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#180
by
ugordan
on 31 Jul, 2011 15:00
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I don't think it is orbiting at that velocity
The 44 km/s at perijove doesn't sound that far-fetched to me, it does skim very low above the cloudtops, only 5000 km according to the press kit.
Still, no orbiter will ever match the almost 48 km/s of Galileo probe which came in with some hyperbolic excess velocity and slammed deep into the gravity well at entry interface.
Edit: yep, for an object travelling at 45 km/s toward Jupiter's cloudtops, that 5000 km altitude difference is traversed in 110 seconds meaning Jupiter's gravity adds some 2.7 km/s which accounts for most of the Galileo probe - Juno difference. The rest of several hundred m/s being accounted for by the Juno JOI burn.
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#181
by
Rocket Guy
on 31 Jul, 2011 16:16
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I believe the Helios probes hold the fastest velocity record.
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#182
by
Jim
on 31 Jul, 2011 16:21
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I don't think it is orbiting at that velocity
The 44 km/s at perijove doesn't sound that far-fetched to me, it does skim very low above the cloudtops, only 5000 km according to the press kit.
Still, no orbiter will ever match the almost 48 km/s of Galileo probe which came in with some hyperbolic excess velocity and slammed deep into the gravity well at entry interface.
Edit: yep, for an object travelling at 45 km/s toward Jupiter's cloudtops, that 5000 km altitude difference is traversed in 110 seconds meaning Jupiter's gravity adds some 2.7 km/s which accounts for most of the Galileo probe - Juno difference. The rest of several hundred m/s being accounted for by the Juno JOI burn.
copy
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#183
by
jsmjr
on 31 Jul, 2011 16:35
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From the NASA tweetup agenda, Thursday we'll go on a tour of KSC and CCAFS, including the Atlas V Spaceflight Operations Center and Launch Complex 41. Where exactly is the former?
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#184
by
Jim
on 31 Jul, 2011 16:56
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#185
by
Jim
on 31 Jul, 2011 16:58
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From the NASA tweetup agenda, Thursday we'll go on a tour of KSC and CCAFS, including the Atlas V Spaceflight Operations Center and Launch Complex 41. Where exactly is the former?
I will be in the ASOC every day until launch
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#186
by
jsmjr
on 31 Jul, 2011 17:16
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From the NASA tweetup agenda, Thursday we'll go on a tour of KSC and CCAFS, including the Atlas V Spaceflight Operations Center and Launch Complex 41. Where exactly is the former?
I will be in the ASOC every day until launch
Thanks for the locator link. It was one of my top candidate locations.
If you cross paths with a motley crew numbering some 150± wandering around the site Thursday afternoon, wave. Anything good in the high bay these days for us to see?
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#187
by
Jim
on 31 Jul, 2011 17:19
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From the NASA tweetup agenda, Thursday we'll go on a tour of KSC and CCAFS, including the Atlas V Spaceflight Operations Center and Launch Complex 41. Where exactly is the former?
I will be in the ASOC every day until launch
Thanks for the locator link. It was one of my top candidate locations.
If you cross paths with a motley crew numbering some 150± wandering around the site Thursday afternoon, wave. Anything good in the high bay these days for us to see?
MSL Atlas and Centaur
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#188
by
jsmjr
on 31 Jul, 2011 17:59
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From the NASA tweetup agenda, Thursday we'll go on a tour of KSC and CCAFS, including the Atlas V Spaceflight Operations Center and Launch Complex 41. Where exactly is the former?
I will be in the ASOC every day until launch
Thanks for the locator link. It was one of my top candidate locations.
If you cross paths with a motley crew numbering some 150± wandering around the site Thursday afternoon, wave. Anything good in the high bay these days for us to see?
MSL Atlas and Centaur
Well that's certainly worth seeing! (If they let us in there.) Also, looking back at my STS-133 causeway photos, I realized I had a picture of the ASOC taken from there. (Attached.) What are the two tall buildings to the right? On Google Maps it's apparent they are both a good deal farther away, down Titan III Road. The middle one is blocking the view of SLC-41 (except for one lightning tower).
