IPB
X   Site Message
(Message will auto close in 2 seconds)

Welcome Guest ( Log In | Register )

102 Pages V  « < 7 8 9 10 11 > » 

mcaplinger
Posted on: Jan 29 2023, 10:18 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (Gerald @ Jan 29 2023, 10:27 AM) *
Could you please release at least one of the invalid raw images, if they aren't completely saturated by noise?

Everyone should stop assuming that somehow this is a choice I can make, it's above my pay grade.

If the images showed anything useful in terms of scene content, we would have pushed harder to get them released.
  Forum: Juno · Post Preview: #259676 · Replies: 27 · Views: 9666

mcaplinger
Posted on: Jan 29 2023, 03:54 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


To correct some misimpressions I have heard in various channels:

The Junocam instrument paper says that
QUOTE
A platinum resistance thermometer (PRT) on the camera focal plane is read by the spacecraft to
provide temperature knowledge for radiometric calibration.

Since PDS release 8, the focal plane temperature is given in the metadata for each image. It is not correct (always says 0C) in earlier releases and in the missionjuno metadata for regrettable but unintentional software bookkeeping reasons.

I wish I could describe our ongoing diagnostic efforts in more detail, but I can't for various reasons that those of us who have worked on these missions are all too aware of.
  Forum: Juno · Post Preview: #259668 · Replies: 27 · Views: 9666

mcaplinger
Posted on: Jan 28 2023, 04:48 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


https://www.nasa.gov/feature/jpl/nasa-s-jun...lyby-of-jupiter

QUOTE
The JunoCam imager aboard NASA’s Juno spacecraft did not acquire all planned images during the orbiter’s most recent flyby of Jupiter on Jan. 22. Data received from the spacecraft indicates that the camera experienced an issue similar to one that occurred on its previous close pass of the gas giant last month, when the team saw an anomalous temperature rise after the camera was powered on in preparation for the flyby.

However, on this new occasion the issue persisted for a longer period of time (23 hours compared to 36 minutes during the December close pass), leaving the first 214 JunoCam images planned for the flyby unusable. As with the previous occurrence, once the anomaly that caused the temperature rise cleared, the camera returned to normal operation and the remaining 44 images were of good quality and usable.


The good images have been posted to missionjuno.
  Forum: Juno · Post Preview: #259660 · Replies: 27 · Views: 9666

mcaplinger
Posted on: Jan 20 2023, 07:04 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (vjkane @ Jan 19 2023, 04:45 PM) *
Anyone know how many more perijoves before the Io encounters next year?

The close Io approaches are on PJ57 (2023-12-30) and PJ58 (2024-02-03).
  Forum: Juno · Post Preview: #259618 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Jan 19 2023, 09:19 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


Added to https://www.nasa.gov/feature/jpl/juno-space...lyby-of-jupiter

QUOTE
UPDATED Jan. 19, 2023: Data received from Juno indicates the first four of 90 images taken by the spacecraft’s JunoCam outreach camera during its most recent flyby of Jupiter (Perijove 47) were degraded: two were unusable and two had a high level of image noise. The JunoCam team believes the loss of these images is due to an anomalous temperature rise that occurred when the camera power was turned on in preparation for the flyby. Subsequent images – captured after the instrument returned to normal temperatures – were not degraded. The team plans to leave the instrument turned on after the next flyby, Perijove 48, rather than powering it off and then on again before Perijove 49.

JunoCam is a color, visible-light camera designed to capture pictures of Jupiter’s cloud tops. It was included on the spacecraft specifically for purposes of public engagement; although its images have been helpful to the science team, it is not considered one of the mission’s science instruments. The camera was originally designed to operate in Jupiter’s high-energy particle environment for at least seven orbits but has survived far longer. The spacecraft will make its 48th pass of the planet on Jan. 22.


