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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: 2 Sketches of Jupiter 11/22+23/12 new [Re: Dean Norris]
      #5540988 - 11/26/12 08:33 PM

Dean, great! A few weeks ago I sketched that rift, if memory serves, at about CM II 270. The latest, if the time was entered correctly, was closer to CM II 240. If it stretches to CM II 340, that makes it even longer. In any case, I have no doubt it's about 60 degrees. CM II does shift noticeably within a few days, so I'd believe the beginning is different from earlier observation. I am just not sure which way it's progressing, toward 240 or toward 300? It may be at 280 as you say and my time input was off. Off the cuff, thinking about some festoons near the GRS, they do /seem/ to move toward the trailing edge - in the direction indicated by festoons as they spill into the EZ. That would be increasing along CM II longitude, right? Interesting, lemme check...

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starrancher
Carpal Tunnel
*****

Reged: 06/09/09

Loc: Northern Arizona
Re: 2 Sketches of Jupiter 11/22+23/12 new [Re: azure1961p]
      #5542528 - 11/27/12 05:31 PM

Quote:

Quote:

Just came in for break . GRS is crossing the meridian at this point . Only took out the classic Tasco 60mm . Seeing could be a tad better as past 91x is pretty much empty magnification . Took it up to 122x but really didn't see anymore than at 91x . Fine details are just real tough in the 60mm although 9 regions are easy to spot including the two darkened polar regions . A slight bit of festooning in the equatorial zone from time to time and the GRS showing with its lightened notch into the SEB . All in all not too bad for a tiny scope .




Ive got a color sketch Im posting tomorrow night made with my 70mm that echoes your finds sans the festoons and not for lack of love but I couldnt reel em in. .Our mags and seeing sounded similar too. Bravo on your festoons catch.

Pete




Thanks Pete . That 60mm Tasco 7T is 54 years new . Was built the year I was born in '58 , so that in itself is a cool deal . The optics are vintage Royal Astro that are always highly acclaimed . This little jewel is an amazing performer .
Looking forward to seeing your sketch . It amazes me how you guys can do that in the dark at the eyepiece .


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saemark30
Pooh-Bah


Reged: 02/21/12

Re: 2 Sketches of Jupiter 11/22+23/12 new [Re: Dean Norris]
      #5542602 - 11/27/12 06:35 PM

Dean,
What scope are you using? Very good detail.
Quote:

Here are 2 sketches, one of the GRS region the
Clear and steady skies. Dean


Sketch #1 11/22/12 7:25 -7:50 UT CM l 136.30 CM ll 184.51 CM lll 238.53

171x no filter Apodizing Screen Seeing 2.5 - 2 Transparency 4 - 5 hazy with passing clouds



Sketch #2 11/23/12 8:57 - 9:20 UT CM l 350.44 CM ll 30.53 CM lll 84.84

171x no filter Apodizing Screen Seeing 2.5 Transparency 5

Santa Cruz, CA




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Dean Norris
Carpal Tunnel
*****

Reged: 11/05/08

Loc: Santa Cruz, Ca
Re: 2 Sketches of Jupiter 11/22+23/12 new [Re: saemark30]
      #5542988 - 11/27/12 10:33 PM

Saemark30,

Thank you very much. My scope is 10" f/6 Newtonian made by Cave 1971. I did some modifications like a 3 vane spider, Protostar 1.83" secondary,
flocking and a Moonlite focuser. This telescope over the years has given many fine views.

Good luck on your observations of Jupiter. Dean


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Dean Norris
Carpal Tunnel
*****

Reged: 11/05/08

Loc: Santa Cruz, Ca
Re: 2 Sketches of Jupiter 11/22+23/12 new [Re: Dean Norris]
      #5543045 - 11/27/12 11:05 PM

Norme,

I don't think your timing is off for the beginning of the NEB rift. I was only able to time the end of the rift as it passed over the meridian. The 280 degree was an estimation for the beginning of the rift. Lately I've been doing some timings of features. But I will have to wait until a series of storms pass through.
I've read that the NEBs border's jet stream blows towards the preceding limb whereas the NEBn jet stream blows towards following limb side. The NEB rift being in the middle must be effected by both jet streams. It would be interesting to see a Hubble video of this feature.

The other night I was able to sketch the rift again and will post this tomorrow when I get a chance.

Hope you have clear and steady skies. Dean


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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: 2 Sketches of Jupiter 11/22+23/12 new [Re: Dean Norris]
      #5543259 - 11/28/12 03:13 AM Attachment (14 downloads)

Dean, I'd love to see your rendition of the rift. I thought all the jets blew toward the trailing limb (system I, anyway.) Gotta look that up and see, you may be right. But, yes, the differential is pretty apparent.

Same to you, Dean, skies here have been marvelous. Tropical weather moved south, nothing but clear skies and clear sailing for the next few months. I can only wish that on everybody.

Edited by Asbytec (11/28/12 04:13 AM)


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