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mcaplinger
Posted on: Aug 20 2022, 07:01 PM


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QUOTE (Kevin Gill @ Aug 20 2022, 10:48 AM) *
It's hard to tell, but it looks like the GRS was partly visible hitting the evening terminator during the first approach images (JNCE_2022229_44C00029_V01, down at the bottom limb).

Possible, we took a lot more approach imaging this time than my earlier analysis considered.
  Forum: Juno · Post Preview: #258137 · Replies: 23 · Views: 14315

mcaplinger
Posted on: Aug 19 2022, 01:42 PM


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OT but given Masten's recent bankruptcy I'm surprised to see them still listed.
  Forum: Lunar Exploration · Post Preview: #258121 · Replies: 156 · Views: 88200

mcaplinger
Posted on: Aug 17 2022, 05:16 PM


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QUOTE (bobik @ Aug 16 2022, 11:30 PM) *
Wasn't this issue addressed in the recent media briefing?

I don't have an hour to kill listening, but it was certainly mentioned. Sorry, I don't have the time to clean up the transcript very much either.

QUOTE
question comes from kenneth king with new york times your line is now open
How is this going to affect perseverance um
mission and where would the notional landing spot be? would it be outside the crater because that's where percy would be heading to
or would would you double back...

the basic plan for for perseverance is to continue to do the jezero delta
campaign that they're in right now and acquire a set of samples over the next few months which will likely be put into a first depot on the surface sometime later this year
as as a sort of insurance policy you might say and then after that
drive up through the rest of the jezero delta and then
eventually leave the crater and go on to the midway site which is some of the more ancient terrain on mars and
and in that case it would continue to acquire samples through that whole time frame and so in
fact we could land srl out wherever
perseverance ends up and the intent is that it not come back to jezero in
that case.

i think the main idea is that
we don't really we haven't actually changed anything about planning for where the samples depot so the
first depot is most likely is going to be in a few months time within jezero crater as an
insurance policy and then we'll carry the rest of the samples and i mean perseverance has
been collecting duplicate samples which means that there'll be a set of rock
cores on board that will be duplicates of the ones that are going to be deposited within jezero and we'll carry
those out with it towards midway and continue collecting.


That said, I could easily imagine that conservatism of various sorts could end up killing an extended mission traverse to Midway. Frankly, I'll be very happy if we get samples back from Jezero without the extended mission stuff, which was far from guaranteed even in the original MSR baseline.
  Forum: Past and Future · Post Preview: #258108 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Aug 16 2022, 02:40 PM


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QUOTE (vjkane @ Aug 16 2022, 05:55 AM) *
...deep roots in the Mars science community and likely knows much that isn't public.

What does the "science community" know about it? smile.gif

Seriously, it's pretty obvious that there will be some impact to the extended mission. People who advocated for tentative plans to leave Jezero are likely to be more vocal about that than others.
  Forum: Past and Future · Post Preview: #258095 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Aug 16 2022, 12:12 AM


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QUOTE (vjkane @ Aug 15 2022, 03:29 PM) *
Space.com has an article where a leading Mars researcher, Jack Mustard, says that the new plan to have Perseverance deliver the collected samples to the sample return lander will mean that it can't leave Jezero Crater to continue the long expected extended mission to explore Nili Planum (the Midway site)...

It's pretty obvious that the new plan requires M2020 to deliver samples to the SRL. I don't think the landing site for the SRL has been decided yet, though, so complaining would seem to be premature. Nothing is forcing the landing site to be inside Jezero as far as I know.
  Forum: Past and Future · Post Preview: #258091 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Aug 5 2022, 07:54 PM


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QUOTE (Brian Swift @ Aug 4 2022, 11:47 PM) *
...predicting visibility of GRS is above my pay grade.

If you know the System III longitude of the GRS at a given time, its canonical SIII drift rate is +0.308 degrees/day.

A quick skim of the amateur images on missionjuno shows that the GRS was at about 300 degrees system III on 7/24/2022.

So I think the GRS will not be visible on the outbound leg of this month's PJ, which covers 130W to 200W, about.

If I did all that right.
  Forum: Juno · Post Preview: #257973 · Replies: 37 · Views: 26519

mcaplinger
Posted on: Jul 29 2022, 12:10 AM


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More info about the ERO in "Mars Sample Return - Earth Return Orbiter: ESA’s next Interplanetary Electric Propulsion Mission Concept" http://electricrocket.org/2019/927.pdf

Dated 2019 but should be fairly accurate. Let us hope they avoid the problems of the last solar-electric mission I worked on sad.gif
  Forum: Past and Future · Post Preview: #257910 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 27 2022, 05:26 PM


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Nice paper, thanks. Looks to me like this arrangement could in theory pick a sample up off the ground (see "Figure 9. Body-Grip Grasp"), though I could imagine they would want to avoid this for many reasons.
  Forum: Past and Future · Post Preview: #257892 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 27 2022, 05:02 PM


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QUOTE (Explorer1 @ Jul 27 2022, 09:44 AM) *
Judging from the (admittedly low-quality) image in the release, the end does not exactly look like it has 'fingers'. I expect that we will have more details to come in the coming months, with further reviews...

