My Assistant
| Posted on: Dec 24 2018, 08:00 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
The first batch of images has been pushed to https://www.missionjuno.swri.edu/ |
| Forum: Juno · Post Preview: #242733 · Replies: 89 · Views: 91111 |
| Posted on: Dec 16 2018, 08:50 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
598143893 is seconds after Jan 1/2000 - December 14, 2018 at 11:04 p.m. Based on the most recent clock drift file, that time maps to 2018 DEC 15 11:05:20 assuming it's really a raw SCLK value. 0 SCLK is nominally 2000-001T12:00. CODE from spice import * furnsh("naif0012.tls") furnsh("NSY_SCLKSCET.00010.tsc") t0=scs2e(-189,"598143893") print "t0", t0, et2utc(t0, "c", 0) |
| Forum: InSight · Post Preview: #242616 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 11 2018, 01:04 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #242511 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 6 2018, 08:04 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
is it correct that the nine-digit number in the image filenames is the time in seconds from 2000-Jan-01 12:00 UTC? Nominally, but the clock isn't perfect and drifts a small amount. See https://naif.jpl.nasa.gov/pub/naif/INSIGHT/...KSCET.00009.tsc And I don't know what the relationship between the time and the actual exposure time is for InSight. It takes tens of seconds to read the image out, though, so it might be off by that much at least. |
| Forum: InSight · Post Preview: #242432 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 6 2018, 02:39 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
Yeah, that bitrate ain't gonna cut it for sure. Thanks! MMO would have gotten something like a peak of 80 kbits/sec at closest Mars range using Ka-band. https://www.hou.usra.edu/meetings/smallsat2...df/20_Malin.pdf |
| Forum: Mars · Post Preview: #242415 · Replies: 10 · Views: 19971 |
| Posted on: Dec 6 2018, 01:32 AM | |
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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: #242412 · Replies: 579 · Views: 574619 |
| Posted on: Dec 5 2018, 10:45 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
12U cubesat: https://en.wikipedia.org/wiki/Mars_Micro_Orbiter wikipedia is a little out of date, mission wasn't funded for launch in 2020. |
| Forum: Mars · Post Preview: #242408 · Replies: 10 · Views: 19971 |
| Posted on: Dec 2 2018, 01:22 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
This image from the IDC camera is more obscured than from the other cameras. There are only two cameras, ICC and IDC. This is an image with the sun near the FOV. I assumed they moved the arm and this is the sky. I'm not sure if the IDC had a cover (website says there is one, but I'm not sure if that's true) or if it's been removed. https://www.hou.usra.edu/meetings/lpsc2018/pdf/2764.pdf |
| Forum: InSight · Post Preview: #242305 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 1 2018, 10:20 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
As it is, the Insight lander is heavier than Phoenix, using the same landing jets... 10 kg more landed mass from what I can tell (360 kg for InSight). From what I know of the design I don't think there's a lot more mass margin. All 12 engines at full thrust produces about 3600 newtons which is about 2.6x more than needed to hover (if I did that right), but they don't run all 12 engines at full thrust and there's the rocket equation to think of. |
| Forum: InSight · Post Preview: #242301 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 1 2018, 09:30 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I'm not sure that anyone has made any mistakes in the posts above, but there's a lot of potential confusion here. If you say that something weighs X kilograms, you really mean that it has a mass of X kilograms. I've never heard anyone in aerospace try to use some other verb than weigh in this context. Using "mass" as a verb ala Heinlein has never caught on. Units of force are a different matter and in my experience that's where the confusion comes in. |
| Forum: InSight · Post Preview: #242299 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 1 2018, 08:15 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
The dust on the ICC lens makes me wonder how dusty the Phoenix MARDI would have been had we ever managed to get a post-landing image out of it. Unfortunately there was a sequence glitch in the one attempt that was made, and PHX died before we could try again. |
| Forum: InSight · Post Preview: #242297 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 1 2018, 06:00 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #242293 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 1 2018, 03:20 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #242269 · Replies: 1270 · Views: 1002250 |
