Re: Pixel scale adequate?

Posted by Rick_N. on Nov 11, 2021; 3:38pm
URL: http://astroimagej.170.s1.nabble.com/Pixel-scale-adequate-tp1672p1675.html

 Yesterday I was finding a magnitude for a SN using a DECaLS FITS image file. This has a scale of approximately 2" for a 4px radius aperture, or 8px diameter. This is OK and occasionally I use a 3pixel radius (6px diameter) aperture. Below that, say for a 2px radius, you have an amount of pixels that might not tell you much anyway as it is a square made up of 9 pixels.

This is using the 4m DECAM CTIO telescope. PanSTARRS is much the same. I guess what I'm saying is that the
highest number of pixels per arcsecond is what is required, so Camera 2 seems a good choice.