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#189
by
Jim
on 31 Jul, 2011 18:05
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SMAB and SMARF
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#190
by
FinalFrontier
on 31 Jul, 2011 19:22
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Quick question. At top speed, how fast will this sucker be going (in mph)?
Thanks.
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#191
by
Cog_in_the_machine
on 31 Jul, 2011 19:38
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#192
by
jsmjr
on 31 Jul, 2011 20:00
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Is there anyway to find out if Playalinda Beach will be closed, without just turning up on launch day?
Some googling reveals it's a nudist beach, that could be a fun experience
http://www.nps.gov/cana/planyourvisit/park-closure-notices.htm
That page will be updated with any closure notice usually about 3 or 4 days before they close. Shuttle launches they closed about 3 days prior to launch, but I don't think they do that with the unmanned. Honestly haven't watched it close enough to be sure.
Per ULA's press kit (attached ground trace map) the launch looks pretty much straight out to sea. Without RTG type issues, Playlandia seems like it should be open?
Also, wonder if our friends in NW Australia should be watching for a Centaur burn? (Can one see that sort of thing?)
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#193
by
Rocket Guy
on 31 Jul, 2011 20:56
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The vehicle's trajectory out to sea is not related to whether it would be open or not. It should be open, but as it has been closed for other Atlas V missions before at NASA's discretion, it remains to be seen.
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#194
by
Prober
on 31 Jul, 2011 21:36
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From the NASA tweetup agenda, Thursday we'll go on a tour of KSC and CCAFS, including the Atlas V Spaceflight Operations Center and Launch Complex 41. Where exactly is the former?
I will be in the ASOC every day until launch
Any live web cam feed we could watch you work?
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#195
by
Prober
on 31 Jul, 2011 21:37
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I believe the Helios probes hold the fastest velocity record.
How do these compare with the "Dawn" probe for velocity?
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#196
by
kch
on 31 Jul, 2011 21:50
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Is there anyway to find out if Playalinda Beach will be closed, without just turning up on launch day?
Some googling reveals it's a nudist beach, that could be a fun experience
http://www.nps.gov/cana/planyourvisit/park-closure-notices.htm
That page will be updated with any closure notice usually about 3 or 4 days before they close. Shuttle launches they closed about 3 days prior to launch, but I don't think they do that with the unmanned. Honestly haven't watched it close enough to be sure.
Per ULA's press kit (attached ground trace map) the launch looks pretty much straight out to sea. Without RTG type issues, Playlandia seems like it should be open?
Freudian slip?
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#197
by
FinalFrontier
on 31 Jul, 2011 22:01
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Quick question. At top speed, how fast will this sucker be going (in mph)?
99419.390 mph.
Courtesy of this - http://www.metric-conversions.org/length/kilometers-to-miles.htm
Hot damn! That's extremely fast. Will this really be the fastest man made moving object in history? (heard that somewhere earlier in reference to this mission)
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#198
by
alexw
on 31 Jul, 2011 22:06
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Hot damn! That's extremely fast. Will this really be the fastest man made moving object in history? (heard that somewhere earlier in reference to this mission)
Pluto New Horizons was the only other Atlas V 551 launch, and massed a few thousand kilos less.
-Alex
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#199
by
hop
on 31 Jul, 2011 22:11
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Hot damn! That's extremely fast. Will this really be the fastest man made moving object in history? (heard that somewhere earlier in reference to this mission)
Fastest relative to what ?
Anyway, as ugordon already said, the Galileo probe was faster relative to Jupiter (which is what the above number refers to).
Messenger orbits that Sun at ~48 km/s, simply by virtue of being in orbit around Mercury.
Edit:
The New Horizons "record" refers to launch velocity. The Dawn "record" refers to dV produced by the spacecraft itself. Voyager 1 holds the record for greatest hyperbolic excess relative to the sun AFAIK. Apples, oranges and orangutans.
