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Unmanned Spaceflight.com > All posts by a member| Posted on: Jan 13 2021, 04:52 PM | |
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Senior Member  Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 
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QUOTE (volcanopele @ Jan 13 2021, 07:33 AM)  JunoCam might be able to do decent Jupiter-shine imaging... The main issue with the encounters is the spacecraft spin and the maximum cadence of imaging. So we can't take images as quickly as we might like, it may take 2-3 spin periods between images. And we have data volume constraints as well. We could use a lot of TDI for nightside imaging, but it frankly hadn't occurred to me to try it, and I'm not sure how well it would work. But this is something we could try for the earlier Io encounters to see if they would be worthwhile for the close ones. |
| Forum: Juno · Post Preview: #249218 · Replies: 88 · Views: 208465 |
| Posted on: Jan 13 2021, 04:07 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Decepticon @ Jan 12 2021, 11:35 PM) Does Amalthea come close to being imaged? Juno gets to within 42000 km of Amalthea on 2025-07-13 but it will only be 8 pixels or so across. Remember that the encounters with the Galileans are as much about changing the orbit as about doing satellite science, and Amalthea is not useful for the former. |
| Forum: Juno · Post Preview: #249214 · Replies: 88 · Views: 208465 |
| Posted on: Jan 13 2021, 12:08 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (volcanopele @ Jan 12 2021, 02:40 PM) Looks like best imaging along terminator at around 48°W. Something like that, but note that I think this is a little past closest approach. We come in on the night side so the best visible imaging is on the outbound leg, where the resolution is going down fairly quickly. It'll be cool regardless, but I don't want to oversell it. |
| Forum: Juno · Post Preview: #249208 · Replies: 88 · Views: 208465 |
| Posted on: Jan 12 2021, 05:27 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (mcaplinger @ Jan 9 2021, 10:01 AM) we won't know for sure until the final flyby geometry is established. The SPK file for the current baseline (which may change) is at https://naif.jpl.nasa.gov/pub/naif/JUNO/ker...1021_210111.bsp if people want to look at it. See https://naif.jpl.nasa.gov/pub/naif/JUNO/ker..._210111.bsp.lbl for info on the flybys. CODE Satellite Flyby Events Satellite Time Range vInf Lat W.Lon Phase Alt. km km/s deg deg deg km Ganymede 07-JUN-2021 16:56:07 UTC 3676.38 18.427 23.63 55.23 98.2 1045.2 Ganymede 20-JUL-2021 16:48:30 UTC 52631.20 17.885 -22.46 235.80 80.9 50000.0 Europa 16-OCT-2021 08:46:28 UTC 82920.00 22.502 50.00 217.54 89.8 81359.2 Europa 24-FEB-2022 18:15:38 UTC 48472.17 23.501 77.33 128.35 100.6 46911.4 Io 05-JUL-2022 04:55:50 UTC 87913.57 29.490 77.93 172.05 92.8 86092.0 Europa 29-SEP-2022 09:36:04 UTC 1916.98 23.581 -0.84 49.08 130.1 356.2 Io 14-DEC-2022 23:16:05 UTC 65547.98 30.270 75.99 112.84 100.5 63726.4 Io 01-MAR-2023 01:32:03 UTC 53390.33 29.020 55.00 208.59 71.0 51568.7 Io 16-MAY-2023 03:15:49 UTC 39219.03 29.290 54.18 206.71 67.8 37397.4 Io 31-JUL-2023 04:57:16 UTC 23988.43 29.723 65.11 188.22 77.3 22166.8 Io 15-OCT-2023 06:47:26 UTC 13448.57 29.811 65.86 182.35 77.4 11627.0 Io 30-DEC-2023 08:36:10 UTC 3316.44 30.027 63.69 94.23 108.9 1494.8 Io 03-FEB-2024 17:48:50 UTC 3245.51 30.139 -32.67 35.81 143.6 1423.9 Io 09-APR-2024 05:00:37 UTC 20373.15 29.988 -66.56 294.64 81.5 18551.6 Io 25-NOV-2024 05:33:31 UTC 85679.33 28.794 -55.42 278.23 74.5 83857.7 Io 08-MAY-2025 18:03:36 UTC 90943.96 30.643 -58.63 339.88 113.7 889122.4 |
| Forum: Juno · Post Preview: #249201 · Replies: 88 · Views: 208465 |
| Posted on: Jan 9 2021, 11:28 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (antipode @ Jan 9 2021, 02:55 PM) I better read those posts, maybe its in there. Start with https://www.lpi.usra.edu/opag/meetings/opag...Bolton_6011.pdf and https://www.lpi.usra.edu/NASA-academies-res...nior-Review.pdf It doesn't look like the final extended mission proposal from Juno was made public, so you have to infer what it may have said from the review of it. |
| Forum: Juno · Post Preview: #249193 · Replies: 88 · Views: 208465 |