As far as I can tell from "Mars 2020 Rover Adaptive Caching Assembly: Caching Martian Samples for Potential Earth Return" https://trs.jpl.nasa.gov/bitstream/handle/2...252320-1515.pdf all the rover can do is drop a sample out of the caching system. Maybe the ESA arm can grapple it or catch it before it hits the surface?
  Forum: Past and Future · Post Preview: #257890 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 27 2022, 04:19 PM


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QUOTE (Explorer1 @ Jul 27 2022, 08:05 AM) *
Looks like the arm will directly retrieve them from Perseverance, somehow.

Rover just rolls up to the front of the lander in reach of the arm and barfs the samples out of the caching system onto the ground where they can be picked up, would be my guess. Unless there is some better mode that the caching system supports, I'm too lazy to find the as-flown description of the system right now and don't recall for sure.
  Forum: Past and Future · Post Preview: #257887 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 27 2022, 03:38 PM


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Kind of an odd statement in the press release:

QUOTE
This refined concept for the Mars Sample Return campaign was presented to the delegates from the 22 participating states of Europe’s space exploration program, Terrae Novae, in May. At their next meeting in September, the states will consider the discontinuation of the development of the Sample Fetch Rover.


Not sure what "consider" means in this context. smile.gif
  Forum: Past and Future · Post Preview: #257885 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 26 2022, 11:54 PM


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BTW, in case this has occurred to anyone -- Shadowcam is not sensitive enough to see by Earthlight, but it's too sensitive to image anything illuminated by the Sun without saturating. So it can really only image shadowed regions slightly illuminated by surrounding lit topography. We tried to make it as insensitive to stray light as we could, but mixes of shadow and sunlight may cause problems -- we'll just have to see.
  Forum: Lunar Exploration · Post Preview: #257879 · Replies: 38 · Views: 30101

mcaplinger
Posted on: Jul 26 2022, 10:10 PM


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QUOTE (Phil Stooke @ Jul 26 2022, 02:03 PM) *
I look forward to seeing the images.

As do we! Keep in mind that while the launch is just a week away, it takes KPLO quite a while to get to the Moon; mapping won't start until sometime in December, I think. See https://directory.eoportal.org/web/eoportal...missions/k/kplo
  Forum: Lunar Exploration · Post Preview: #257878 · Replies: 38 · Views: 30101

mcaplinger
Posted on: Jul 26 2022, 09:31 PM


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QUOTE (Phil Stooke @ Jul 26 2022, 01:19 PM) *
I think I have seen it is 200 times more sensitive that NAC.

Something like that; larger pixels (12 micron instead of 7), 32 TDI stages, and a higher QE sensor. It was a big pain to test compared to NAC because we had to use strong ND filters to image any normal scene. More info at http://shadowcam.sese.asu.edu/
  Forum: Lunar Exploration · Post Preview: #257874 · Replies: 38 · Views: 30101

mcaplinger
Posted on: Jul 21 2022, 11:07 PM


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QUOTE (stevesliva @ Jul 21 2022, 02:55 PM) *
I thought it was implied that they'll somewhat bank on Perseverance itself as the backup...

Perhaps they will grit their teeth and do this, though M2020 will be way outside the warranty then. But I find it hard to believe that the near-total lack of standard mission assurance stuff (all the parts in Ingenuity were COTS, no rad-hard anything, no MIL-STD-883 anything, as far as I know) will pass muster here. But I could be wrong, we'll see.
  Forum: Past and Future · Post Preview: #257822 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 21 2022, 09:51 PM


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QUOTE
NASA will host a media teleconference at 11 a.m. EDT (8 a.m. PDT) on Wednesday, July 27, to discuss the architecture for its Mars Sample Return campaign.

NASA and the ESA (European Space Agency) recently held a systems requirement review as part of the Mars Sample Return campaign’s conceptual design phase – a phase when the architecture is refined and solidified. The briefing will present the architecture proposal that is expected to be finalized in September 2022.

https://mars.nasa.gov/news/9229/nasa-esa-to...return-mission/
  Forum: Past and Future · Post Preview: #257817 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 21 2022, 02:30 PM


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QUOTE (rlorenz @ Jul 21 2022, 05:17 AM) *
I think the concept is viable...

