NASA Dawn Asteroid Mission Told to "Stand Back Up", Reinstated! |
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NASA Dawn Asteroid Mission Told to "Stand Back Up", Reinstated! |
| Guest_Analyst_* |
 Apr 20 2006, 08:00 AM
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#76
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Guests  |
Thank you, Bruce.
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Apr 20 2006, 09:31 AM
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#77
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 Senior Member  Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
QUOTE (BruceMoomaw @ Apr 18 2006, 10:48 PM)  the more rapidly rising cost of Delta 2 boosters Interesting. Why are Delta 2s becoming more expensive? Does the same go for all boosters out there, being a result of increased demand or something else? -------------------- |
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| Guest_Analyst_* |
Apr 20 2006, 03:17 PM
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#78
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Guests |
I guess it's not rising but falling demand. A large fraction of the costs (workforce, machines, management, launch pad maintaining etc.) are fixed, this means they are the same if you built and launch 4 boosters or 10 each year. Air Force demand is zero after the last GPS 2R launch in aboaut two years and commercial missions are zero right now. This leaves NASA as the only customer. The per unit costs are rising because they must cover all fixed costs.
I believe Delta II will be retired anyway in a couple of years in favour of the EELVs (Atlas V and Delta IV): More powerful (even if not needed for Scout or Discovery or EOS) BUT more expensive too. I don't see a replacement for the Delta II (Falcon 5 doesn't count). Will it be still around in 2011 for Mars Scout 2? Analyst |
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| Guest_BruceMoomaw_* |
Apr 20 2006, 08:31 PM
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#79
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Guests |
"Analyst" is correct -- as the demand for Delta 2 falls, it costs more per booster to keep the assembly line going. The problem of what to do when Delta 2 production finally shuts off completely has been a problem for some time in NASA's space science division, and as far as I know they're still squabbling about it.
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Apr 20 2006, 08:40 PM
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#80
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 Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
Bruce:
SeaLaunch on Zenit-2. Bob Shaw -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Apr 20 2006, 10:36 PM
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#81
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
Sea Launch is 5200kg to GTO
Delta II Heavy - 2064 to GTO Sea Launch is more like a low end Delta IV in terms of performance ( at one point I believe it held the outright commercial payload mass record ) Doug |
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Apr 21 2006, 10:40 AM
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#82
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
The europeans ran into the same "oops.... how do we launch mid-sized payloads" trap when the nuked the Ariane 1-4 series production line. Gee... Wonder why they're building a Soyuz launch pad in Guyana?
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Apr 21 2006, 07:43 PM
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#83
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Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
QUOTE (djellison @ Apr 20 2006, 11:36 PM) Sea Launch is 5200kg to GTO Delta II Heavy - 2064 to GTO Sea Launch is more like a low end Delta IV in terms of performance ( at one point I believe it held the outright commercial payload mass record ) Doug Doug: Dual launches, anyone? Ariane 5 does it as standard! SeaLaunch is more-or-less American, and could launch not only from equatorial regions but also from Florida or California, making use of all the existing range infrastructures. Bob Shaw -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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| Guest_BruceMoomaw_* |
Apr 22 2006, 02:06 AM
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#84
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Guests |
Yeah, but most Solar System launches have limited launch windows -- and with a dual launch, you have two payloads instead of just one that might run into technical problems serious enough to make your probe miss its window.
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Apr 22 2006, 02:19 AM
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#85
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
QUOTE (Bob Shaw @ Apr 20 2006, 03:40 PM) SeaLaunch on Zenit-2. I haven't heard that new rocket model: SeaLaunch. Are you referring it to Soyuz? Rodolfo |
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Apr 22 2006, 02:21 AM
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#86
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 Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
[quote name='RNeuhaus' _quote in reply -removed
[/quote] No, SeaLaunch is a cooperative project between the russians (RKK Energia I think) and Boeing which launches satellites from the ocean - hence "sealaunch." -------------------- |
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Apr 22 2006, 03:46 PM
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#87
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
zenit is the rocket model
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Apr 22 2006, 05:13 PM
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#88
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Member Group: Members Posts: 688 Joined: 20-April 05 From: Sweden Member No.: 273 |
How about Long March 2 - 3370 kg to GTO
 tty |
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Apr 22 2006, 07:57 PM
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#89
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 Member Group: Members Posts: 321 Joined: 6-April 06 From: Cape Canaveral Member No.: 734 |
QUOTE (Bob Shaw @ Apr 21 2006, 03:43 PM) Doug: Dual launches, anyone? Ariane 5 does it as standard! SeaLaunch is more-or-less American, and could launch not only from equatorial regions but also from Florida or California, making use of all the existing range infrastructures. Bob Shaw Sealaunch is at the higher end of the EELV medium class.. US gov't payloads can't use Sealaunch. So far only 3 companies have vehicle that are certified to launch NASA payloads. |
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Apr 27 2006, 01:54 PM
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#90
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 Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
Mark Rayman has created his first log of the renewed DAWN mission.
He did the same for Deep Space 1. STELLAR CHEMISTRY - The DAWN Of A New Mission Marks Log Entry Number One http://www.spacedaily.com/reports/The_DAWN...Number_One.html Pasadena CA (SPX) Apr 27, 2006 - NASA's next planned venture into the solar system, Dawn is a collaborative effort of scientists, engineers and people in other disciplines at JPL, UCLA, Orbital Sciences Corp., the space agencies of Germany and Italy, and other universities and private companies in the United States and elsewhere. -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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