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
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pluto-ecl_1987_8_13_big.jpg [ 66.56 KiB | Viewed 541 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
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charon-ecl_1986_12_29_big.jpg [ 166.82 KiB | Viewed 537 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
) of 04 h 30 m 12.462 s
is again crucial for obtaining the above agreement!