[AZ-Observing] Re: Two spots on Jupiter

Paul,
 

According to SkyMap, it looks like the shadow you saw near Callisto, was
actually the shadow of Ganymede, Which passed over the disc earlier. In
fact, Around 1950, Both satellites were visible on the face of Jupiter.
Callisto's shadow would not show on the disc until 0128 5 Aug ending at
0515.

 

Here's a table I ran in SkyMap showing the times of the events:


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine6> 2008 Aug 04 17:05

III

Transit start


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine7> 2008 Aug 04 19:28

IV

Transit start


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine8> 2008 Aug 04 19:38

III

Shadow transit start


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine9> 2008 Aug 04 20:18

III

Transit end


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine10> 2008 Aug 04 22:55

III

Shadow transit end


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine11> 2008 Aug 04 23:03

IV

Transit end


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine13> 2008 Aug 05 01:28

IV

Shadow transit start


 
<file:///C:\Documents%20and%20Settings\Richard%20Tejera\Local%20Settings\Tem
p\SMPLine17> 2008 Aug 05 05:15

IV

Shadow transit end

 

Whether it is possible, I won't say, I'd imagine a better alignment of the
sun Jupsat system it may, But it looks like tonight you got a moon and a
different moon's shadow. Still worth the price of admission in my book, thin
as it is ;)

 

BTW, If your Still up around 0230, you should be able to see Callisto's
Shadow & Io's Shadow transiting together. Let me know, I'm going to sleep.

 

 Clear Skies

Rick Tejera

Editor SACnews,

Public Outreach Coordinator

Saguaro Astronomy Club

Phoenix, Arizona

www.saguaroastro.org

saguaroastro@xxxxxxx 

 

-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Paul Lind
Sent: Monday, August 04, 2008 21:29
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Two spots on Jupiter

 

Is it possible to see both Callisto and it's shadow both on the face of
Jupiter at the same time?   That's what seems to be happening right now.
There are two dark spots very slowly moving across Jupiter's northern
hemisphere.  

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