I can't comment on this further except to say that this was not my suggested wording.
  Forum: Juno · Post Preview: #259615 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Jan 10 2023, 12:09 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


http://shadowcam.sese.asu.edu/images/1284

"The first ShadowCam image from orbit reveals the permanently shadowed wall and floor of Shackleton crater in never before seen detail."
  Forum: Lunar Exploration · Post Preview: #259544 · Replies: 38 · Views: 30097

mcaplinger
Posted on: Jan 5 2023, 03:14 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


A bunch of images (not all, but most) have been pushed out to missionjuno.
  Forum: Juno · Post Preview: #259493 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Dec 31 2022, 09:33 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


https://twitter.com/NASASolarSystem

Attached Image
  Forum: Juno · Post Preview: #259455 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Dec 30 2022, 07:15 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (BYEMAN @ Dec 30 2022, 10:19 AM) *
Microscope

He's looking at the photographer who's reflected in the shiny panel on the left side of the image. Looks like an old 4x5 camera like a Speed Graphic.
  Forum: Venus · Post Preview: #259444 · Replies: 7 · Views: 8463

mcaplinger
Posted on: Dec 29 2022, 11:04 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


FYI, I don't expect that any of the images will show up on missionjuno before next week. You'll note that there are no C kernels posted yet and that is a gating event. I think the holiday season has slowed everything down. Sorry for any frustration.
  Forum: Juno · Post Preview: #259436 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Dec 23 2022, 04:02 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (Brian Swift @ Dec 23 2022, 12:21 AM) *
I think a savvier approach would have been for the project to post timely updates on the problem discovery, diagnosis, and resolution.
Drama of "spacecraft in trouble" to "Can-do engineers to the rescue" could have added a few more days to Juno's periodic blip in the "news cycle".

I think you overstate the amount of drama and interest that could have been milked out of this particular event. I can't recall a relatively routine safe mode entry that was handled this way in the past. If we had been in any real jeopardy, maybe.

At any rate, nothing to do with me -- I got my hand slapped way back on Mars Observer for mentioning a safe mode entry in public and won't make that mistake again.

BTW, I am gratified by Junocam images ending up on several "best space images of 2022" lists, mostly due to the processing by the folks here and elsewhere doing their processing magic.
  Forum: Juno · Post Preview: #259389 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Dec 23 2022, 05:30 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (JohnVV @ Dec 22 2022, 06:59 PM) *
it dose not look like Io will be all that big in the junocam

It's about 80 pixels across for this pass, and definitely has some recognizable surface detail.
  Forum: Juno · Post Preview: #259382 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Dec 23 2022, 01:40 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (Bjorn Jonsson @ Dec 22 2022, 05:37 PM) *
Thanks for the update. I was actually starting to wonder if something like this had happened and recently started monitoring https://eyes.nasa.gov/dsn/dsn.html.

I've been working on a script to look for safe-mode entries using the Eyes data. You definitely would have seen some odd things had you been looking over the weekend.
  Forum: Juno · Post Preview: #259378 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Dec 23 2022, 01:30 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


https://www.missionjuno.swri.edu/news/juno-...m5gobVHSUSmh2as

QUOTE
NASA’s Juno spacecraft completed its 47th close pass of Jupiter on Dec. 14. Afterward, as the solar-powered orbiter was sending its science data to mission controllers from its onboard computer, the downlink was disrupted... Mission controllers at NASA’s Jet Propulsion Laboratory and its mission partners successfully rebooted the computer and, on Dec. 17, put the spacecraft into safe mode...
As of Dec. 22, steps to recover the flyby data yielded positive results, and the team is now downlinking the science data.

But I'm not sure when we will have enough to begin posting to missionjuno -- maybe tomorrow.
  Forum: Juno · Post Preview: #259376 · Replies: 39 · Views: 20155

mcaplinger
Posted on: Dec 18 2022, 10:59 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (BYEMAN @ Dec 18 2022, 02:04 PM) *
Isn't that for Mars missions?

