tizianoniero.it Solar system HiRes images

Setup 1

My current setup that I use to perform hi-res imaging:

  • OTA: Celestron C14 "orange" on a self-made equatorial mount; aperture 355mm, focal length 3910mm, F11
  • Crayford focuser Baader Planetarium model SteelTrack for SC telescope, 2" model, 30mm course, motorized with a self-made focuser control based on Arduino Micro
  • Focal extender Televue Powermate 2X (2" model)
  • motorized filter wheel Starlight XPress with 7 slots for 31.8mm mounted filters
  • Set of filters LRGB Astrodon
  • Camera pointGrey Flea3 FL3-GE-03S1M, with Sony CCD sensor ICX618 monocromatic, 648x488, pixel size 5.6µm

Acquisition and post-processing software:

The theoric equivalent focal length is about 7800 (F22) with a sampling ratio of ~0.15 arcsec/pixel vs a resolving power (Dawes) of 0.33 arcsec (see here for the useful formulae I used to calculate these values); thus the Shannon (Kotelnikov-Nyquist-Shannon-Whittaker to be pedantic) theorem of sampling is substantially satified.

From measurements on the images of Jupiter I acquired in the 2013-2014 season these values are a bit different: at the opposition (image of 2013.12.16) Jupiter had an equatorial diameter of about 46.2" (from WinJUPOS ephemerides) which became an oval of 274 x 288 pixels; this gives sampling ratio of ~0.16 arcsec/pixel and an equivalent focal length of 7200mm, that in my opinion is a little subsampling. Maybe a EFL of 10000 is better, performing a little over-sampling without spreading the planet light over too much pixels (which requires less frame rate or more gain - both are bad for lucky imaging). With such EFL the image of Jupiter at opposition (diameter 46 arcsec) becomes an oval of 400 x 380 pixels.