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Tips on measuring central meridian transits on Jupiter

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#1 Diomedes

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Posted 12 July 2020 - 10:45 PM

Hi, I just read about measuring  central meridian transits of features on Jupiter.  I’m curious to know if anyone has tried it ? Any tips?



#2 Dean Norris

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Posted Today, 12:14 AM

Diomedes,

 

I've been doing CM timings since 2009. The GRS, barges on the NEB, Oval BA, White Spot Z, and festoon bases on the NEBs. I collected the data on these features and recently because of having time on my hands ( pandemic), I charted the data on some graphs.. I'm currently working on determining the rotation rates of the features I timed. It's a fun way to learn more about the fascinating planet Jupiter.

 

Have a good timepiece by the scope along with clipboard, and light to record your timings.

 

A clock drive can help but not necessary.

 

Use a moderate to high magnification.

 

On large features, time the preceding, center, and following edge of the feature.

 

Here's my drift charts for the GRS.

 

#1 GRS drift chart 11:14:11-5:14:14.jpeg

 

#2 GRS drift chart 2:25:15-6:21:17.jpeg

 

#3 GRS drift chart 5:27:18-8:21:19.jpeg

 

I hope you find this useful.

 

Dean

 

 

 


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#3 SabiaJD

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Posted Today, 10:52 AM

 I have time a few features on the planet over the years. BTW Nice work Dean.

 

The ALPO handbook has a section on the method,   the link here covers the basics. 

 

https://skyandtelesc...bserving-guide/


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