It is certainly in the Mars forum. It's not like the forum organization is completely consistent, especially in regard to when a subforum is created and when it's not.

It makes more sense to me to create a new topic in lunar exploration for the LO and Ranger stuff, etc. And I was under the impression that hosting a lot of images on UMSF was being discouraged. See the discussion at http://www.unmannedspaceflight.com/index.php?showtopic=8656 although there was no definitive statement made by admins.
  Forum: Forum Guide · Post Preview: #259340 · Replies: 130 · Views: 814108

mcaplinger
Posted on: Dec 13 2022, 12:36 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (HSchirmer @ Dec 5 2022, 11:10 AM) *
Evidence of an oceanic impact and megatsunami sedimentation in Chryse Planitia, Mars

I expect that this paper will meet with a fairly skeptical response from most of the community.

Whatever happened to the "White Mars" idea that there was never any liquid water on Mars? This is the pendulum swung to the other side smile.gif
  Forum: Mars · Post Preview: #259283 · Replies: 4 · Views: 8993

mcaplinger
Posted on: Dec 7 2022, 08:55 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (Bill Harris @ Dec 7 2022, 12:09 PM) *
Have we got any sites outlining or detailing the mission or the equipment?

Not a lot of info AFAIK. https://nssdc.gsfc.nasa.gov/nmc/spacecraft/...on?id=PEREGRN-1 and https://nssdc.gsfc.nasa.gov/nmc/spacecraft/...aftId=PEREGRN-1 has a summary of the spacecraft and instruments. I presume the lander itself has some kind of camera but the payload doesn't appear to.

[edit: https://www.astrobotic.com/lunar-delivery/manifest/ has some information about non-NASA payloads. Note that it still gives Lacus Mortis as the landing site.]
  Forum: Lunar Exploration · Post Preview: #259267 · Replies: 51 · Views: 35743

mcaplinger
Posted on: Dec 1 2022, 09:53 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (Tom Tamlyn @ Dec 1 2022, 10:04 AM) *
ISTR discussions to the effect that Ingenuity's cellphone CPU is faster and more capable than the Perseverance CPU

Yes, the helicopter's Snapdragon 801 has about 16x more DRAM and 16x faster processor clock rate than the RAD750. But the helicopter's core microcontroller (TMS570LC43x) is only a little bit faster than the RAD750 and has less DRAM.

https://rotorcraft.arc.nasa.gov/Publication...AA2018_0023.pdf
https://en.wikipedia.org/wiki/RAD750
  Forum: Perseverance- Mars 2020 Rover · Post Preview: #259228 · Replies: 818 · Views: 437235

mcaplinger
Posted on: Nov 27 2022, 03:27 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (djellison @ Nov 25 2022, 03:41 PM) *
It takes plenty of creative license in doing it... - personifying the rover a LOT - but at the service of telling that emotional story accurately.

I suppose that's true. My opinion, FWIW: It's not like I was deeply involved in MER (and a tiny bit miffed that my small role in the MER-A landing didn't make the cut) but I've always felt that this degree of anthropomorphism was either something other people felt, or was being played up for the cameras. I see less of it on MSL and M2020, though perhaps I just don't run in the right circles. Perhaps the "plucky underdog" aspect of MER played into it. Guess I'm just a heartless engineer.

"How strange -- indeed, how perverse -- to weep for a machine!" - Arthur C. Clarke, GLIDE PATH, 1963
  Forum: Tech, General and Imagery · Post Preview: #259197 · Replies: 12 · Views: 15726

mcaplinger
Posted on: Nov 24 2022, 05:22 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (Brian Swift @ Nov 23 2022, 07:50 PM) *
The Andor image is a composite of pieces from multiple JunoCam images.

Thanks, Brian!

I'm curious as to how this was done; as you say only a small part of the image is from PJ20-026. I wonder if they used something like stable diffusion or if the blending was done more manually?

