My Assistant
| Posted on: Jun 28 2016, 02:16 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: Juno · Post Preview: #231386 · Replies: 183 · Views: 181452 |
| Posted on: Jun 27 2016, 05:49 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
We didn't take any RGB images of stars and the zodiacal light. We took some red and some green with spectral crosstalk because the amount of TDI was longer than the frame height would support. As for processing the IMG files, there's a saying about giving a man a fish, I don't quite recall how it goes. |
| Forum: Juno · Post Preview: #231374 · Replies: 183 · Views: 181452 |
| Posted on: Jun 22 2016, 06:15 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
One nearly always uses ET, not UT1. I just call NAIF utc2et and let it worry about the details. |
| Forum: Image Processing Techniques · Post Preview: #231321 · Replies: 3 · Views: 7423 |
| Posted on: Jun 21 2016, 08:08 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I wonder if there is a reason for the greenish cast with these images... If these are from the EDRs, then it's because there is no color correction in the camera and it just worked out this way between the filter bandpasses and the sqroot encoding. If they were from the RDRs with the band scaling applied, it's because the scaling is slightly off, which would not surprise me. For the EFB images, since the Earth's clouds are basically white, an auto white balance works fine, though a color purist might object. |
| Forum: Juno · Post Preview: #231312 · Replies: 597 · Views: 607347 |
| Posted on: Jun 20 2016, 07:54 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
@M.Caplinger: Thanks for reprocessing the PDS files! I have updated six of the EFB images at http://www.msss.com/junocam_efb/pds/ that were decompressed incorrectly. These are 00C096, 00C098, 00C100, 00M095, 00M099, and 00M103. The rest of the EFB dataset should have been correct. These are not official products, have undergone no QC or review, I'm not promising the label information is even as accurate as it was the last time, etc. But the image data itself should be better. |
| Forum: Juno · Post Preview: #231299 · Replies: 597 · Views: 607347 |
| Posted on: Jun 20 2016, 03:37 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
Provided I'll get access to the reprocessed EFBs in time, and everything works as I'm expecting, is there any interest to include such an animation over several EFBs into the press briefing(s) on the 30th? If so, which movie format (mpeg4 or avi), resolution, time-lapse rate, and real-world time interval would be preferred? I have no idea, I'm not even sure at this point who's participating in the outreach press briefing or what it will cover. I'd think that EFB images might have a certain potential for media confusion ("if we're arriving at Jupiter what are these images of the Earth?") That said, I've been told that the preferred video product in general is a 1280x720 pixel 59.94 fps Quicktime ProRes HQ codec Quicktime movie. |
| Forum: Juno · Post Preview: #231292 · Replies: 597 · Views: 607347 |
| Posted on: Jun 19 2016, 03:41 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
Emily I was a little confused about approach data, is that data also being kept on Juno until the august playback? This is the wrong thread for this discussion. From Emily's writeup http://www.planetary.org/blogs/emily-lakda...om-junocam.html : QUOTE The Juno team plans to wait for the complete downlink of all of the Approach Movie frames before releasing the images, so don't bother to start looking for [them] until the day of orbit insertion. |
| Forum: Juno · Post Preview: #231277 · Replies: 597 · Views: 607347 |
| Posted on: Jun 19 2016, 12:07 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I know at least, that some members of the Jupiter community are hoping for processed Jupiter images, as immediate after downlink as possible. I have every expectation that our standard-processed map-projected products will be available as soon as we have reconstructed spacecraft attitude information, 2-3 days after each perijove. Assuming of course that the perijove pass is nominal and the data are downlinked without gaps, etc. As with EFB, it may be that amateur-processed products that are more manual and labor-intensive will be better than our automatically-generated ones. BTW, when the missionjuno website says they are posting the "raw data" I am not at this point 100% certain what they mean. That said, I'm sure that the raw data will be available somewhere. |
| Forum: Juno · Post Preview: #231275 · Replies: 597 · Views: 607347 |
| Posted on: Jun 18 2016, 08:05 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I'll see, whether I can repair the PDS versions of EFBs 5 to 10. Don't waste your time with this. The fix has been known for some time and all I need to do is rerun the processing for these products; I'll try to get that done next week. I'd have done it before but honestly I think you are the only person in the world who has ever looked at these files. |
