New Horizons, Pluto and the Kuiper belt |
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New Horizons, Pluto and the Kuiper belt |
 Sep 12 2008, 03:16 PM
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#1126
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 Senior Member  Group: Members Posts: 3535 Joined: 1-October 05 From: Croatia Member No.: 523  |
QUOTE (Alan Stern @ Sep 12 2008, 05:12 PM)  So now the simulator is laced up with diagnostic tools to catch the next one in the act so we can, hopefully, get to root cause. Of course, as things often go, adding debugging information to an existing real-time system can change timing issues and even completely eliminate further occurences of a fault. Debugging is a tricky business. I understand how frustrating this must be for your team, I can only wish you happy hunting! -------------------- |
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Sep 14 2008, 02:58 PM
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#1127
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Senior Member Group: Members Posts: 1008 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
QUOTE (ugordan @ Sep 12 2008, 07:16 AM) Of course, as things often go, adding debugging information to an existing real-time system can change timing issues and even completely eliminate further occurences of a fault. We used to call that a "Heisenbug." They're the worst. --Greg |
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Sep 15 2008, 11:11 AM
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#1128
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 Member Group: Members Posts: 120 Joined: 30-December 05 Member No.: 628 |
I suppose this is egregiously off topic and even slightly political, but isn't it wonderful to call a bug a "bug" instead of an "issue"?
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Sep 15 2008, 11:38 AM
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#1129
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Member Group: Members Posts: 419 Joined: 19-February 05 Member No.: 173 |
The NH mission ops team is updating the spacecraft's onboard fault protection/correction Autonomy software today/tomorrow with about 40 improvements. This is step two of the flight software redux. Last week was C&DH. After Autonomy this week, will be Guidance & Control software (G&C) next week to complete the comprehensive set of bug fixes and capability upgrades we've been working on for 18 months.
-Alan |
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Sep 15 2008, 11:41 AM
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#1130
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 The Poet Dude Group: Moderator Posts: 5546 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Uh oh, I got a bad feeling about this... innocently updating systems, upgrading capabilities... this is how Skynet started out...
 
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Sep 15 2008, 12:49 PM
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#1131
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Member Group: Members Posts: 419 Joined: 19-February 05 Member No.: 173 |
QUOTE (Stu @ Sep 15 2008, 12:41 PM) Uh oh, I got a bad feeling about this... innocently updating systems, upgrading capabilities... this is how Skynet started out... Skynet-- Well, we don't *innocently* do anything on NH, and all three of these flight software packages have previously been updated in flight. Of course, Murphy Always Lurks, which of course as an acronym spells the first three letters in MALfunction so we test the hell out of this stuff on the spacecraft ground simulator. -Alan |
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Sep 15 2008, 05:08 PM
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#1132
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Member Group: Members Posts: 173 Joined: 9-September 08 Member No.: 4334 |
QUOTE (Stu @ Sep 15 2008, 11:41 AM) Uh oh, I got a bad feeling about this... innocently updating systems, upgrading capabilities... this is how Skynet started out... Well, at least NH is flying away from us at unprecedented speeds, so I doubt it'll be starting any apocalyptic wars... |
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Sep 16 2008, 01:29 PM
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#1133
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Member Group: Members Posts: 249 Joined: 5-January 07 From: Manchester England Member No.: 1563 |
You never know...I've never trusted the things!
 Actually to get myself a bit less computer phobic i've been thinking of writing a fortran program to recreate the new horizons mission, basically calculating the trajectory and fuel requirments for earth to jupiter to pluto and beyond. Does anyone have any idea where I could go for some resources, or any suggestions on where to start? -------------------- |
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Sep 16 2008, 01:55 PM
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#1134
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 Administrator Group: Chairman Posts: 13250 Joined: 8-February 04 Member No.: 1 |
Start with Orbiter ( www.orbitersim.com ) and its addons ( www.orbithangar.com )
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Sep 16 2008, 02:27 PM
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#1135
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Senior Member Group: Members Posts: 1008 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
QUOTE (marsbug @ Sep 16 2008, 06:29 AM) You never know...I've never trusted the things! Actually to get myself a bit less computer phobic i've been thinking of writing a fortran program to recreate the new horizons mission, basically calculating the trajectory and fuel requirments for earth to jupiter to pluto and beyond. Does anyone have any idea where I could go for some resources, or any suggestions on where to start? You want to write one from scratch, or just use one that already exists? If you're going to write it yourself, I'd really suggest you use something a bit more modern than Fortran, though. Java, if you're a Linux guy, or C#, if you have Windows might be nice. Or try Python (on either platform) for something even gentler. --Greg |
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Sep 16 2008, 07:08 PM
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#1136
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 Senior Member Group: Admin Posts: 4503 Joined: 15-March 05 From: Sloughhouse, CA Member No.: 197 |
QUOTE (Greg Hullender @ Sep 16 2008, 07:27 AM) I'd really suggest you use something a bit more modern than Fortran, though. Agreed. All those stacks of cards can be difficult to handle. -------------------- If Occam had heard my theory, things would be very different now.
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Sep 17 2008, 09:50 AM
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#1137
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Member Group: Members Posts: 249 Joined: 5-January 07 From: Manchester England Member No.: 1563 |
I was planning on using Fortran, mainly because its the only language i have any experience with and I already have a compiler, and starting from scratch. I haven't made any solid plans yet though. I'm still going through my old uni notes on things like transfer orbits. Does anyone know where I might look for some details on how launch windows for gravitational assists are calculated? My notes only skim over it briefly.
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Oct 15 2008, 06:45 PM
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#1138
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 Member Group: Members Posts: 521 Joined: 20-April 05 From: Poland Member No.: 299 |
1,000 days and counting.
http://pluto.jhuapl.edu/overview/piPerspective.php Alan Stern has right, it’s hard to believe. -------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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Oct 19 2008, 01:49 PM
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#1139
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Junior Member Group: Members Posts: 51 Joined: 28-October 06 From: New York State Member No.: 1294 |
Upon reading the New Horizons Twitter page, I found a message that said, "Did you know? N.H. is carrying 9 items of memorabilia to Pluto and the Kuiper Belt. After flying 1000 days, the list will be released soon!"
Despite extensive internet searching I cannot find the list. Does anybody know (off the top of their head) if and when it will be released to the public? -------------------- "For we took nothing into this world, and it is certain that we will carry nothing out of it.
Or what shall it profit a man, if he shall gain the whole world, and lose his own soul?" |
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Oct 19 2008, 01:57 PM
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#1140
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Member Group: Members Posts: 419 Joined: 19-February 05 Member No.: 173 |
QUOTE (John Flushing @ Oct 19 2008, 02:49 PM) Upon reading the New Horizons Twitter page, I found a message that said, "Did you know? N.H. is carrying 9 items of memorabilia to Pluto and the Kuiper Belt. After flying 1000 days, the list will be released soon!" Despite extensive internet searching I cannot find the list. Does anybody know (off the top of their head) if and when it will be released to the public? Tuesday or so. Perhaps you want to start guessing what we sent.... |
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