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PostPosted: Sun, 24-04-16, 9:50 GMT 
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Here is a relevant paper co-authored by Pluto expert Marc W. Buie with a summary table of the 1984 - 1990 Mutual Pluto-Charon Event Season:
http://www.boulder.swri.edu/~buie/biblio/pub015.pdf

Just to provide a little flavor about these impressive eclipses:

starting with Pluto:
***********************
Click first on images (1920 x 1080) and then hit your browser's fullscreen key (F11 in FF)]
Attachment:
pluto_02281987_zoom3.jpg
pluto_02281987_zoom3.jpg [ 144.06 KiB | Viewed 757 times ]


Attachment:
eclipse02.27.1987.jpg
eclipse02.27.1987.jpg [ 47.14 KiB | Viewed 757 times ]


...and now Charon's turn on 03.03.1987
*********************************************
Attachment:
Charon_03.03.1987_zoom.jpg
Charon_03.03.1987_zoom.jpg [ 198.4 KiB | Viewed 754 times ]


Historical:
***********
...and here is a historical comparison of mutual events in the Pluto-Charon system that I did long long time ago (>12 years!) with Celestia (not celestia.Sci ;-) ). Given all the new Spice-based precision of 2016, it may be curious to compare...I checked the top-leftmost and the bottom left images and found coincidence!

Attachment:
pluto-charon-evts-7.jpg
pluto-charon-evts-7.jpg [ 36.17 KiB | Viewed 752 times ]



Enjoy,
Fridger

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PostPosted: Wed, 18-05-16, 20:56 GMT 
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Hi all,

it's time to become quantitative about testing Pluto-Charon mutual events in celestia.Sci using the latest Spice kernels (see JohnVV's posts).
.
Here is a nice one from the seminal paper by Marc Buie et al.
http://www.boulder.swri.edu/~buie/biblio/pub015.pdf

+++++++++++++++++++++
1987 Aug 13 @ 8:17 UTC
+++++++++++++++++++++
[By all means, click on image for a bigger display!]
Attachment:
pluto-ecl_1987_8_13_big.jpg
pluto-ecl_1987_8_13_big.jpg [ 66.56 KiB | Viewed 675 times ]


The agreement of the celestia.Sci simulation with the actual earth-bound observation
is again perfect! In the foreground you see Charon, the shadow of which eclipses a region on Pluto. As you can read off the date / time display of this mid-eclipse image, the agreement between prediction and observation could hardly be better.

Here is another one, this time Pluto's shadow is eclipsing Charon
+++++++++++++++++++++++++++++++++++++++++
1986 Dec 29 @ 11h 51 ...14h 0m (max!)... 16h 26m
+++++++++++++++++++++++++++++++++++++++++
[By all means, click on image for a bigger display, then hit your browser's fullscreen key (F11)]
Attachment:
charon-ecl_1986_12_29_big.jpg
charon-ecl_1986_12_29_big.jpg [ 166.82 KiB | Viewed 671 times ]


This time the event lasts much longer. My screenshot with celestia.Sci is from near eclipse maximum around 14h 29m 30 s. The agreement with the prediction is again very satisfactory...

There are many more mutual event predictions that will help to assert critically the accuracy of the involved orbits. Note that the Light Travel delay (LT) of 04 h 30 m 12.462 s is again crucial for obtaining the above agreement!

Fridger

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