Outbreak spot and dark marking in SEB

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    Posted by Robin Vann at 03:03 on 2010 Nov 14

    There have been reports over the last two nights of a spot and a darksih structure in the SEB in Yahoo Group ALPO_Jupiter.I have had cloud these last 2 nights and on the night before had dreadful seeing (tropopause associated with an Atlantic system).Hopefully it is still high enough in our skies to enable us to observe any SEB revival.Robin Vann


    Posted by David Arditti at 13:53 on 2010 Nov 14

    Yes we have all been suffering from lots of cloud and terrible seeing when it clears.I managed to image on November 10 and captured the bright SEB spot (it was just next to Europa in transit). In binoviewers on the C-14 the spot was visible visually as well. Images from elsewhere since then have shown the development of the dark streak next to the spot, which looks to be the beginning of the propagation of the new SEB.David


    Posted by Tom Moran at 20:50 on 2010 Nov 17

    Hi.I am rather hesitant submitting images in this section because of the limited nature of my equipment for planetary use. I use a Skywatcher 120mm achromat at f8. However I think I may have caught the SEB dark marking and I would welcome comments either to confirm or not. The image was taken with a Toucam, x2 barlow and processed in Registax. I have expanded the image to 150% to show the suspect a little better. The image was taken on 15th Nov 2010 at 18:16 UT.Regards.Tom Moran


    Posted by Andrea Tasselli at 20:14 on 2010 Nov 18

    Yes, that’s the thing. Apparently everyone was out on monday!BestAndrea T.


    Posted by Tom Moran at 20:45 on 2010 Nov 18

    Thanks Andrea.Tom


    Posted by David Mottershead at 20:28 on 2011 Jan 20

    HelloOver the last two nights I have finally managed to do some observing in between the clouds!! The dark spot on Jupiters emerging SEB was clearly visible at 250x, and even at lower magnifications. Is the thinking that this is part of the SEB returning, or that the SEB will ‘grow’ out of this spot? Or is this dark sopt simply another marking/weather system on Jupiter. I don’t suppose that it’s the result of an unseen impact?


    Posted by Andrea Tasselli at 10:28 on 2011 Jan 21

    Hello David,Yes, in the most recently accepted theory the SEB returns starting from one (subsequently up to 3) location and then expanding to created the dark/light markings of SEBn and SEBs. So what you see as dark spot is in reality one of the source of the dark matter (maybe soot?) that will become part of the newly formed SEB.Andrea T.


    Posted by David Mottershead at 11:53 on 2011 Jan 22

    Thanks Andrea. Dr John Rogers (Director Jupiter section) also wonders whether I might have observed a satellite shadow (Io) as around the time I saw the dark spot on Jupiter Io was casting a shadow onto the surface (18:18 19-01-2011). If it was the shadow of Io, then that’s a first for me as I’ve never seen one of Jupiters moons shadows before.


    Posted by Robin Vann at 02:23 on 2011 Jan 23

    I too saw the Io shadow transit, observing at 18:00 on 19th. January. Observation details follow. Note that I could not discern a seperate north and south element to the SEB, presumably due to inadequate seeing.Jupiter: 19th. January, 2011Magnitude: -2.2Diameter: Equatorial: 36"; Polar: 34"Altitude: 32°; ?: 5.3 AU; Tilt: +2°CM1: 163.6°; CM2: 302.8°; CM3: 181.3°18:00 GMT, nautical twilightLimiting magnitude: 3.0Transparency: very transparentSeeing: AIIIConditions: clear, coldOrion Optics SPX200 f/6Baader Hyperion 5mm (240x)North Equatorial Belt strongly orange.South Equatorial Belt fainter and thinner, showing revival.Polar regions similar to South Equatorial Belt but slightly browner.Shadow transit of Io (L2 ­? 325°) discernable in moments of best seeing: actual transit not discernable.

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