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> Close Encounter With Comet 67p > May Reveal Origins Of Life On Earth
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brmv
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#171
Dec 5 2014 02:27pm
Quote (Vetsu @ 5 Dec 2014 20:22)
I.hope they get off that rock safely
us humans need that sample
this is not a sample return mission
but hopefully philae will wake up when it gets warmer there and can perform some more experiments
brmv
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#172
Dec 6 2014 03:57am
more and more nutcases get on the act, here an article to smile about
http://www.ibtimes.co.in/ufo-enthusiast-finds-alien-building-rosetta-comet-67p-video-616306
brmv
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#173
Dec 7 2014 08:15am
Comet on 2 December – NavCam
This four image mosaic comprises images taken with Rosetta’s NAVCAM on 2 December from a distance of 30.1 km from the centre of Comet 67P/Churyumov-Gerasimenko. The image resolution of the mosaic is about 3.1 m/pixel, and it has been cropped to measure 4.5 x 3.6 km.
also note:
It provides an almost “face-on” view onto the large depression on the smaller lobe, its boulder-strewn surface albeit enshrouded in shadow. On the other hand, the internal walls are seen in quite some detail. It is thought that Philae’s final touchdown site might be located close to the rim of this depression but further high-resolution imaging is still being obtained and analysed to confirm this. This depression, measuring almost 1 km across, was once considered as candidate landing site B.
brmv
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#174
Dec 12 2014 06:08pm
Deuterium-to-hydrogen in the Solar System
The different values of the deuterium-to-hydrogen ratio (D/H) in water observed in various bodies in the Solar System.
Deuterium is an isotope of hydrogen with an added neutron. The ratio of deuterium to hydrogen in water is a key diagnostic to determining where in the Solar System an object originated and in what proportion asteroids and/or comets contributed to Earth’s oceans.
The data points are grouped by colour as planets and moons (blue), chondritic meteorites from the Asteroid Belt (grey), comets originating from the Oort cloud (purple) and Jupiter family comets (pink). Rosetta’s Jupiter-family comet is highlighted in yellow. Diamonds represent data obtained in situ; circles represent data obtained by astronomical methods. The lower part of the graph shows the value D/H measured in molecular hydrogen in the atmosphere of the giant planets of the Solar System (Jupiter, Saturn, Uranus, Neptune) and an estimate of the typical value in molecular hydrogen for the protosolar nebula, from which all objects in our Solar System formed.
The horizontal blue line shows the value of the ratio in Earth's oceans, which has been determined to be 1.56 ×10–4. Rosetta’s ROSINA instrument measured the water vapour emanating from Comet 67P/Churyumov–Gerasimenko and found it to be 5.3 x 10–4, more than three times greater than for Earth’s oceans.
The discovery fuels the debate on the origin of Earth’s oceans and whether asteroids or comets played the bigger role in delivering water.
brmv
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#175
Dec 14 2014 07:19am
after quite a long delay, here a colour image of comet-67P:
A colour image of Comet 67P/Churyumov-Gerasimenko composed of three images taken by Rosetta's scientific imaging system OSIRIS in the red, green and blue filters. The images were taken on 6 August 2014 from a distance of 120 kilometres from the comet.
and
Rosetta’s OSIRIS team have produced a colour image of Comet 67P/Churyumov-Gerasimenko as it would be seen by the human eye. As anticipated, the comet turns out to be very grey indeed, with only slight, subtle colour variations seen across its surface.
To create an image revealing 67P’s “true” colours, the scientists superposed images taken sequentially through filters centred on red, green, and blue wavelengths.
However, as the comet rotated and Rosetta moved during this sequence, the three images are slightly shifted with respect to each other, and are taken from slightly different observing perspectives. Painstaking work is needed to superimpose the images accurately, which is one reason it has taken so long to come up with the first meaningful colour image of 67P/C-G.
brmv
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#176
Dec 15 2014 06:32pm
rosetta is getting closer to the comet again, now at ~20km - here one image in two formats, first as montage and then as mosaic:
... taken from a distance of 20.1 km from the centre of Comet 67P/Churyumov-Gerasimenko on 10 December. The image resolution is 1.71 m/pixel and the individual 1024 x 1024 frames measure 1.75 km across.
brmv
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#177
Dec 16 2014 03:03pm
some of the latest results from the rosetta mission will be presented at the agu meeting in san franciscco
http://fallmeeting.agu.org/2014/
there will be live streaming from there for some of the sessions
brmv
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#178
Dec 18 2014 07:13pm
from the australian edition of the daily mail:
Three historic landings: This graphic shows the team's current best guess at how events unfolded. The probe landed on the comet at around 3.30pm GMT on the 12th of November but then bounced twice - first to a height of 0.62 miles (1km) and then to a much lower height of 65ft (20 metres) before coming to rest. It is currently thought to be about 0.62 miles (1km) from its intended landing site
and
Professor Bibring also revealed a reprocessed Civa image taken by Philae at the American Geophysical Union's Fall Meeting in San Francisco.
The image, named 'Perihelion Cliff', depicts one of the walls looming over the robot, with reflections from Philae shown by glare marks.
brmv
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#179
Dec 20 2014 07:33am
Daring Philae Comet Landing Named Top Breakthrough of 2014
http://www.space.com/28057-rosetta-comet-landing-science-breakthrough.html
brmv
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#180
Dec 23 2014 01:59am
better, sharper pictures are to come next year, from an article form the daily mail:
Rosetta to swoop down on comet 67P: Daring manoeuvre will take probe just 4 miles above its surface - and provide even higher-res images
-This will be the closest Rosetta will come to 67P throughout its mission
-Scientists will be able to take images at a few inches (10 cm) per pixel
-As the comet becomes more active, it will not be possible to get so close
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