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Post-Sampling & Earth Return
Guillermo Abrams...
post Nov 4 2020, 12:23 PM
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QUOTE (Greenish @ Nov 1 2020, 01:46 AM) *
Animated movie of the 'blast,' starting from where ground becomes visible again.


Oh, this is the one that convinced me. Thanks!
Guillermo


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Leés español? Visitá mi blog!
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Marcin600
post Nov 4 2020, 05:12 PM
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QUOTE (Greenish @ Nov 1 2020, 05:46 AM) *
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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Marcin600
post Nov 14 2020, 04:35 AM
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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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Marcin600
post Nov 14 2020, 04:37 AM
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And also an attempt to superimpose a post sampling picture on the Nightingale mosaic
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Marcin600
post Nov 17 2020, 08:55 PM
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SamCam and NavCam 2 Imaging Footprint During TAG - now "officially" on the OSIRIS-REx website
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Marcin600
post Nov 18 2020, 09:36 PM
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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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Marcin600
post Jan 19 2021, 08:19 PM
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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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stevesliva
post Jan 19 2021, 08:46 PM
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*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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vjkane
post Jan 19 2021, 11:01 PM
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QUOTE (stevesliva @ Jan 19 2021, 12:46 PM) *
*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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Explorer1
post Jan 20 2021, 03:19 AM
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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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JRehling
post Jan 20 2021, 03:28 AM
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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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vjkane
post Jan 20 2021, 04:12 PM
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QUOTE (Explorer1 @ Jan 19 2021, 07:19 PM) *
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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Explorer1
post Jan 21 2021, 12:35 AM
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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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Marcin600
post Jan 21 2021, 07:48 PM
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QUOTE (Explorer1 @ Jan 20 2021, 04:19 AM) *
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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Explorer1
post Jan 27 2021, 04:09 PM
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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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