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

milton@outcastsoft.com

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.