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Thursday, 6 July 2017

[BAA-ebulletin 00979] The Great Red Spot as Juno flies in

BAA electronic bulletin

Jupiter's Great Red Spot as Juno flies in
The Juno orbiter is due to fly about 9000 km above the centre of the
Great Red Spot (GRS) on Monday night, about 12 minutes after its
closest approach to the planet on July 11 at 01:55 UT. NASA have
posted two press releases, one about the fly-over,
and one showing some superb mid-infrared images of the GRS taken by Dr
Glenn Orton and colleagues on May 18 (and earlier).
These images can be compared with superb visible-light views taken by
Christopher Goon May 19, one of which is shown in a new report posted
on the Jupiter Section web pages (BAA web site > Jupiter Section >
Jupiter in 2016-17 > Report no.13; unfortunately these e-bulletins
cannot give links).
Chris Go's high resolution revealed the regular pattern within the GRS,
whose internal rotation could be observed over less than an hour, as
shown in an animation of maps made by Michel Jacquesson. The report
also shows a very recent image of the GRS (by Gary Walker), which is
at exactly the predicted longitude to be below Juno's track. A preview
of the July 11 flyby (Perijove-7)was posted on the Section web pages
as Report no.12. Meanwhile,the best ground-based image of Jupiter ever
taken was produced on June 11 by Damian Peach with a team of observers
using the 1-metre telescope at the Pic du Midi Observatory in the
French Pyrenees. They were holding a EuroPlanet-sponsored workshop to
promote use of the telescope by advanced amateurs, and produced
an equally outstanding image of Saturn. TheJupiter image does not show
the GRS, but it does show red oval BA and a wealth of intricate detail
in many other features.
Note to members:
We are posting items on the BAA Jupiter Section web pages
quite frequently during this apparition with the Juno mission ongoing,
but rarely send out e-bulletins. So if you would like to keep
up-to-date with Jupiter and Juno, please either check the BAA webpage
and Section web page weekly, or follow 'BAA Jupiter Section' on
Facebook, or contact the BAA Jupiter Section Director via the BAA web
site to become a member of the Section and of our emailing list.
John Rogers


John H. Rogers,
Jupiter Section Director,
British Astronomical Association.

BAA-ebulletin mailing list visit:
(c) 2017 British Astronomical Association

Good Clear Skies
Colin James Watling
Various Voluntary work-Litter Picking for Parish Council (Daytime) and
also a friend of Kessingland Beach (Watchman)
Real Astronomer and head of the Comet section for LYRA (Lowestoft and
Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland
Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)
Lyra Main Website:

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