I just hope the engineers are not being overly optimistic. "Just adding an arm and some wheels" sounds like it could easily morph into a mass of ripple effects, and MSR is not on such firm footing at this point that it can afford a lengthy diversion.

And the heli team may find being mission-critical instead of a technology demonstrator not to their liking (ask me how I know.)
  Forum: Past and Future · Post Preview: #257812 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Jul 19 2022, 02:48 PM


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According to the tweets, ESA was going to announce a path forward for Exomars with NASA participation, and that briefing has been delayed. I wasn't able to find any reporting on this other than Twitter, though, so I would view this all with some skepticism.
  Forum: ExoMars Program · Post Preview: #257795 · Replies: 589 · Views: 581352

mcaplinger
Posted on: Jul 19 2022, 06:26 AM


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VIPER now delayed until November 2024 https://www.nasa.gov/feature/nasa-replans-c...-to-reduce-risk

QUOTE
To complete the additional NASA-mandated tests of the Griffin lunar lander, an additional $67.8 million has been added to Astrobotic’s CLPS contract, which now totals $320.4 million.

  Forum: Lunar Exploration · Post Preview: #257791 · Replies: 14 · Views: 60130

mcaplinger
Posted on: Jul 12 2022, 01:19 AM


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https://archive.stsci.edu/prepds/relics/col...acs0723-73.html has some HST images to compare with this one (found by user leovinus over at NSF.)
https://forum.nasaspaceflight.com/index.php?topic=54269.960
  Forum: Telescopic Observations · Post Preview: #257712 · Replies: 297 · Views: 418891

mcaplinger
Posted on: Jul 10 2022, 09:51 PM


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QUOTE (scalbers @ Jul 10 2022, 01:45 PM) *
Yes indeed it is a gap, though I wonder about the bowling pin shaped feature within.

Isn't it just a rock on top of another rock?
  Forum: Perseverance- Mars 2020 Rover · Post Preview: #257693 · Replies: 1109 · Views: 421902

mcaplinger
Posted on: Jun 30 2022, 03:57 PM


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I sometimes access the forum on an Android tablet using Firefox. Starting a few months ago, going to the main page seems to autorefresh constantly, so the only way to use the site is to manually stop the reload and refresh as needed until a valid page is displayed. This doesn't happen if you tell Firefox to use the desktop version of the site.

Unfortunately Android Firefox has been so dumbed-down that I can't look at the page source, so my ability to diagnose this is limited.

This could easily be a Firefox problem but I haven't seen it on any other site.
  Forum: Forum Maintenance · Post Preview: #257616 · Replies: 36 · Views: 239827

mcaplinger
Posted on: Jun 24 2022, 06:26 PM


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https://www.nasa.gov/press-release/nasa-ann...steroid-mission

QUOTE
NASA announced Friday the Psyche asteroid mission, the agency’s first mission designed to study a metal-rich asteroid, will not make its planned 2022 launch attempt.

Due to the late delivery of the spacecraft’s flight software and testing equipment, NASA does not have sufficient time to complete the testing needed ahead of its remaining launch period this year, which ends on Oct. 11. The mission team needs more time to ensure that the software will function properly in flight...

“NASA takes the cost and schedule commitments of its projects and programs very seriously,” said Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate in Washington. “We are exploring options for the mission in the context of the Discovery Program, and a decision on the path forward will be made in the coming months.”

  Forum: Cometary and Asteroid Missions · Post Preview: #257570 · Replies: 62 · Views: 130935

mcaplinger
Posted on: Jun 24 2022, 06:08 PM


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QUOTE (Bjorn Jonsson @ Jun 6 2022, 10:16 AM) *
... it would be a very interesting and good idea to take at least one test image with lossless compression over the highly photogenic area near latitude ~40 deg north.

FWIW, I raised the possibility of doing this in today's PJ43 planning telecon, but we can't do it for PJ43 because of data volume constraints from Io imaging. We will certainly consider it for PJ44.
  Forum: Juno · Post Preview: #257569 · Replies: 20 · Views: 14047

mcaplinger
Posted on: Jun 4 2022, 05:17 PM


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QUOTE (Explorer1 @ Jun 4 2022, 08:54 AM) *
Though we are only speculating on why it was hush-hush for so long.

FWIW this was mentioned in the MEPAG report from about a month ago. https://www.lpi.usra.edu/mepag/meetings/mep...anson_Meyer.pdf slide 6.
  Forum: MAVEN · Post Preview: #257390 · Replies: 27 · Views: 95232

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