Dawn Cruise |
Dawn Cruise |
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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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Post
#2
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Junior Member ![]() ![]() Group: Members Posts: 57 Joined: 21-September 06 Member No.: 1172 ![]() |
Good news everyone!
Extended version of the Dawn trajectory is now available at HORIZONS (two additional segments till April 2008). I did some simulations and found that Dawn will pass within 0.048 AU from comet 79P/du Toit-Hartley somewhere around March 17, 2008. Exact date and distance depends on actual thrusting, nevertheless, upcoming event will be the closest of this kind till EPOXI encounter with comet Hartley-2. Comet 79P was rediscovered last November in its 5th apparition and will pass perihelion in May 2008. That's a faint comet, but I hope not a smallest one. Even with coma/tail size of 20-30 thousands km Framing Camera and VIR spectrometer will be able to distinguish some details. I think that's a good opportunity to test and calibrate instruments on the real object, especially for VIR, which is a relative of Rosetta's VIRTIS spectrometer. PS Attached image features comet orbit, Dawn trajectrory and planets positions on March 17, 2008. |
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