Star 48b Third-stage Motor, Leaving the solar system |
Star 48b Third-stage Motor, Leaving the solar system |
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#1
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Newbie ![]() Group: Members Posts: 11 Joined: 13-August 05 From: Belgium Member No.: 465 ![]() |
I suppose the STAR 48B third-stage, which put New Horizons on its trajectory towards Jupiter, follows about the same flight-path as the New Horizons spacecraft itself. If this is the case, will it too in the end leave our solar system?
Or has it been deflected after seperation from the spacecraft? |
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#2
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![]() Member ![]() ![]() ![]() Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 ![]() |
Both Voyagers had Centaur stages that left earth at interesting velocities in interesting directions, too. And the Voyager final solid stages would have had trajectories even closer to the the Voyagers.
Wonder what happened to them? |
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#3
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Member ![]() ![]() ![]() Group: Members Posts: 529 Joined: 19-February 05 Member No.: 173 ![]() |
All.
Things are going well here at the APL MOC. New Horizons is operating virtually flawlessly. TCM 1a and 1b are planned for 28 Jan and 30 Jan, respectively, with a total delta-V of 18 m/s-- which is far smaller than the 92 m/s budgeted for pre-flight. Good news! Today we are planning to complete the spacecraft's planned spin down to 5 RPM (was 68 RPM for the STAR-48 firing, is now 19.2 RPM after an open-loop burn on launch day). Once we slow it down this afternoon, we'll do the initial star tracker turn ons. Until then, we're still relying on the sun sensors and IMUs-- both of which are performing very well. The s/c temps are running a little hot, but that's just due to our attitude combined with our <1 AU helio distance (we're inside 1 AU because we launched near Earth's perihelion). About the heliocentric distance, we will be inside 1 AU until late on 29 Jan UT. That makes us officially an inner planet mission for the first 10 days, I guess. We will pass the orbit of Mars on 8 April, just a little after MRO gets there, and it had a 5.5 month head start. FYI-- The C/A to Jupiter is going to be at approx 6 hrs UTC on 28 Feb 2007. A better number will be forthcoming, but that is good to an accuracy of better than an hour already. C/A is to be at 32 RJ. Because we have to slow down in TCM-1a and TCM-1B by those 18 m/s, our intrepid Boeing STAR-48 third stage will beat New Horizons to Jupiter by 6 hrs. However, because it will not hit the Pluto aim point, it will not beat us to Pluto (a relief-- can you imagine us having to be the second to Pluto after all this, having been beat by a derelict Boeing upper stage?). In fact, the projected C/A distance of the third stage to Pluto will be 213 million km (well over 1 AU), occurring on 15 Oct 2015. -Alan |
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#4
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 ![]() |
Thanks Alan for the detailed info. Indeed, NH will break a new trip record between Earth and Mars with 2 months and 19 days. The old record trip record between Earth and Mars, I think, is held by Mariner IX which took 166 days (5 months and 16 days, at May 30, 1971-Nov 14, 1971). It is a milestone!
![]() Rodolfo |
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#5
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Member ![]() ![]() ![]() Group: Members Posts: 599 Joined: 26-August 05 Member No.: 476 ![]() |
QUOTE (RNeuhaus @ Jan 23 2006, 01:14 PM) Thanks Alan for the detailed info. Indeed, NH will break a new trip record between Earth and Mars with 2 months and 19 days. The old record trip record between Earth and Mars, I think, is held by Mariner IX which took 166 days (5 months and 16 days, at May 30, 1971-Nov 14, 1971). It is a milestone! ![]() The NH time of flight is for Earth to Mars orbit. Mars will be far away when NH crosses Mars orbit. For the purpose of records, there are two categories. One is from Earth to a Mars encounter (some arbitrary distance, e.g. 1000 km of Mars surface. Second is from Earth to Mars orbit. For the second case, I would guess the old record was held by Ulysses. |
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