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Dawn's last mission extensions at Ceres, From XMO3 to EOM
tedstryk
post Jun 21 2017, 01:28 AM
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Another asteroid flyby would be cool, but I'd like to stay at Ceres to monitor it though perihelion to see if any changes/outgassing can be detected.


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nprev
post Jun 21 2017, 04:22 AM
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Perihelion is next April, and it does seem as if most water vapor detections by remote sensors have happened around then.

I concur with Ted.


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hendric
post Jun 21 2017, 06:40 AM
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I agree, stay at Ceres, but in a long term parking orbit that would allow for long term observations, with possible dips to a close orbit for flybys of anything interesting. I doubt we'll see significant changes, but maybe we'll get lucky. Occator crater is such an enigma, with the youth of the central mound. It is fascinating that two icy bodies (Ceres and Enceladus) that span an order of magnitude of sizes have localized activity.



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algorimancer
post Jun 22 2017, 01:35 PM
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QUOTE (djellison @ Jun 20 2017, 12:45 PM) *
Europa? No way it'll survive that far from the Sun and that sort of radiation dose...

True, only 28% as much solar energy at Jupiter (if I did the math right). Not sure if this is more a problem for propulsion or simply keeping the electronics running. And I have no expertise in judging the radiation problem, though (having been a software developer once upon a time), I do wonder whether radiation tolerant software could be developed -- perhaps using the RAM in a multiply redundant fashion -- but that's a broader problem.

Anyway, my vote would be to go elsewhere if possible, with the argument being that flyby observations of another -- never explored -- asteroid would be more valuable than spending a bit more time at Ceres.
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bobik
post Jun 23 2017, 06:29 AM
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QUOTE (nprev @ Jun 21 2017, 04:22 AM) *
Perihelion is next April, and it does seem as if most water vapor detections by remote sensors have happened around then.

"Ceres' Temporary Atmosphere Linked to Solar Activity ... Villarreal and colleagues showed that past detections of the transient atmosphere coincided with higher concentrations of energetic protons from the sun. Non-detections coincided with lower concentrations of these particles. What's more, the best detections of Ceres' atmosphere did not occur at its closest approach to the sun. This suggests that solar activity, rather than Ceres' proximity to the sun, is a more important factor in generating an exosphere."
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Daniele_bianchin...
post Jun 24 2017, 01:36 PM
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I would like to stay up Ceres to the perihelion. However, it depends on which asteroid destination Dawn team proposing.

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Holder of the Tw...
post Nov 1 2017, 10:54 PM
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It is confirmed that Dawn will stay at Ceres. From now until the end of mission they will try to get into a closer orbit than ever before (at periapsis in a highly elliptical orbit), photograph the southern hemisphere with favorable lighting and observe Ceres at it closest point to the sun. The last part is in April with the greater possibility of Ceres outgassing an atmosphere.

October 19 Press Release

October 31st Dawn Journal
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Explorer1
post Jan 11 2018, 09:03 PM
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Many details in the latest Dawn Journal: https://www.jpl.nasa.gov/blog/2017/12/dear-...awnce-travelers

Descent to lower orbit should start in April, though targeting of specific areas for higher resolution imagery is not guaranteed.
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Daniele_bianchin...
post May 9 2018, 08:10 PM
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Where is Dawn? Notices on extended mission? unsure.gif
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Explorer1
post May 9 2018, 10:46 PM
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I'm assuming no news is good news, they are still spiraling down to the final orbit. Should be in an intermediate orbit May 14th, according to the last journal, and then May 31st to finish off.

Journal update: http://www.planetary.org/blogs/guest-blogs...elliptical.html
Ceres reached perihelion, all is well with Dawn....
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Therion
post Jun 15 2018, 06:36 AM
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Sharpened and enlarged views of Occator crater's eastern rim, boulders and landslides from altitude 44-48 km:


Attached Image

from PIA22524


Attached Image

from PIA22525


Attached Image

from PIA22526
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Explorer1
post Jun 15 2018, 01:07 PM
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Really neat limb view here: https://photojournal.jpl.nasa.gov/catalog/PIA22522
New journal entry posted; looks like EOM is estimated for September, October at the latest:
http://www.planetary.org/blogs/guest-blogs...lling-down.html
Running out of hydrazine for manouevres is not exactly a dramatic end, but what a journey it will have been!
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Daniele_bianchin...
post Jun 18 2018, 08:45 AM
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QUOTE (Therion @ Jun 15 2018, 07:36 AM) *
Sharpened and enlarged views of Occator crater's eastern rim, boulders and landslides from altitude 44-48 km:


Attached Image

from PIA22524


Attached Image

from PIA22525


Attached Image

from PIA22526


do you think of new, close-up images of Mount Ahuna??
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Daniele_bianchin...
post Jun 18 2018, 08:47 AM
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QUOTE (Therion @ Jun 15 2018, 07:36 AM) *
Sharpened and enlarged views of Occator crater's eastern rim, boulders and landslides from altitude 44-48 km:


Attached Image

from PIA22524


Attached Image

from PIA22525


Attached Image

from PIA22526


This is new images of Ceres?I do not find them update dawn nasa, or in another webasite, why?
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charborob
post Jun 18 2018, 10:58 AM
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You can find those images here.
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