Nh - The Launch Thread, Godspeed little one Options

[djellison]

I thought it was time, with the Atlas V about to roll out - for a new thread for NH for the launch etc.

Someone asked over at the HZ just how NH can go so fast, this was my reply....

How do you get a spacecraft to Jupiter in under a year? Easy. Make it very very light, and put it on a very very big rocket. The config of Atlas V rocket being used to launch NH (551 - 5m fairing, 5 solids, and one engine on the Centaur stage ) would typically put 8,670kg into GTO or 20,520 into LEO.
New Horizons is 478kg, and it's Star 48B 3rd stage is 2,137kg - so instead of hauling 20 tons, this vehicle is hauling about 2.5 tons thus you get a HUGE velocity out of it. AND, once it's done that, you have the final kick of the 48B, 591 thousand kgs-s (thus accelerating is all a further 3.5 - 4km/s ball park speed, if my maths is right)
At launch - the vehicle is 573,160kg. NH is 0.083% of it.
Imagine the Apollo entry capsule on top of a Saturn V...tiny tiny tiny... that was 5,800 kg on a 3,038,500kg rocket - 0.191% - more than double that percentage of NH. The cutaway's are almost comical, with this tiny gold-clad box on an enormous vehicle.
Basically - it's a LOT of rocket, and not a lot of payload.
For comparison, look how much fuss was made of Stardust that entered so quickly. It took >16 hrs to get from the distance of the moon to Utah. NH makes that journey in 9 hours
One thing the NH mission is not short of, is superlatives.

I'm not one for good luck charms (although I'll eat peanuts during a Martian EDL with the best of them), but this mission has been so long in coming, that it deserves every ounce of luck it can have - the best, most accurate launch possible, the cleanest checkout, and incident free cruise to Jupiter.

Goodluck and Godspeed little one, we're with you every step of the way.

Doug
PS - Alan, you're a credit to your field, spending so much time answering questions and writing the PI Perspectives, it's been a hell of a journey!

[Guest_Myran_*]

4-5 mph helvick? That was a humble start. Now its on the pad it will be a lot more soon. Even though New Horizon wont beat the Voyagers in the end.
Good luck little probe, I hope they did check your optics and fuel tank properly.

[ljk4-1]

01.12.06

J.D. Harrington
Headquarters, Washington
Phone: (202) 358-5241

George H. Diller
Kennedy Space Center, Fla.
Phone: (321) 867-2468

STATUS REPORT: ELV-011206

EXPENDABLE LAUNCH VEHICLE STATUS REPORT

MISSION: New Horizons
LAUNCH VEHICLE: Lockheed Martin Atlas V 551 (AV-010)
LAUNCH PAD: Complex 41
LAUNCH SITE: Cape Canaveral Air Force Station, Florida
LAUNCH DATE: Jan. 17, 2006
LAUNCH WINDOW: 1:24 p.m. - 3:23 p.m.

The Flight Readiness Review was successfully completed today at the
Kennedy Space Center. The launch of New Horizons remains scheduled
for Jan. 17. The White House Office of Science Technology Policy has
also given approval for the launch to proceed.

Final spacecraft closeouts are under way and will conclude Friday,
Jan. 13. The payload test team will be conducting spacecraft
electrical tests on Saturday, Jan. 14, and the fairing access doors
will be closed for flight.

Rollout of the Atlas V from the Vertical Integration Facility is
scheduled to occur at 10:30 a.m. on Monday, Jan. 16. That afternoon,
the storable RP-1 fuel will be loaded aboard the Atlas first stage
tank.

On Tuesday, Jan. 17, at 10:39 a.m., Pad 41 will be cleared of
personnel in preparation for cryogenic fueling operations which are
scheduled to begin at L-2 hours, or 11:24 a.m.