Dawn's last mission extensions at Ceres, From XMO3 to EOM |
Dawn's last mission extensions at Ceres, From XMO3 to EOM |
Feb 26 2017, 01:25 PM
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#16
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Member Group: Members Posts: 423 Joined: 13-November 14 From: Norway Member No.: 7310 |
? Is expected to map temperatures of Ceres? I expected Already for long time :-/ Some pictures showing temperature have been generated. Here's a few that I am not sure if have been posted to the Photojournal, where you can find the others. Don't know about global or other larger maps, or time series of temperature. -------------------- |
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Mar 6 2017, 06:24 PM
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#17
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Member Group: Members Posts: 120 Joined: 26-May 15 From: Rome - Italy Member No.: 7482 |
Some pictures showing temperature have been generated. Here's a few that I am not sure if have been posted to the Photojournal, where you can find the others. Don't know about global or other larger maps, or time series of temperature. Thanks! 235 K -38°C 196 K -76°C However, the VIR images are of the last year. Ceres from this year begins to warm. The mission will not arrive to the maximum hot season of Ceres, but it could show more high temperatures in the next months.... |
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Mar 10 2017, 04:14 PM
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#18
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
ADMIN MODE: Moved four recent posts to the former "Water Vapor on Ceres" thread, which has been retitled "Ceres Geology". I think that discussion will continue long after the Dawn mission is completed. Thanks!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Apr 9 2017, 08:08 PM
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#19
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
Long-range image taken on March 28:
https://photojournal.jpl.nasa.gov/catalog/PIA21401 The brightness of the Occator faculae is pretty subdued at this lighting and viewing angle. |
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Apr 27 2017, 01:16 PM
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#20
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
Dawn has lost another (third) reaction wheel. But it looks like the opposition studies scheduled for Saturday the 29th will not be affected.
Dawn Status Report |
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May 2 2017, 04:15 AM
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#21
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Opposition observation data received! https://dawn.jpl.nasa.gov/mission/status.html
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May 3 2017, 04:20 PM
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#22
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
Man, if I ever win the lottery I'm going to work on making longer-lasting reaction wheels for space missions.
-------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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May 4 2017, 04:37 AM
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#23
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
There are many old spacecraft with great reaction wheels still working fine. But there must have been some batch - some particular hardware version rev that has hit Kepler and Dawn.
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May 18 2017, 10:08 PM
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#24
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Movie from opposition observations released: https://www.jpl.nasa.gov/news/news.php?feature=6845
New journal soon, presumably. |
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Jun 18 2017, 09:31 PM
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#25
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
Dawn's fate to be decided soon. Sending it off to a new asteroid is one option back on the table.
SpaceFlight Now article |
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Jun 19 2017, 05:36 PM
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#26
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
There are many old spacecraft with great reaction wheels still working fine. But there must have been some batch - some particular hardware version rev that has hit Kepler and Dawn. Yep, here's a comment from this article ( https://spaceflightnow.com/2017/06/17/dawn-...ecrafts-future/ ) Benjamin Hunt Mass and size are always an issue on spacecraft, especially deep space probes. Remember, however, that Dawn is an exception in terms of reliability...while reaction wheels have failed on other missions, they all (I believe) failed *after* completing their primary missions, and usually their extended missions. That said, the reaction wheels that have failed on Dawn and several other spacecraft that have made the news have been noted as coming from a bad batch made by Ithaco Space Systems. The decreased lifespans weren't understood until it was far too late to do anything about it, except for the Kepler mission; those wheels were sent back to Ithaco for preventative maintenance shortly before launch, but even that didn't fix the problem. Still, Kepler made it 4 years before failure compared to its planned 3.5 year mission, and it is still returning very useful science, even if at a reduced capacity. -------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Jun 19 2017, 08:29 PM
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#27
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
It would be fantastic news if the budget allowed for another asteroid flyby - I'd be pretty surprised though if the idea was approved.
Just a fun thought, would it be possible for Dawn to make it back to Earth? The idea of it matching orbits with the ISS and being examined up close after ten years of spaceflight is strangely thrilling (well to me at least ) |
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Jun 19 2017, 11:09 PM
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#28
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
It'd be possible to make it back to the Earth's vicinity, but probably only as a flyby. I don't see any practical way to get it into near-Earth orbit, even if the attitude control suite was fully operational.
No value added there. An asteroid flyby would be a much, much better option. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jun 20 2017, 05:25 PM
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#29
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
What about a Europa flyby, with some asteroid flybys en-route? Not sure about the gravity gradient, but it might be more efficient to head inward and get an orbital assist from Mars, or it might not. Given the current state of knowledge about Europa, we could probably learn a lot from a targeted flyby -- and probably 10 or more years before we have an orbiter in place.
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Jun 20 2017, 05:45 PM
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#30
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Europa? No way it'll survive that far from the Sun and that sort of radiation dose. It really is Adiona, or Ceres. That's honestly all the options.
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