2018-09-11 ========== jupiter_lr_rgb_1024_rotated.png ------------------------------- This is a color composite from 3 images of Jupiter taken with the CDK700 at Mount Kent Observatory by Rhodes Hart. The color images were created by John Kielkopf with post-processing in AstroImageJ. The original images have a scale of 0.41 arcseconds per pixel, and were exposures through Sloan i', r', and g' filters for 0.01 seconds at 09:09 to 09:12 UTC. Since there rotation of the planet between images that is not compensated in the color composite, there is a small blurring east-west that is greater than the atmospheric blurring. The original fits file images were cropped to center on Jupiter and processed by Lucy-Richardson deconvolution to improve the resolution. The deconvolved images were contrast-enchanced by unsharp masking and combined into a single color image that is resampled with 4x the original pixel scale so that the final image is 0.1 arcseconds per pixel. The color mapping is Sloan i' -> red Sloan r' -> green Sloan g' -> blue which brings out the Great Red Spot and the contrast between the features that are brighter in the near infrared than they are in the blue-green. The palete approximates the visual appearance of Jupiter but is not entirely realistic. jupiter_r_satellites.png ------------------------ This is a cropped image from an original 1 second exposure in the Sloan r' band taken at 2018-08-11 09:07:52 UTC. The image immediatedly preceded the images taken to make the color composite of the planet. It is in the original rotation of the camera to the sky so that south is to the upper left, west to the lower left of the frame. The satellites from lower left to upper right are Callisto (IV) farthest from Jupiter on the west side Europa (II) on the west Io (I) closest to Jupiter onthe west side Ganymede (III) by itself on the east side The fits image from which this cropped image was taken is jupiter_r_00025_d.fits. The image has been corrected for dark count but has not otherwise been processed and the satellites are not saturated on that image. Some faint background stars are also visible when the image is studied with fits viewing software such as AstroImageJ.