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mcaplinger
Posted on: Nov 29 2023, 09:24 PM


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Some of the images have been posted on missionjuno.

You will immediately notice that there is something weird about them. Yes, we know about this, and I'll say more about it when I can. In the meantime, anything people can do to process them would be appreciated. I've had some success using https://github.com/chunglabmit/pystripe
  Forum: Juno · Post Preview: #262188 · Replies: 42 · Views: 23366

mcaplinger
Posted on: Nov 17 2023, 02:47 AM


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QUOTE (tanjent @ Nov 16 2023, 05:29 PM) *
wait for a privately sponsored mission to bring the samples back...

Despite all the hype from some quarters, you might have a long wait.
  Forum: Past and Future · Post Preview: #262151 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 17 2023, 02:45 AM


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QUOTE (StargazeInWonder @ Nov 16 2023, 05:27 PM) *
"Down to" and "up" don't apply with Phobos. The escape velocity is 40 km/hour. That's a nudge, not a launch.

Consider how tricky the OSIRIS-REx mission was with similar constraints, and it was just grabbing an unprepared sample.

Unless you're talking about something that would sit on Phobos, quiescent, for a decade and then launch itself up to an orbiting spacecraft. Which also sounds pretty difficult.
  Forum: Past and Future · Post Preview: #262150 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 16 2023, 07:56 PM


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QUOTE (StargazeInWonder @ Nov 16 2023, 11:30 AM) *
Thinking (probably unhelpfully, brainstorming) outside the box, maybe a good place to store the samples would be ON Phobos. We won't lose that.

Come on. Then we have to design something that can get the samples down to Phobos, and something else that can pick them up again. I don't see how that's gonna save money, do you?

The samples are as safe as can be on Mars where they are now. The idea that they should be put into orbit and picked up later is, at best, driven by budget phasing considerations, not engineering reality.
  Forum: Past and Future · Post Preview: #262145 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 16 2023, 01:37 AM


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QUOTE (vjkane @ Nov 15 2023, 05:22 PM) *
I read this section as the review committee making a recommendation on the minimum mass and diversity of the collected samples that would make the expense worth it.

The problem is that if all of the available tubes on M2020 were returned and they were all fully loaded, it might add up to 500 grams. Look at the 10 tubes in the backup cache, which one might have plausibly thought was the performance floor. No way that adds up to 500 grams. It's barely possible it would total a quarter of that or perhaps a bit more, but more likely less.

I don't disagree that 500 grams is a plausible number to spend all this money on, but at this point it seems like unhelpful moving of the goalposts.
  Forum: Past and Future · Post Preview: #262136 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 15 2023, 12:31 AM


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QUOTE (mcaplinger @ Nov 14 2023, 12:51 PM) *
Agreed, they can't possibly mean that. If the OS has to have a long-lived beacon, then it becomes a small spacecraft and things will snowball.

Looking at the Figueroa report again, they seem to have convinced themselves that with enough tracking of the OS by assets in Mars orbit (details unspecified?), they can find it again over a 10-year period even if the beacon is dead. Which seems like a thin thread to hang the mission on to me.
  Forum: Past and Future · Post Preview: #262127 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 14 2023, 08:51 PM


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QUOTE (vjkane @ Nov 13 2023, 09:52 PM) *
A small canister in orbit could easily be lost to tracking...

Agreed, they can't possibly mean that. If the OS has to have a long-lived beacon, then it becomes a small spacecraft and things will snowball.

The Figueroa "report" (it's a viewgraph package, basically) https://www.nasa.gov/wp-content/uploads/202...nal-copy-v3.pdf has such gems as alternatives that include adding back the fetch rover (which was previously deleted to save cost) to reduce the annual cost, while driving up the total cost.

Honestly, words fail me.
  Forum: Past and Future · Post Preview: #262124 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 6 2023, 04:37 PM


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QUOTE (Explorer1 @ Nov 6 2023, 06:26 AM) *
The fact that there's no overall PI for the project, like on a normal flagship mission, also struck me (not counting Perseverance, which does have one).

Not sure what you're saying. MSL and M2020 do not have "overall PIs" nor does any flagship mission AFAIK, they have a PI per instrument and a project scientist who is not much like a PI. For example, Europa Clipper doesn't have an "overall PI". Only Discovery and New Frontiers missions do (discounting leftovers like MER and Mars Scout programs.)

The thing that's unusual about MSR is that it has no competed science instruments and thus no PIs at all, to the best of my knowledge.
  Forum: Past and Future · Post Preview: #262099 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 6 2023, 02:04 PM


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QUOTE (Explorer1 @ Nov 5 2023, 12:51 PM) *
A Planetary Society interview with the head of the independent review board. Some very interesting details.