| Posted on: Jan 9 2021, 06:01 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Antdoghalo @ Jan 8 2021, 07:21 PM) Large Swaths of Ganymede may be improved depending on how close it is. Bolton's presentation to OPAG (linked upthread) said the minimum altitude of the Ganymede flyby was 1000 km, at which Junocam would get ~670 meters/pixel resolution. It's a bit hard to say what the best resolution in the current coverage is, but it's probably better than that in most places, and the gaps are near the north and south poles, which AFAIK won't be seen in this encounter. As I said, we won't know for sure until the final flyby geometry is established. Note that this first Ganymede flyby is in mid-2021. [I guess I should mention that my perspective is obviously Junocam-centric and JIRAM will also get images, which are both higher-resolution and not subject to the limitations of darkness.] |
| Forum: Juno · Post Preview: #249186 · Replies: 88 · Views: 208465 |
| Posted on: Jan 9 2021, 05:18 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Brian Swift @ Jan 9 2021, 12:06 AM) Mike, do you know yet if MSS [sic, it's MSSS] will be doing any additional (beyond current operations) JunoCam work due to extended mission? Planning the satellite encounters and processing the results is obviously beyond the scope of what we've been doing so far, so yes. |
| Forum: Juno · Post Preview: #249185 · Replies: 88 · Views: 208465 |
| Posted on: Jan 9 2021, 01:29 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE "Imaging observations will search for changes since Voyager and Galileo..." If the regions that had no previous coverage were going to be imaged, I think it would have said something different. However, we won't really be sure until the new maneuver design is finalized what each encounter will look like, and there are many constraints on s/c attitude that also factor in. |
| Forum: Juno · Post Preview: #249177 · Replies: 88 · Views: 208465 |
| Posted on: Jan 8 2021, 06:55 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Antdoghalo @ Jan 8 2021, 10:22 AM) Cool map but it doesn't go pole to pole. You're going to have a hard time finding a shadowless map of the polar regions.  |
| Forum: Image Processing Techniques · Post Preview: #249165 · Replies: 12 · Views: 15198 |
| Posted on: Jan 8 2021, 04:55 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Antdoghalo @ Jan 7 2021, 10:39 PM) I am trying to find maps of the moon that have the least possible amount of shadows in them. What about http://wms.lroc.asu.edu/lroc/view_rdr/WAC_EMP ? |
| Forum: Image Processing Techniques · Post Preview: #249156 · Replies: 12 · Views: 15198 |
| Posted on: Jan 7 2021, 11:44 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Fox @ Jan 7 2021, 02:13 PM) A question out of just curiosity. Pioneer 10's last signal that returned telemetry was from 2002 (https://www.nasa.gov/centers/ames/news/releases/2003/03_25HQ.html). I know that the original science data from the 1970s flybys isn't completely preserved in the PDS (some of it is, not all). But what about from the later communications, through the 90s and up to that last 2002 signal? https://nssdc.gsfc.nasa.gov/nmc/spacecraft/...aftId=1972-012A https://spdf.gsfc.nasa.gov/pub/data/pioneer/ The later stuff isn't really appropriate for any of the PDS nodes since there are no planets out there  |
| Forum: Voyager and Pioneer · Post Preview: #249154 · Replies: 2 · Views: 17071 |
| Posted on: Jan 5 2021, 10:32 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Decepticon @ Jan 5 2021, 12:54 PM) Extended mission has been approved? Not yet AFAIK. |
| Forum: Juno · Post Preview: #249149 · Replies: 27 · Views: 23851 |
| Posted on: Jan 4 2021, 11:46 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (volcanopele @ Jan 4 2021, 03:25 PM) Appears to be Ganymede Io is coming in the next batch just for you, Jason! May be out there already. |
| Forum: Juno · Post Preview: #249140 · Replies: 27 · Views: 23851 |
| Posted on: Jan 1 2021, 12:47 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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First nine PJ31 images on missionjuno. |
| Forum: Juno · Post Preview: #249118 · Replies: 27 · Views: 23851 |
| Posted on: Dec 31 2020, 03:44 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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We've started getting images back from PJ31, but I'm not sure when they'll show up on missionjuno due to the holiday schedule. |
| Forum: Juno · Post Preview: #249114 · Replies: 27 · Views: 23851 |
| Posted on: Dec 22 2020, 06:58 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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New EDL video: https://images.nasa.gov/details-JPL-2020122...%20w%20SFX.html My obligatory link to a comic on my office door: https://i.pinimg.com/originals/e0/32/a0/e03...c0a1fbc5f1f.jpg (Overlook the technical errors in the first two panels, it's still funny.) |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #249052 · Replies: 75 · Views: 93860 |
