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Finding Central Meridians

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#1 Lunatiki

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Posted 12 July 2019 - 05:26 PM

Hello everyone,

     I'm getting the new laptop set up with all the software I'll be needing and I can't seem to find a program to get Saturn's CM. I found one for Jupiter and one for Mars. Would be nice to have one program that does all 3. Thanks!

 

Joel



#2 Tom Glenn

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Posted 12 July 2019 - 05:40 PM

The software Winjupos, which is frequently used for derotation of images, also does exactly what you are interested in.  On Saturn there are three coordinate systems and you can get all three with Winjupos.  The program is also good for general ephemeris data and moon positions.  Just enter the time and date and you will get the data.  You can also use the program to make measurements on your image, and create polar projections with fairly accurate coordinates overlaid on the image, in addition to the general derotation capabilities.  There is a bit of a learning curve to using it, since the software is somewhat outdated and doesn't have a flashy user interface, but it is very useful and not difficult.  


Edited by Tom Glenn, 12 July 2019 - 05:40 PM.

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#3 PirateMike

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Posted 12 July 2019 - 06:04 PM

There is a bit of a learning curve to using it, since the software is somewhat outdated and doesn't have a flashy user interface, but it is very useful and not difficult.  

"Old software" beats "no software" any day.

 

 

Miguel   8-)

 

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#4 RedLionNJ

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Posted 12 July 2019 - 09:30 PM

Most (okay, maybe not "most", but many) planetarium applications will also tell you the CM values for any point in time. TSX, Guide, etc.

 

As indicated above, Winjupos also has a spectacularly good ephemeris feature. I don't find the UI that 'clunky', but it may be a matter of personal taste.

 

I am sure there are also a plethora of iOS and Android apps for those who prefer more mobile technology.



#5 kevinbreen

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Posted 13 July 2019 - 04:11 AM

I’ve just googled central meridian....pardon my ignorance but why is it of interest ?

I’m clearly missing out on something.

#6 Tom Glenn

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Posted 13 July 2019 - 04:26 AM

I’ve just googled central meridian....pardon my ignorance but why is it of interest ?

I’m clearly missing out on something.

If you know the longitude of the central meridian in any image, then you can superimpose a coordinate system on the planet.  An example would be in the projection maps you see created in Winjupos.  Features can then be tracked over time by different observers.  Because atmospheric features such as storms don't remain fixed, it is useful to have an accurate coordinate system placed on the image to track the feature.  


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#7 kevinbreen

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Posted 13 July 2019 - 08:13 AM

Cheers Tom


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