From: Jim Chung <jim_chung@sunshine.net>

Date: September 21, 2009 8:35:48 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Eros Light Curve Data Captured


Hi Terry,


BTW, I also enjoyed your Jupiter moon occultation project.  I believe you were hoping to determine something about their atmospheres, did you post any results?


I was thinking that since the orbital period of Io is 42.456 hrs, it will take exactly half that time for Io to just clear the disc of Jupiter during a transit and then just reappear 21.228 hrs later.  We would have to sync our time with the US Atomic Clock and hopefully be able to observe a lag of about 5 seconds.


Jim




Quoting Terrence Redding <tredding@mac.com>:


Jim, I believe the predicted time is corrected for an earth bound  observer.  Though you could report observed time and actual time to  emphasize speed of light time lag/delays.



Terry - W6LMJ - 14.287


Terrence R. Redding, Ph.D.

Redding Observatory South, West Palm Beach, Florida

http://olt.net/learningstyle/Site_2/Learning_Style_Research.html

How do amateur astronomers learn?


American Association of Variable Star

Observers (AAVSO): RTN http://www.aavso.org/






On Sep 21, 2009, at 9:27 AM, Jim Chung wrote:


Milton,


I really enjoyed your Eros light curve presentation, astronomy is one

of those rare areas where amateurs can still contribute meaningful

scientific information.


My son is hoping to do a science fair project where we use AstroIIDC

to record the reappearance of Io from behind Jupiter and by using

really precise time recording track (I believe now available on

AstroIIDC) determine the delay between the expected time and

observation time to determine an estimate for the speed of light.


Jim