Fragment G Impact on Jupiter

At 5.51 pm Australian Eastern Standard Time, Zac Pujic, Greg
Bock and Peter Marples of the Southern Astronomical Society
in Queensland, Australia saw a plume projecting frmo the 
southern hemisphere of Jupiter, just south of the southern
temperate belt. It persisted for about 5-10 minutes after
which time it was no longer visible. Most fantastic however
is the fact that at about 6.30 pm AEST, all three of us,
including Gregg Thompson (authoer of the supernova search
charts) have now been able to see a large indentation in the
western (IAU convention) side of Jupiter. The indentation is
about as large as the Great Red Spot (which is not visible
at this time). It looks as though someone hit jupiter. At a later
time, about 6.40, a black spot, about as large as the white
oval FA, came into view in the southern hemisphere at 
approximately the same latitude as the south south temperate
belt.
        These observations have been confirmend by at least
six people and constitute amongst the first visual observations
of a plume and immediate post-impact cloud structure on Jupiter.

Members of the Southern Astronomical Society who have seen 
this include:

Zac Pujic
George Pujic
Gregg Thompson
Peter Marples
Greg Bock
Colin Drescher

More to come in a few minutes.

Zac Pujic
pujic@biosci.uq.oz.au
Brisbane, Queensland, Australia

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Observing from Helensvale, queensland...300mm Newt. and 350mm Newt.
both at approx. 200X.
Nothing at 07:28 UT, but suspect that at 07:42, we could see a small
bright plume at approx. 45 deg. sth. on the lovian following limb.
Rang. Z. Pujic at Kingston who confirmed the observation through
his 300mm Newt. at 07:48 UT.
It had faded by 07:55...It appeared to look like a small version of one
of the jovian moons, about as bright as them. In fact, it took on the 
appearance of a transit about to occur of one of the moons.
Anyone else see this?
Greg Bock
Peter Marples.
Southern Astronomical Society
Queensland, Aust.

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I forgot to mention that the size of the G impact
was about 26 degrees.  This translates roughly into
about 21,000 km in length based on the transit 
timings alone.

Zac Pujic

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|----------------------------------------------------------|
|  Zac Pujic                                               |
|  The University Of Queensland                *           |
|  Brisbane    Queensland                   *     *        |

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The impact site of fragment G was widely observed along the
east coast of Australia. The weather in Queensland was 
superb. I have managed to obtain very good CM transit
timings of the fragment G impact.
        The impact site itself is a spot about 3 arcseconds
in diameter and is extremely dark. This is surrounded by a 
white ring, and surrounding this white ring is a dark ring.
The centre of the whole complex lies at longitude 311.9 system
II degrees. I have made a very good drawing of this feature
when near the CM and will uuencode it onto sci.astro soon.
A plastic overlay grid indicated its latitude to be at
-47 +/- 2 degrees.        
        My transit timing should allow observers in other
countries to predict its position, and so to determine if
the visibily of these features, in visible light, is 
sustained over several rotations of the planet.

Observation detail are:

32-cm f/5.75 Newtonian
4.8-mm Nagler eyepiece
Magnification of 383
Seeing 7/10 (ALPO Scale)
Transparency 4/5 (ALPO Scale)
Observers: Zac Pujic and Colin Drescher
Location: Kingston, Queensland, Australia
Excellent collimation and transparency.
Wind - nil
Dew - very mild

Zac Pujic
pujic@biosci.uq.oz.au
Queensland, Australia.
|----------------------------------------------------------|
|  Zac Pujic                                               |
|  The University Of Queensland                *           |
|  Brisbane    Queensland                   *     *        |