

The distance to reference stars can be related to how bright the variable is. You might need to work on fainter variables. With my C11, the field is also very small on the chip, but I am measuring stars typically fainterthan mag 13, so there are usually plenty of comparison stars available. Comps should be similar brighter to the variable.