Robin Leadbeater wrote:

"Doink" wrote in message
...

How are you able to measure magnitude so accurately? Seems a real
task---nice job.

Doink


High absolute accuracy is not so important in transit measurements, just the
ability to keep everthing stable enough to measure small changes over a few
hours. This is done by comparing the brightness of the varying star in the
images with a nearby reference star .

Robin,

Typically with photometry we need two reference stars (comparison and
calibration). Which star(s) did you use?

Anthony.


Robin