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Interesting Jupiter Features 2/18/13

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#1 Dean Norris

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Posted 18 February 2013 - 09:38 PM

There some new features on Jupiter that are popping up. Last night 2/18/13 I was able to see a dark patch somewhat of a irregular circle on the border of the NPR on the NNTB. Normally I don’t see much in this region other than the NNTB belt on the border of the NPR. So this was a surprise to see an object in this area.

Close in longitude preceding the NNTB object, a dark spot on the NTBn was seen. I’ve observed a wavy edge to the NTBn. This was a dark spot that stood out more than the usual border on this belt.

WSA/B was situated between these objects in longitude which contrasted with these dark features. I looked for WSZ but was not able to see it. I wonder if they merged together.

On the SEBn I saw a dark nebulous oval that hung “down” into the EQZ. It was a little bigger than WSA/B in size. This is actually my second obsevation of this marking.

Here’s the CMll coordinates for these objects. CMl and CMll coordinates are given for the SEBn dark oval. Objects on the EQZ are CM l coordinates but I wanted to include the CM ll coordinates so you could see that all these features were pretty close to each in longitude. I hope you get a chance to see these things.

10” f/6 Newt 171x Apodizing screen Seeing 2.5 Antoniadia’s Scale Transparency 5


Dark spot on the NTBn CMll 11.60

WSA/B CMll 14.62

Dark patch on NNTB (NPR border) CMll 18.85

Dark nebulous oval on SEBn EQZ CMl 312.51 CM ll 49.67


#2 Kon Dealer

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Posted 19 February 2013 - 08:46 AM

Jupiter was really good last night.
A clear shadow transit (which moon?)
Also at the same time another moon emerging from behind Jupiter.

#3 azure1961p


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Posted 19 February 2013 - 08:41 PM


Nice report. It is odd to me when things "hang" into the EZ from the SEB as Im so used to seeing all projections and festoons via the NEB - still the SEB seems to contribute from time to time.


#4 Dean Norris

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Posted 20 February 2013 - 12:05 AM

Kon Dealer,

Check out S+T website for Jupiter's Moons and positions. Here's the link:

Thank you Pete,

I know what you mean. I thought it was unusual as well. I read in J. Rogers' book, "The Giant Planet Jupiter", that the "aspect of the equatorial region was reversed before 1910." The SEBn was highly disturbed whereas the NEBs was quiet.
I'm not saying that the feature I observed is signaling a reversal is under way in the EQZ, but it was odd seeing it. I also read that there is an occasional projection or white spot in this region so it does happen. I look forward to observing it again.


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