Re: second order extinction

Posted by rrgem on Mar 15, 2017; 6:25pm
URL: http://astroimagej.170.s1.nabble.com/second-order-extinction-tp634p636.html

Hi Karen
thank you so much for your kindness. You are right. We are are planning to use the measurement technique that you described.
Our goal is to obtain precise and accurate apparent magnitudes in order to be able to send it to the AAVSO database or to be used to support small research projects. Sometimes it's difficult to find comparison stars with the same color index in the ccd frame, so it would be very useful to apply also the second order extinction correction within AIJ to improve photometric accuracy.
Marta