Dawn Cruise |
Dawn Cruise |
Sep 27 2007, 12:31 PM
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#101
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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 1 2010, 05:11 PM
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#102
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Member Group: Members Posts: 340 Joined: 11-April 08 From: Sydney, Australia Member No.: 4093 |
Dawn has published the first arrival trajectory kernels. They're likely to change, but still it is very interesting to see how different the approach to a "traditional" orbit insertion will be, mainly due to the lack of a short and decisive orbit insertion burn. According to that trajectory data:
1) Dawn is captured by Vesta (i.e. orbit eccentricity < 1) on 21 July 2011 05:08:35 whilst still 15,756km away from (the center of) Vesta, and at a relative speed of 0.048km/s 2) Dawn achieves its initial orbit (near-circular 3003x2994km) on 04 August 2011 17:29:53. Ion thrusting ceases at around the same time (otherwise the resulting orbit wouldnt be circular). Relative speed then is 0.077km/s -------------------- |
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Mar 1 2010, 06:04 PM
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#103
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Member Group: Members Posts: 753 Joined: 23-October 04 From: Greensboro, NC USA Member No.: 103 |
... 1) Dawn is captured by Vesta (i.e. orbit eccentricity < 1) on 21 July 2011 05:08:35 whilst still 15,756km away from (the center of) Vesta, and at a relative speed of 0.048km/s 2) Dawn achieves its initial orbit (near-circular 3003x2994km) on 04 August 2011 17:29:53. Ion thrusting ceases at around the same time (otherwise the resulting orbit wouldnt be circular). Relative speed then is 0.077km/s For us Americans, the capture speed is 107 mph, and the relative speed in orbit is 177 mph. That's pretty darned slow! -------------------- Jonathan Ward
Manning the LCC at http://www.apollolaunchcontrol.com |
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