| Forum: Juno · Post Preview: #231271 · Replies: 597 · Views: 607347 |
| Posted on: Jun 16 2016, 01:35 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
"Notional" means they haven't decided yet. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #231237 · Replies: 43 · Views: 137920 |
| Posted on: Jun 16 2016, 05:01 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: Perseverance- Mars 2020 Rover · Post Preview: #231228 · Replies: 43 · Views: 137920 |
| Posted on: Jun 16 2016, 04:16 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
Do you have a published, verified reference for this information, Stratespace? http://ippw2016.jhuapl.edu/docs/abstracts/...rumentation.pdf page 18 has the system description but not the specific details. I wasn't at this conference but it seems unlikely that someone would just make this stuff up. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #231225 · Replies: 43 · Views: 137920 |
| Posted on: Jun 8 2016, 10:35 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: MSL · Post Preview: #231164 · Replies: 1206 · Views: 885304 |
| Posted on: Jun 8 2016, 09:24 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
The reworked cover contains a single white line in place of the fiducial marker on the anodised cover, does that line perform a similar role to the earlier markers? I don't see what you're talking about. As far as I know all of these targets were used for arm checkout and don't have any ongoing operational role, but I could be mistaken. |
| Forum: MSL · Post Preview: #231162 · Replies: 1206 · Views: 885304 |
| Posted on: Jun 8 2016, 08:32 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
...sticker residue and aluminum that was re-anodized on earth. Same end result, you can see the pattern where something protected the surface. To be clear, I don't think there was ever adhesive of any kind. I think the original white pattern was some kind of paint/marking ink (probably epoxy-based, that's what we use for labeling) that was stripped off when the cover was re-anodized. |
| Forum: MSL · Post Preview: #231160 · Replies: 1206 · Views: 885304 |
| Posted on: Jun 8 2016, 03:54 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I would have thought the pattern would be printed on some sort of backing surface with then a uniform adhesive on the back... If you look at the original M34 raw images taken in the system thermal test (sorry, can't share), you can see that the background color is identical to the cover's, so there is no backing surface as far as I can tell at the resolution of the image. It looks like a cut decal, very conformal to the cover. I don't know more about the story of this target, but I have some inquiries in. [EDIT] Ah, the full story. The covers were originally black-anodized but were found to be flaking ( http://llis.nasa.gov/lesson/8403 .) Seems like the original white target got stripped off when the covers were reanodized but there was some residual etching and that's what you're seeing. |
| Forum: MSL · Post Preview: #231151 · Replies: 1206 · Views: 885304 |
| Posted on: Jun 2 2016, 06:03 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
As I recall, the NH camera pixels are around 1 arc second in size (smallest yet flown beyond LEO), would the Plutonian system gravitational deflection of NH be superimposed on the barycenter curve as shown, and therefore visible as a slight 'deformation' of the curve, or is the deflection small enough it can only be discerned through the radio science experiment ?? http://www.unmannedspaceflight.com/index.php?showtopic=5079 If the deflection angle is about 2 arc-min per that thread (assuming I haven't made a units conversion mistake), then that would be about 100 LORRI pixels, so yeah, it should be in there somewhere, though there would be some motion of Pluto against the star background even if there was no deflection and even without the barycenter thing. BTW, MOC and HiRISE have smaller IFOVs than LORRI, so your "smallest yet flown beyond LEO" is wrong. |
| Forum: New Horizons · Post Preview: #231071 · Replies: 121 · Views: 3887049 |
| Posted on: May 29 2016, 11:46 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: Past and Future · Post Preview: #231004 · Replies: 130 · Views: 266058 |
| Posted on: May 29 2016, 07:04 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: Private Missions · Post Preview: #230985 · Replies: 240 · Views: 2300169 |
| Posted on: May 29 2016, 07:00 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
So, does Curiosity record vibrational data while drilling the holes? I don't think so. It's a percussive drill being driven open-loop, so there's only very coarse telemetry. See http://www.esmats.eu/amspapers/pastpapers/pdfs/2010/okon.pdf |
| Forum: MSL · Post Preview: #230984 · Replies: 368 · Views: 290050 |
