Sergei Golyshev (AFK during workdays)
First light-2013: Leaving Jupiter
The first chance to fire my BIG GUN since... November! was spent on the old faithfull Jupiter.
Some calculations: the diameter of Jovian disk on the image is 143,75+/-3,9 (SD) pixels and its apparent size was 46,68 arcseconds. That means that I have equivalent angular pixel size of 0,32 arcsec. Assuming that my 150 mm wide telescope really produces its 0,9 arcsecond optical resolution, I have 2,8 pixel per resolved separation that perfectly satisfies the requirements of Nyquist(-Shannon-Kotelnikoff-Whittaker) theorem.
Weather was windy and a bit chilly. The wind was causing slight wobbling of the setup and lubricant in the mount was freezing :)
The size of planet's disk is apparently smaller than that of 10th of November.
Aquisition time: 02.01.2013 19:19 MSK (GMT+4).
Equipment:
Celestron NexImage CCD + 5x Barlow lens on Celestron Omni XLT 150 mm Newtonian telescope mounted on Celestron CG-4 GEM (German equatorial mount) with RA drive.
Aperture 150 mm
Focal length 3750 mm
Tv = 1/25 seconds
Av = f/25
ISO N/A.
Exposures: 3000+
Processing: Images were stacked with Registax 6. Atmospheric dispersion was removed prior to wavelet processing by channel-wise realignment in ImageJ. Next gentle wavelts were applied to generate RGB image. It was used to generate channel sum and subjected to second wavelet sharpening. After all this the resulting image was used as luminance component. So this is fake LRGB image.
Notes: Image orientation is partially restored upon data from Jupiter 2 program. Registax processing results in nasty set of rings that are revealed after application of wavelets.
First light-2013: Leaving Jupiter
The first chance to fire my BIG GUN since... November! was spent on the old faithfull Jupiter.
Some calculations: the diameter of Jovian disk on the image is 143,75+/-3,9 (SD) pixels and its apparent size was 46,68 arcseconds. That means that I have equivalent angular pixel size of 0,32 arcsec. Assuming that my 150 mm wide telescope really produces its 0,9 arcsecond optical resolution, I have 2,8 pixel per resolved separation that perfectly satisfies the requirements of Nyquist(-Shannon-Kotelnikoff-Whittaker) theorem.
Weather was windy and a bit chilly. The wind was causing slight wobbling of the setup and lubricant in the mount was freezing :)
The size of planet's disk is apparently smaller than that of 10th of November.
Aquisition time: 02.01.2013 19:19 MSK (GMT+4).
Equipment:
Celestron NexImage CCD + 5x Barlow lens on Celestron Omni XLT 150 mm Newtonian telescope mounted on Celestron CG-4 GEM (German equatorial mount) with RA drive.
Aperture 150 mm
Focal length 3750 mm
Tv = 1/25 seconds
Av = f/25
ISO N/A.
Exposures: 3000+
Processing: Images were stacked with Registax 6. Atmospheric dispersion was removed prior to wavelet processing by channel-wise realignment in ImageJ. Next gentle wavelts were applied to generate RGB image. It was used to generate channel sum and subjected to second wavelet sharpening. After all this the resulting image was used as luminance component. So this is fake LRGB image.
Notes: Image orientation is partially restored upon data from Jupiter 2 program. Registax processing results in nasty set of rings that are revealed after application of wavelets.