Hmm. I'll admit that reading transcripts is always very difficult, but nothing leapt out at me that I would have called an interesting detail. What specifically are you reacting to?
  Forum: Past and Future · Post Preview: #262097 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 3 2023, 03:08 AM


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QUOTE (jasedm @ Nov 2 2023, 10:42 AM) *
The terminal tracking system seems to be more than capable of dealing with 'distractions'

One of the primary Lucy targets (617 Patroclus) is a binary so this always had to be considered. But for this flyby distance and target size I doubt it mattered much.

https://ntrs.nasa.gov/api/citations/2022000...d%20Mission.pdf for more details.
  Forum: Cometary and Asteroid Missions · Post Preview: #262072 · Replies: 118 · Views: 122259

mcaplinger
Posted on: Nov 1 2023, 06:20 PM


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Down signal on DSS14 at 232 kb/sec.
  Forum: Cometary and Asteroid Missions · Post Preview: #262051 · Replies: 118 · Views: 122259

mcaplinger
Posted on: Oct 28 2023, 12:03 AM


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Mission slipped to mid-January: https://spaceflightnow.com/2023/10/27/intui...in-mid-january/
  Forum: Lunar Exploration · Post Preview: #262031 · Replies: 156 · Views: 88170

mcaplinger
Posted on: Oct 18 2023, 09:39 PM


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QUOTE (Explorer1 @ Oct 18 2023, 01:23 PM) *
The original trajectory would have flown through the radiation belts much more often.

But it would have taken data much more frequently near Jupiter, so even though the mission has been a lot longer, the amount of science data is more or less the same. Satellite encounters notwithstanding.
  Forum: Juno · Post Preview: #261989 · Replies: 27 · Views: 13257

mcaplinger
Posted on: Sep 13 2023, 10:29 PM


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QUOTE (jasedm @ Sep 13 2023, 10:32 AM) *
It will be exciting if the terminal tracking system pans out as expected.

It will be more exciting (but not in a good way) if it doesn't. wink.gif
  Forum: Cometary and Asteroid Missions · Post Preview: #261689 · Replies: 118 · Views: 122259

mcaplinger
Posted on: Sep 6 2023, 11:34 PM


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Seeing replicas of hardware I actually worked on is always amusing. I did a little digging but couldn't figure out who constructed this one. https://buymarsrovers.com/perseverance-mars-rover-replica sells a half-scale replica but not full-scale.
  Forum: Chit Chat · Post Preview: #261637 · Replies: 1 · Views: 29962

mcaplinger
Posted on: Sep 6 2023, 09:12 PM


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QUOTE (bobik @ Sep 3 2023, 04:20 AM) *
The de-spinning mirror of JIRAM is sticking!? When did this happen?

I can neither confirm nor deny anything about this. FWIW, I amused myself for a couple of hours going through the JIRAM PDS archive to see if I could tell anything using public info. It certainly isn't something that's emphasized or even mentioned in the archive that I saw. It might be possible to figure it out by looking at the binary engineering files that have mirror state information, but I ran out of gas before getting that far.
  Forum: Juno · Post Preview: #261634 · Replies: 5 · Views: 4235

mcaplinger
Posted on: Sep 1 2023, 07:58 PM


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QUOTE (volcanopele @ Sep 1 2023, 11:55 AM) *
The bigger concern is that CAPS will do what the Decadal did and think, well, IVO was successful in Discovery so why does it need to be a NF mission...

I've read the Decadal text about this (see below) several times and I'm not really certain what they're driving at. If all they're saying is that if IVO gets picked for Discovery it shouldn't be allowed for NF, then duh.

FWIW, if I were running things, the decadal would restrict itself to listing and ranking science goals, and not have any restriction on mission selection at all. I feel like that's more like things worked in the old COMPLEX days.

From https://science.nasa.gov/science-red/s3fs-p...2%80%932032.pdf

QUOTE
Two missions on the NF-5 list of mission themes do not appear on the above lists for NF-6 and NF-7:
Io Observer and SPA sample return. The committee carefully considered the Io Observer NF theme in light
of the success of the IVO Discovery mission in reaching Phase A. In their 2020 report 19 , CAPS stated “If
NASA’s exploration of Io proceeds via the selection of the IVO Discovery mission, then based on the IVO
Step 1 proposal, inclusion of Io Observer would be redundant scientifically and its inclusion in NF5 would
strongly warrant reconsideration.” The committee reaffirms the importance of Io as unique body. Not only
is it important to understanding tidal dissipation and resulting active volcanic, tectonic, and plasma
processes, but also, for example, to providing an important analog to young terrestrial planets and tidally
heated exoplanets. The committee anticipates that Io Observer will have an opportunity to compete in NF-
5. The selection of IVO for Phase A study demonstrates that fundamental Io science can also be achieved
via the Discovery program, and this may be increasingly true with time as power systems and launch
vehicles continue to evolve. These factors placed this theme at lower priority for NF-6 and NF-7 than other
themes that clearly require a medium-class mission to complete their core science.

