DESCRIPTION OF THE IMAGES:
- a short report of my recent work -
Jupiter was observed at Calar Alto (Spain) during the impact
week in the near infrared wavelength band.
On these images an artificial grid is fitted, taking into account
the subearth point, the apparent radius, the flatness of the planet
and so on. (see Orig.png)
Once the grid is established, the image structures are enhanced
by the unsharp masking method:
The image is smoothed by convolution with a matrix kernel
and then subtracted from the original frame.
This works like a lowpass or a first deviation.
High spatial frequencies are enhanced.
(see unsh_msk.png)
When this is done, a projection to a cone takes place.
The cone is touching the planet at the averaged impact
latitude at -43.5 degrees in order to minimize distortion.
The images
16_22_08.png, 16_22_38.png, 17_19_53.png, 17_20_25.png
18_22_02.png, 18_20_11.png, 18_21_36.png, 18_21_46.png
18_22_45.png, 19_19_52.png, 19_20_06.png, 19_20_19.png
19_22_18.png, 20_19_31.png, 20_21_28.png, 21_19_38.png
21_21_39.png and 22_20_00.png
show these projections.
The filenames have the form date_hour_minute.
Please note:
- There are images in 1.7 micron and 2.3 micron included
- The south pole is always visible in the projections.
That is because the sub earth point was about 3 degrees
south of the equator, and the south pole was visible in
the original images, too.
- Only the southern hemisphere is projected to the cone.
- No combination to a allround map was attempted, because
the impact structures varied too fast with time, so you
cannot get a true allround image for one time.
- The coordinates are given in system III, the markers of
the impacts correspond to the publication of the HST team
(Science 267 p. 1290)
- system III is rotating slightly against the spots.
Muenchen, 24.8.95
Johannes Babion
