Dawn Cruise |
Dawn Cruise |
Sep 27 2007, 12:31 PM
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#1
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Member Group: Members Posts: 100 Joined: 11-October 04 From: Oxford, UK (Glasgow by birth) Member No.: 101 |
Pushing out of Earth orbit now...........
-------------------- "There are 10 types of people in the world - those who understand binary code, and those who don't."
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Mar 20 2008, 04:34 PM
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#2
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Member Group: Members Posts: 571 Joined: 20-April 05 From: Silesia Member No.: 299 |
I nearly forgot about these cancelled missions.
Pre-Dawn: The French-Soviet VESTA mission Very interesting three proposed trajectory for two spacecrafts. Trajectory 1: -launch from Earth -Mars gravity assist -flyby of 2335 James (a 10 km X-type asteroid) (an Amor-asteroid) -Mars gravity assist -109 Felicitas (C-type, 76 km) -739 Mandeville (EMP(?) type, 110 km) -4 Vesta (V-type, or Vestoid. Has a diameter of 570 km) flyby with 3.5 km/s. A penetrator is released. Total delta-v: 450 m/s Trajectory 2: -launch from Earth -Mars gravity assist -flyby of the P/Tritton short period comet -Mars gravity assist -2087 Kochera (30 km?) -1 Ceres (flyby & releasing a penetrator) Total delta-v: 1150 m/s Trajectory 3: -launch from Earth -Mars gravity assist -1204 Renzia (10 km?) (an Amor-asteroid) -Mars gravity assist -435 Ella (U type, 30 km) -46 Hestia (F type, 165 km) -135 Hertha (M type, 80 km) Total delta-v: 350 m/s -------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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Jun 30 2008, 06:41 AM
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#3
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Member Group: Members Posts: 340 Joined: 11-April 08 From: Sydney, Australia Member No.: 4093 |
I noticed the following paragraph in the above article: QUOTE I've heard it's not ruled out that Dawn will be directed to rendezvous with 2 Pallas (for a slow flyby) in 2018, after the main mission at Vesta and Ceres is completed and enough fuel is left. Is that possibly still on the cards? -------------------- |
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Jul 1 2008, 03:42 PM
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#4
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Junior Member Group: Members Posts: 47 Joined: 27-June 08 From: Ashford, Kent, United Kingdom. Member No.: 4244 |
I'm just pleased that we get regular updates on the mission. The possible post-main mission rendezvous with Pallas hasn't been mentioned for a while, but IIRC the mechanics of setting it up are difficult due to Pallas' orbit being appreciably out of ecliptic. Maybe the mission planners are going to present the relevant trajectories as a fait accompli when they're lobbying for that mission extension... I hope so. In December 2018, 2 Palles is on the descending node. In fact DAWN would not even have to leave the plane of 1 Cere's orbit to do this, as 2 Pallas will intersect that plane. The biggest issues will be the supply of Xenon, & the state of the solar arrays, will they still be producing enough power? I really, really hope that the 2 Pallas option stays open. To bag all three of the Asteroid Belt's largest members would be a real accomplishment. However 2 Pallas would not be orbited, but could be a slow encounter, enabling much of the giant asteroid to be seen at a fairly high resolution. Whilst 4 Vesta & 1 Ceres are primary mission aims, I think to not lose sight of 2 Pallas as an encore right at the very end, would be worthwhile. No decent Hubble Space Telescope images exist of 2 Pallas do they, or have I not been able to find them? Andrew Brown. -------------------- "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.
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Jul 1 2008, 04:55 PM
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#5
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
No decent Hubble Space Telescope images exist of 2 Pallas do they, or have I not been able to find them? from http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2502.pdf "Figure 1: Pallas imaged by HST in 336nm UV filter." -------------------- If Occam had heard my theory, things would be very different now.
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Jul 1 2008, 05:01 PM
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#6
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Member Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
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