Earth Return & Sample Science |
Earth Return & Sample Science |
Nov 4 2020, 12:23 PM
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#46
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Newbie Group: Members Posts: 8 Joined: 6-August 11 From: Bariloche, Argentina Member No.: 6102 |
Animated movie of the 'blast,' starting from where ground becomes visible again. Oh, this is the one that convinced me. Thanks! Guillermo -------------------- Guillermo Abramson
Leés español? Visitá mi blog! |
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Nov 4 2020, 05:12 PM
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#47
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Member Group: Members Posts: 437 Joined: 14-December 15 Member No.: 7860 |
Animated movie of the 'blast,' starting from where ground becomes visible again. [attachment=46270:Aligned_...st.600.2.gif] Full-res all frames here: https://imgur.com/a/Wp8swJD... had to make it pretty small, and use every other frame, to upload here as a GIF. (I did NOT think this would work. All the hard part done by those who implemented the SIFT-based stack alignment tools in ImageJ! It is quite possible there are some distortions, but I'm learning as I go.) I just can't stop looking at this movie. Outstanding compilation!!! Although the movement of the cloud relative to the surface is probably slightly exaggerated (?) by the movement of the camera and the associated change in the angle of view, you can still see the huge dynamics of the debris! And this amazing creep of shadows on the surface! It looks a bit like a version of a dust storm with large stones in it. Very unique and informative shots! I would love to see what's in the black area at the top and outside of the pictures, in the place where TAGSAM "touched" the surface. I wonder if we will see such pictures from a distance? |
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Nov 14 2020, 04:35 AM
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#48
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Member Group: Members Posts: 437 Joined: 14-December 15 Member No.: 7860 |
My rough attempt to put the post sampling picture in the context of Nightingale, including scale and orientation of the picture.
I used this Nightingale mosaic and frames 279 and 476 of the NavCam 2 TAG animation. As the shots from NavCam 2 were taken slightly obliquely to the Bennu surface, there is a shortening of the perspective compared to the mosaic and some view distortion. |
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Nov 14 2020, 04:37 AM
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#49
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Member Group: Members Posts: 437 Joined: 14-December 15 Member No.: 7860 |
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Nov 17 2020, 08:55 PM
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#50
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Member Group: Members Posts: 437 Joined: 14-December 15 Member No.: 7860 |
SamCam and NavCam 2 Imaging Footprint During TAG - now "officially" on the OSIRIS-REx website
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Nov 18 2020, 09:36 PM
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#51
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Member Group: Members Posts: 437 Joined: 14-December 15 Member No.: 7860 |
I added my own interpretation of the TAGSAM head touch point location to my previously posted OSIRIS-REx photo compilations (based on newly released Imaging Footprint During TAG)
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Jan 19 2021, 08:19 PM
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#52
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Member Group: Members Posts: 437 Joined: 14-December 15 Member No.: 7860 |
Considerations on the extended OSIRIS-REx mission to Apophis:
https://www.space.com/osiris-rex-asteroid-p...it-apophis-2029 : „...scientists behind NASA's OSIRIS-REx asteroid sample-return mission are contemplating sending the spacecraft to study a second asteroid in 2029, this time the infamous Apophis. If that appointment comes to be, the spacecraft will arrive at Apophis in April 2029... The OSIRIS-REx team plans to propose an extended mission to NASA in the summer of 2022, Lauretta said. Visiting Apophis is one option for what that extended mission could look like, but so far, it's the only target that engineers have found the spacecraft could visit long-term...” |
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Jan 19 2021, 08:46 PM
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#53
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Senior Member Group: Members Posts: 1592 Joined: 14-October 05 From: Vermont Member No.: 530 |
*Orbit* Apophis. Wow.
The duration post-sample return is similar to Hayabusa2 XM's discussed starting here: http://www.unmannedspaceflight.com/index.p...st&p=247738 ... so I wonder if it's all Earth flybys, or if Venus is also in the mix. |
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Jan 19 2021, 11:01 PM
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#54
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Member Group: Members Posts: 715 Joined: 22-April 05 Member No.: 351 |
*Orbit* Apophis. Wow. They could even poke the surface with the sampling arm to test its strength (presumably after all other studies are complete). -------------------- |
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Jan 20 2021, 03:19 AM
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#55
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
I've read about some other proposals for Apophis missions, arriving before the Earth encounter and escorting it to watch for changes both on the surface and from nearby (the views at closest approach would be spectacular, too!). But a spacecraft already launched has so many advantages.
Crossing fingers for approval! It's interesting that they could find no other close encounters in the next 8 years but Apophis. Something about the orbital mechanics being special? |
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Jan 20 2021, 03:28 AM
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#56
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
2021: Everyone's hoping that Osiris-Rex will have an Apophis encounter in 2029.
2004: Everyone's hoping that Earth won't have an Apophis encounter in 2029. |
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Jan 20 2021, 04:12 PM
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#57
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Member Group: Members Posts: 715 Joined: 22-April 05 Member No.: 351 |
I've read about some other proposals for Apophis missions, arriving before the Earth encounter and escorting it to watch for changes both on the surface and from nearby (the views at closest approach would be spectacular, too!). But a spacecraft already launched has so many advantages. Crossing fingers for approval! It's interesting that they could find no other close encounters in the next 8 years but Apophis. Something about the orbital mechanics being special? There would be value in closeup imaging of Apophis before its close encounter so that OSIRIS-REx can look for changes caused by the close encounter with Earth, potentially with a cubesat spacecraft. Also, OSIRIS-REx lacks some standard remote sensing composition instruments such as a gamma-ray spectrometer. (No need for those instruments with sample being returned to Earth.) There was a conference last year about Apophis and possible missions (including the potential OSIRIS-REx rendevous linked above). See Session 5 for the mission concepts. Conference abstracts -------------------- |
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Jan 21 2021, 12:35 AM
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#58
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Yes, those are what I read, thanks for finding it! With only eight years until the encounter, the time to start solidifying any proposals is coming up.
This thread is only about O-REx though, so I won't go into those..... |
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Jan 21 2021, 07:48 PM
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#59
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Member Group: Members Posts: 437 Joined: 14-December 15 Member No.: 7860 |
It's interesting that they could find no other close encounters in the next 8 years but Apophis. Something about the orbital mechanics being special? I guess the author meant (long-term) orbiting an asteroid, not just a close encounter. This probably significantly narrows the possibilities. [with reduced amount of fuel, only a relatively small difference in orbital velocity between the asteroid and the spacecraft is required...] |
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Jan 27 2021, 04:09 PM
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#60
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
A final Bennu flyby is planned for April to check out the sampling site (not confirmed, but "if feasible")! 3.2 km closest approach, and also an opportunity to check the instruments are working well and not too affected by dust kicked up during the TAG.
https://www.asteroidmission.org/?latest-new...eroid-departure |
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