Processing Images – Saturn (Part 1 of 2)

The 3 exposures shown below at the end of this post were taken by the Hubble telescope on the 22nd of March 2004.

Saturn 2004-03-22 (Click to enlarge)

What was of interest was the the black stripe shown on the ring at the top left of each of the exposures. There were a few reasons for why this stripe was there so we looked at what Saturn would have looked like on the 22nd of march 2004 to see if there were any moons which may have cast their shadow on the rings.

We didn’t find any so it is more than likely that the black stripe on the 3 exposures was caused by a cosmic ray ….but this is unusual to be caught on all 3 exposures in the same position and time. It could also be assumed that there had been some flaw in the pictures .

Anyway, the picture on the left shows the appearance of Saturn back in 2004. Now the exposures below show Saturn leaning on it’s side at a 90 degree angle. So when we do the same to the image on the left side , you will see that after turning it 90 degrees it roughly matches the images taken by Hubble below.

When you look at the 3 exposures below, they may look the same as each other…… but if you look closely at the planet itself, you can see differences in the detail shown on each exposure and these differences are what we will use when processing this image of Saturn.

From left to right the exposures were taken using the filters F658N (red) on the left, F330W (Green) in the middle and F435W (Blue) on the right.

These will be used for image processing to come up with the final image which will be shown in the second part of this post.

Saturn exposures 2004-03-22 (Click to Enlarge)

TARGNAME= ‘SATURNA                       ‘ / proposer’s target name
RA_TARG =   9.697855583711E+01 / right ascension of the target (deg) (J2000)
DEC_TARG=   2.280717987250E+01 / declination of the target (deg) (J2000)

DATE-OBS= ‘2004-03-22′         / UT date of start of observation (yyyy-mm-dd)

TIME-OBS= ’09:20:00’           / UT time of start of observation (hh:mm:ss)

EXPSTART=   5.308638889557E+04 / exposure start time (Modified Julian Date)

EXPEND  =   5.308638948909E+04 / exposure end time (Modified Julian Date)

EXPTIME =            50.000000 / exposure duration (seconds)–calculated

~ by sydneystargazers on July 2, 2010.

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