  Forum: Exploration Strategy · Post Preview: #261597 · Replies: 42 · Views: 194095

mcaplinger
Posted on: Aug 28 2023, 11:12 PM


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QUOTE (Zelenyikot @ Aug 28 2023, 02:59 PM) *
Different Moon rover paths.

Nicely done. Apart from minor details, my untrained eye would be hard-pressed to tell these apart.
  Forum: Lunar Exploration · Post Preview: #261545 · Replies: 220 · Views: 118074

mcaplinger
Posted on: Aug 28 2023, 08:55 PM


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QUOTE (Hungry4info @ Aug 26 2023, 10:28 AM) *
I'm guessing compression artifacts are the cause of the weird appearance of the early Chandrayaan 3 imagery.

I tried to figure out what kind of compression they might be using, or what the downlink data rate is to see if I could guess how much compression they might need to use, and came up empty. The lander doesn't appear to have a steerable antenna and DSN Now has been showing "data not available" for a while.

It would have to be a very high compression factor to produce this much artifacting, I'm wondering if might just look that way.
  Forum: Lunar Exploration · Post Preview: #261540 · Replies: 220 · Views: 118074

mcaplinger
Posted on: Aug 24 2023, 08:14 PM


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QUOTE (Hungry4info @ Aug 24 2023, 07:39 AM) *
ISRO has released the full landing video.

I have to say that the cross-fading between frames makes this extremely hard to watch IMHO. With MSL we had a low frame rate and we just displayed it with hard cuts at the actual cadence. But maybe others have different taste.
  Forum: Lunar Exploration · Post Preview: #261483 · Replies: 220 · Views: 118074

mcaplinger
Posted on: Aug 16 2023, 03:54 PM


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QUOTE (tedstryk @ Aug 15 2023, 01:33 PM) *
Also, I do not have access to enough information about the forum to determine whether or not they are overpaying.

The small amount of research I've done (which is probably old news to some of you and might just be wrong) seems to say that this forum is now locked in to using Invision, where costs range from $1K to $7K annually depending on volume ( https://invisioncommunity.com/buy ). Going to a cheaper hosting vendor would likely require porting all of the content to an open-source alternative like phpBB, which is certainly possible but will cost extra money and/or time.
  Forum: Important Announcements · Post Preview: #261356 · Replies: 47 · Views: 52776

mcaplinger
Posted on: Aug 14 2023, 05:24 AM


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QUOTE (Hungry4info @ Aug 13 2023, 06:49 PM) *
Is there any update to this effort to digitize the Surveyor imagery?

Based on https://sic.lpl.arizona.edu/collection/surveyor-digitization all of the images were scanned, but then the project seems to have stalled out before any PDS-compliant datasets were built. Last update was in 2018?
  Forum: Lunar Exploration · Post Preview: #261307 · Replies: 248 · Views: 5994578

mcaplinger
Posted on: Aug 13 2023, 03:47 PM


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https://arstechnica.com/space/2023/08/every...metal-asteroid/ has some recent pictures of the spacecraft.

The science cameras are underneath remove-before-flight covers as indicated here:

Attached Image

  Forum: Cometary and Asteroid Missions · Post Preview: #261296 · Replies: 62 · Views: 130929

mcaplinger
Posted on: Aug 11 2023, 05:29 PM


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QUOTE (nprev @ Aug 10 2023, 07:43 PM) *
We badly need a more modern, functional, accessible and sustainable platform...[/color]

I could imagine that behind-the-scenes administration of the software is a hassle, but I personally don't think it's missing any particular feature.

If "accessible" is code for increasing the number of participants, I question if that should even be a goal. One has only to look at nasaspaceflight dot com for an example of what happens when the commenting community is large; SNR suffers and knowledgeable participants leave as they are drowned out by nonsense.
  Forum: Important Announcements · Post Preview: #261271 · Replies: 47 · Views: 52776

mcaplinger
Posted on: Aug 5 2023, 06:32 PM


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QUOTE (Phil Stooke @ Aug 2 2023, 03:10 PM) *
It looks like it has some dirt - not just dust - on its solar panel.

I think those are just the antenna and diodes that have always been on the panel, seen at an oblique angle.
  Forum: Perseverance- Mars 2020 Rover · Post Preview: #261182 · Replies: 1109 · Views: 421879

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