| Posted on: Nov 30 2018, 08:21 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #242254 · Replies: 1270 · Views: 1002250 |
| Posted on: Nov 30 2018, 08:04 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #242252 · Replies: 1270 · Views: 1002250 |
| Posted on: Nov 29 2018, 04:11 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
QUOTE A Mars orbiter set to image the center of the landing zone on Thursday will miss the lander, because it missed the center slightly. Missed with HiRISE. If only there was a wider-field "context camera"... |
| Forum: InSight · Post Preview: #242202 · Replies: 1270 · Views: 1002250 |
| Posted on: Nov 29 2018, 03:17 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I guess the Insight team decided to not to even include a MARDI for that or perhaps other reasons as well, so no descent images to help define the landing context. We offered a number of options, but they chose not to use any of them (of course they had a cost.) In all honesty the landing context argument isn't extremely compelling, assuming we get HiRISE images post-landing. |
| Forum: InSight · Post Preview: #242201 · Replies: 1270 · Views: 1002250 |
| Posted on: Nov 26 2018, 08:26 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #242055 · Replies: 119 · Views: 126929 |
| Posted on: Nov 24 2018, 04:41 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
How can we answer above questions without any method available to know lander tilt and wind speed and direction during landing? The tilt at landing is well-known from looking at the gravity vector and the vehicle is actively controlling its attitude during powered descent. The tilt in the last 10 seconds of parachute descent, for example, is completely irrelevant to the tilt at landing. Varying atmospheric conditions are the major reason that the landing ellipses are relatively large. |
| Forum: InSight · Post Preview: #241946 · Replies: 129 · Views: 147599 |
| Posted on: Nov 24 2018, 04:25 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
The way EDL is validated is that many Monte Carlo runs are done with all of the parameters varied across their expected ranges and we see if the landing is successful. Most of this is covered by ITAR so I wouldn't expect to see public information about the specifics. |
| Forum: InSight · Post Preview: #241945 · Replies: 129 · Views: 147599 |
| Posted on: Nov 24 2018, 03:34 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
The point is: if you are going to land on Mars (not "generic you", but you nprev or djellison), wouldn't you like to know in advance how your spaceship/spacecraft/aircraft/whatelse will be oriented during final descent? You need to calm down a little. Certainly for previous landings there have been a lot of simulations of what the attitude on chute was, and we used them to calculate exposure times, photometric angles, etc, but at best they were measures of what could have happened. Nobody expected them to look much like reality, and they didn't. For example, the MSL descent was much less oscillatory than some of the simulations. |
| Forum: InSight · Post Preview: #241942 · Replies: 129 · Views: 147599 |
| Posted on: Nov 20 2018, 04:16 AM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #241870 · Replies: 129 · Views: 147599 |
| Posted on: Nov 19 2018, 03:50 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
I'm having a hard time adding attachments over on the Insight thread. The upload seems to work but when I try to download, I just get an error message about not having permissions. |
| Forum: Forum Maintenance · Post Preview: #241857 · Replies: 36 · Views: 239827 |
| Posted on: Nov 19 2018, 03:48 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
And by the way, recorded data on Phoenix show and incredibly wrong modelization of Pitch, Roll and Yaw for Phoenix: By the way, is anything similar to Phoenix raw data available for unfortunate Schiaparelli mission? Or was it supposed to upload them once landed? Has it occurred to you that maybe the problem is your interpretation of the data, not that they are "incredibly wrong"? There was some realtime downlink of Schiaparelli data, I think it's described in the failure report. I'd be very surprised if it was online in raw form. Here's the Insight dump with 1-second intervals.
edl.zip ( 2.37MB )
Number of downloads: 380 |
| Forum: InSight · Post Preview: #241856 · Replies: 129 · Views: 147599 |
| Posted on: Nov 18 2018, 10:55 PM | |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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| Forum: InSight · Post Preview: #241847 · Replies: 129 · Views: 147599 |
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