| Posted on: Dec 21 2020, 12:02 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Gerald @ Dec 20 2020, 03:44 PM) Thus far my attempt of today to provide some, but a still incomplete, basis for further considerations. I think we can be confident that the team has thought about additional activities that could be tried to recover some of the HP3 science, and they are in a much better position than we are to evaluate what's possible and what's not. |
| Forum: InSight · Post Preview: #249036 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 19 2020, 06:21 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Gerald @ Dec 19 2020, 09:41 AM) With an idealized tilt angle of ~53° between the pointing of the mole and the surface normal... How could the tilt of the mole could be controlled? I'm not aware of any way to do this. |
| Forum: InSight · Post Preview: #249010 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 18 2020, 05:36 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (John Whitehead @ Dec 18 2020, 08:50 AM) These two steps will include figuring out how big the MAV really needs to be, and how much payload it really can carry... As noted upthread, back in April 2020 NASA showed every indication that they were ready to buy the flight rocket motors from NGIS ( https://beta.sam.gov/opp/349cbd728ab24d7693...true&page=1 ) One presumes that this never happened, reason unknown. I've seen progress. It doesn't look like this. |
| Forum: Past and Future · Post Preview: #249004 · Replies: 579 · Views: 574619 |
| Posted on: Dec 17 2020, 10:59 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Gerald @ Dec 17 2020, 10:26 AM) Shouldn't we try to squeeze out as much science as reasonably possible with the assets that are already available on Mars... What are you suggesting they do that they haven't done already? |
| Forum: InSight · Post Preview: #248995 · Replies: 1270 · Views: 1002250 |
| Posted on: Dec 11 2020, 07:54 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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New interactive Jezero geologic map at https://planetarymapping.wr.usgs.gov/interactive/sim3464 |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #248932 · Replies: 75 · Views: 93860 |
| Posted on: Dec 10 2020, 04:29 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Steve G @ Dec 10 2020, 07:32 AM) That was a really good read. We weren't that happy with it, since it's a whole lot of different stuff roughly stitched together and sort of veers between topics. But it didn't make sense to write separate papers either and it gets the basics across. You'll note that the Gopros considered originally didn't make the cut, but I know nothing about what the story is with that -- all I worked on was LCAM. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #248922 · Replies: 43 · Views: 137920 |
| Posted on: Dec 10 2020, 03:30 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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A paper describing the engineering cameras on M2020, including the EDL cameras and the TRN camera, is now online at https://link.springer.com/article/10.1007/s11214-020-00765-9 (open access). Enjoy. |
| Forum: Perseverance- Mars 2020 Rover · Post Preview: #248910 · Replies: 43 · Views: 137920 |
| Posted on: Nov 24 2020, 04:15 AM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (Gerald @ Nov 23 2020, 06:21 PM) In space in Earth orbit, at least... I've talked with people who worked on TSS-1 and -1R and they had quite a few stories about it. Let's just say that I don't think tether technology is quite ready for a Venus mission. |
| Forum: Venus · Post Preview: #248658 · Replies: 347 · Views: 664000 |
| Posted on: Nov 23 2020, 10:45 PM | |
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Senior Member Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497
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QUOTE (JRehling @ Nov 23 2020, 02:07 PM) As a non-mechanical engineer, I nonetheless share antipode's sense that a cable more than 20 km long seems to introduce some serious worries about practicality. To put it mildly. At any rate, most of the concepts are just for a balloon that can change altitude by various means (see https://www.lpi.usra.edu/vexag/reports/Venu...ssion_FINAL.pdf sections 3.2.3 and B.2.8.1 for one such concept). |
| Forum: Venus · Post Preview: #248652 · Replies: 347 · Views: 664000 |
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