From: Milton Aupperle <milton@outcastsoft.com>
Date: August 9, 2008 10:15:16 AM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Great Red Spot...?
Hi Mark;
I don't know about the GSR from Australia, but this site
http://www.skyandtelescope.com/observing/objects/planets/Transit_Times_of_Jupiters_Red_Spot.html
indicates it's at a longitude of 127°
Those circular "darker" halos on Jupiter are dust spots on the CCD or possibly the IR filter. You need to either blow them off with compressed air or a soft camel hair camera / lens brush. For longer focal lengths you need to keep the dust off.
Hope that helps..
Milton J. Aupperle
President
ASC - Aupperle Services and Contracting
Mac Software (Drivers, Components and Application) Specialist
#916, 742 Kingsmere Crescent S.W.
Calgary Alberta T2V2H8
1-(403)-453-1624
www.outcastsoft.com
On 9-Aug-08, at 9:44 AM, Mark Gaffney wrote:
I was disappointed not to catch the transit of the GRS. According to Australian Sky & Telescope the transit should`ve happened at around 11.47 pm tonight. That`s 21.22 pm + 53 minutes or 1 & 2/3 minutes late for every degree west of 121 degrees. This apparently assumes the Red Spot is at Jovian System II Longitude 121 degrees and hasn`t moved elsewhere. This is what I`m getting for 11.32 & 11.41pm. Maybe I was a little early? Mark.