View Full Version : Dual Shadow Transit Across Jupiter - March 22

2012-Mar-22, 04:34 AM
The shadows of Jupiterís Galilean satellites #1 Io and #3 Ganymede will simultaneously transit Jupiter during the evening of 2012 MAR 22 in North American time zones. Io itself will be transiting at the same time. This will be the last dual shadow transit until the predawn hours of 2012 JUL 21.

Iíve created four preview graphics. One as viewed from above Jupiterís north pole and a second as viewed from Earth. The third is an event timetable. The fourth displays the dance of the satellites and shadows with Jupiter at 90-minute intervals. They can be seen by clicking http://www.curtrenz.com/jupiter

Photos and descriptions of the event would be welcome additions to this thread.

2012-Apr-17, 04:29 AM
20120601 http://www.curtrenz.com/jupiter.html

ok this is the thread i am Looking4 {the 05 06 links below no longer work Look UP ^
an aside to ASR7 (http://www.bautforum.com/showthread.php/2182-USS-CHANTICLEER-ASR-7-HUb/page13)
Math Question #1 (http://www.curtrenz.com/jupiter05.html) for 20120426 20:00
Q2 (http://www.curtrenz.com/jupiter06.html)
Anyway the QUESTIONS are about the Math used to generate the results
More to the point does the prediction match the results | THAT I WOULD LIKE TO KNOW
its very difficult to actually communicate with me for several reasons
i do check e-mail at pdx00782@yahoo.com on an irregular schedule /-/u

2012-Apr-17, 05:45 AM
Thank you for your interest. Of course my original post in this thread is outdated.

The time given for the current preview graphic is 2012 APR 26 at 20:00 CDT, which is the same as APR 27 at 01:00 UT. Other information linked on my Jupiter page shows a complete timetable of Galilean satellite data for a period of 24 hours. I won’t post the data for APR 26-27 until about midday before that night. Soon Jupiter will be moving behind the Sun and I will suspend posting new data for several weeks.

I obtained the high accuracy algorithm of J.H. Lieske from Astronomical Algorithms by Jean Meeus, Chapter 44, pages 304-315 (1998-2000): http://gan.doubleclick.net/gan_click?lid=41000613802220351&pubid=21000000000353112

That algorithm for obtaining the positions of Jupiter's Galilean satellites is very complicated. A simpler and lower accuracy algorithm appears earlier in that same chapter. The the lower accuracy algorithm is the one that most other sources use to calculate Galilean satellite data for publication.

I’ve programmed the high accuracy algorithm into my computer. I’ve created my own subroutines to turn the position data into output and graphics for Jupiter/Galilean satellite occultations, eclipses, transits and shadow transits.

My predictions have been very accurate; more so than found in most other sources. The Royal Astronomical Society of Canada intends to provide a link to my Galilean Satellite data beginning with their 2013 Observer’s Handbook. You can judge the accuracy for yourself with a telescope on April 26. Please let me know your results.

2012-May-17, 11:13 PM
20120601 http://www.curtrenz.com/jupiter.html

THUR5/17 .1 My 0pology for not paying attention
Astronomical Algorithms by Jean Meeus, Chapter 44, pages 304-315
2: i will try to find the book at the library
3? & try to check in at least monthly 4:13 pdT

Pd (http://www.principiadiscordia.com/forum/index.php/topic,27356.30/msg,1068153.html)
Pd2 {this link to perigee.bas REV ? (http://www.principiadiscordia.com/forum/index.php/topic,31493.15/msg,1174347.html)
fri? 3:07 AM 5/18/2012 pdT yes i did find
528M495a at the library & can turn to chapter 44
HOWEVER: I Look at the problems differently see link?

perigee.bas from sky & telescope is a basic program
(? ALGORITHM ?} to compare2 chapter 50 page 355
Meaning i AM Lost already, i see no comparison YET

RANDOM PAGE FLIPPING p246 BASIC, Landgraf's, elliptical
i could not find my staring place asteroid \ nasa \&?
thus this ends today's 3x3 ?/?/? 4:06 AM 5/18/2012 1hr

Sat (http://www.principiadiscordia.com/forum/index.php/topic,31860.15/msg,1174592.html)