| Posted on: May 23 2016, 09:30 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I hoped that it might explain how the other MSSS cameras' flat files were processed, but it doesn't; it only covers MAHLI. All of the MSSS cameras are electrically identical from the detector back and all of the ground calibration was done in basically the same way, so it's a safe assumption that the processing was as similar as it could have been. Mods: you might consider moving this part of the discussion to the MSL cameras thread, as the intent of this thread was "hypothetical near-future rovers". |
| Forum: Image Processing Techniques · Post Preview: #230913 · Replies: 12 · Views: 13968 |
| Posted on: May 23 2016, 04:52 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
for future missions, it would be nice to have the raw data that was used to produce the flat IMGs and some explanation of the processing that was done to produce it. Have you read all of https://www.researchgate.net/publication/27...ibration_status including the supplemental data file? Maybe I should start a thread about my dream list of what I want from the amateur community. |
| Forum: Image Processing Techniques · Post Preview: #230901 · Replies: 12 · Views: 13968 |
| Posted on: May 20 2016, 10:31 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
One thing I've been particularly unclear about is shutter correction... Can be done for the engineering cameras, does not exist for Mastcam/MAHLI/MARDI because the amount of smear is vastly smaller with their interline sensors than for the frame transfer sensors of the engineering cameras. From the MSL camera SIS http://pds-imaging.jpl.nasa.gov/data/msl/M..._SIS_latest.PDF : QUOTE Keyword SHUTTER_CORRECTION_MODE_ID Specifies whether shutter subtraction will be performed. • Eng. Cameras 0 = “NONE” 1 = “CONDITIONAL” 2 = “ALWAYS” • MMM Cameras “N/A” |
| Forum: Image Processing Techniques · Post Preview: #230870 · Replies: 12 · Views: 13968 |
| Posted on: May 2 2016, 02:24 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
In case anyone is still reading this fairly arcane discussion: per http://www.lpi.usra.edu/opag/jul2013/prese...o_efb_plans.pdf slide 24 there was no DSN tracking from 2.25 hours before to 1.5 hours after periapsis (as I should have realized, considering no DSN stations in view) and while ESA was tracking during most of that gap, I don't know if the ESA tracking data ever made it into the orbit determination. I would still find errors of more than 5 km or so, at most, quite implausible. Since most of the features in the mismatch area are clouds, I have wondered if this is uncorrected stereo parallax from the cloud height. But Gerald's match seems good enough that I wonder about that explanation; I haven't tried to work out the numbers. The altitude in this image was still about 3000 km. |
| Forum: Juno · Post Preview: #230669 · Replies: 597 · Views: 607347 |
| Posted on: May 1 2016, 09:39 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
That's true, the discrepancy is more than 100 km (edit: I think, it's SPICE data to be adjusted about 400 km, mainly to the north)... But my analysis is yet too superficial to rule out cumulated effects by Earth's oblateness, some inaccuracy of the optical axis, light travel time, and some delay between nominal image time and effective exposure time. As a rough check on the possible level of error in the spacecraft position, I compared the predicted position at the start time of EFB12 between spk_pre_130502_131130_130924_jc030.bsp (the last predict file before EFB) and spk_rec_131005_131014_131101.bsp (the reconstructed trajectory of EFB as known on 1 Nov 2013.) The delta position was 1.3 km, and that fits my recollection -- I was hoping that the mismatch artifacts would improve once we had the reconstruction, but they didn't. What I don't know is how well the spacecraft was being tracked during EFB. The main observable is range and range rate as derived from precisely measuring the round-trip time between the DSN station and the spacecraft (see http://descanso.jpl.nasa.gov/monograph/ser...scanso1_C03.pdf ) but recall that Juno went into safe mode shortly after periapsis during EFB, and that would almost certainly have disrupted the tracking. All that said, I'd still be very surprised by errors as large as what you are seeing, unless there is some out-and-out bug in the SPICE file production process. As to those other error sources, I am certainly not claiming infallibility, but all of those have always been accounted for by our processing. The effective exposure time offset is certainly present, but my best estimate of that offset is about 81.88 milliseconds -- which doesn't explain the mismatch. (Note that the velocity at EFB12 was about 14 km/sec so a 0.1 second time error translates to a position error of something like 1.4 km.) |
| Forum: Juno · Post Preview: #230667 · Replies: 597 · Views: 607347 |
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