Nice to be a tiny part of this excellent series!
  Forum: Chit Chat · Post Preview: #259175 · Replies: 3 · Views: 5429

mcaplinger
Posted on: Nov 23 2022, 09:22 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


Is the gas giant that Narkina 5 orbits in ANDOR episode 8 a Junocam image of Jupiter? If so, does anyone recognize which one?

https://starwars.fandom.com/wiki/Narkina_5?...ina5-Andor8.png
  Forum: Chit Chat · Post Preview: #259166 · Replies: 3 · Views: 5429

mcaplinger
Posted on: Nov 22 2022, 08:22 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


QUOTE (Explorer1 @ Nov 22 2022, 11:52 AM) *
Though I'm not sure how much artistic license there is in Perseverance's mast tracking the ascent like depicted. It will be trickier than following Ingenuity's flights was!

Imaging while actually moving the RSM has never been done on M2020 as far as I know (IIRC we did test this on the ground for MSL but haven't done it on Mars.) We talked about trying to track the helicopter but the lack of exact timing knowledge simply didn't allow it (all of those shots were locked down, usually with a wide and narrow field on the two Mastcams), so I wouldn't count on it happening here either.

Might make you wonder what other seemingly cool parts of the video are just made up rolleyes.gif

BTW, isn't this "ESA" video just a JPL video with an ESA logo stuck in the corner? https://www.youtube.com/watch?v=t9G36CDLzIg
  Forum: Past and Future · Post Preview: #259156 · Replies: 579 · Views: 574531

mcaplinger
Posted on: Nov 20 2022, 04:45 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


I was involved in the data taking for Mastcam-Z but responsibility for calibration rests with a working group of the science team. There is an open literature paper on that: https://link.springer.com/article/10.1007/s11214-021-00795-x

I didn't have anything to do with Navcam.

There's supposed to be enough info in the data product SIS to answer any question one might have.
  Forum: Perseverance- Mars 2020 Rover · Post Preview: #259135 · Replies: 178 · Views: 141323

mcaplinger
Posted on: Nov 19 2022, 01:22 AM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


Janus in limbo: https://blogs.nasa.gov/janus/2022/11/18/jan...aunch-manifest/
  Forum: Cometary and Asteroid Missions · Post Preview: #259122 · Replies: 62 · Views: 130929

mcaplinger
Posted on: Nov 10 2022, 10:51 PM


Senior Member
****

Group: Members
Posts: 2559
Joined: 13-September 05
Member No.: 497


We have had some inquiries over the years about color calibration for the Mars2020 cameras. For WATSON, the best I can offer is the attached image from the calibration dataset (see https://www.researchgate.net/publication/34...ibration_Report ) This image was taken with 100 msec exposure time, 8-bit linear divide by 8 encoding, and is Bayer-interpolated but otherwise straight out of the camera. It was illuminated by a commercial halogen worklamp (Britek Halo Flood Twin 1200S) with two 500 watt bulbs with a stated color temperature of 3150K. The light source was not calibrated and the geometry was not recorded.

The target is a commercial "Macbeth ColorChecker" ( https://en.wikipedia.org/wiki/ColorChecker ) made by X-Rite and purchased sometime around 2010, I'm guessing. These charts have gone though a variety of manufacturers (they're now made by Calibrite) and I don't know how their colors may have varied; we made no attempt to measure this one.

Attached Image
  Forum: Perseverance- Mars 2020 Rover · Post Preview: #259077 · Replies: 178 · Views: 141323

102 Pages V  « < 7 8 9 10 11 > » 

New Posts  New Replies
No New Posts  No New Replies
Hot topic  Hot Topic (New)
No new  Hot Topic (No New)
Poll  Poll (New)
No new votes  Poll (No New)
Closed  Locked Topic
Moved  Moved Topic
 

RSS Lo-Fi Version Time is now: 17th December 2024 - 04:10 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.