chegg angular resolution detect earth astrometry

The focal length is 2032 mm so to have the resolution equal 1 pixel then the pixel needs to be 5 to 6 microns. Just make sure your tracking is accurate enough to handle it.Įdited by Astrojedi, 24 March 2016 - 07:53 PM.Īngular resolution is approximately = 4.5'/aperture diameter in inches. in the 1'/pixel to 2'/pixel if using a sensitive enough camera and doing short exposures. Nevada has a very clear dry climate most of the time so I would recommend a higher sampling rate i.e. We are also south enough to avoid the worst of the Jet Stream which helps seeing. 2-3'/pixel sampling when stacking very short exposures (<15s) with my ASI224 (which has 3.75 micron pixels). Here in San Diego when we get dry clear nights with good seeing I see a clear difference in 1'/pixel vs. Higher sampling is never bad (unless you are sacrificing too much sensitivity) but undersampling always hurts detail.

Ultimately the 2'/pixel is only a rule of thumb primarily for long exposure imaging to balance sensitivity with detail. The appropriate sampling rate is a function of many different factors and also what you are trying to achieve.

Chegg angular resolution detect earth astrometry