Mro On Approach, TCM-3 not required |
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Mro On Approach, TCM-3 not required |
 Mar 10 2006, 07:27 PM
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#166
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Newbie  Group: Members Posts: 18 Joined: 12-February 04 Member No.: 28  |
I presume that MRO's velocity is increasing as it approaches Mars, the doppler graph showing departure from the ideal Newtonian orbit.
The frequency of the sawtooth envelope seems to be increasing; perhaps it's related to velocity. Or something. |
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Mar 10 2006, 08:04 PM
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#167
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Junior Member Group: Members Posts: 86 Joined: 12-October 05 From: Beijing Member No.: 526 |
Mars Reconnaissance Orbiter was only 20000 kilometers away from Mars at 2006-03-10 20:03:03 UTC.
velocity = 3.499 km/s range-rate = -3.340 km/s |
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Mar 10 2006, 09:17 PM
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#168
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Junior Member Group: Members Posts: 86 Joined: 12-October 05 From: Beijing Member No.: 526 |
Mars Reconnaissance Orbiter was only 5000 kilometers away from Mars at 2006-03-10 21:16:56 UTC.
velocity = 4.872 km/s range-rate = -2.694 km/s |
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Mar 10 2006, 09:47 PM
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#169
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 Member Group: Members Posts: 646 Joined: 23-December 05 From: Forest of Dean Member No.: 617 |
*tumbleweed* bounces past as MRO reaches LoS & passes behind Mars with engines firing... my fingernails can't take this!
-------------------- --
Viva software libre! |
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Mar 10 2006, 09:48 PM
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#170
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 Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
MRO took a distant image of Deimos!
http://photojournal.jpl.nasa.gov/catalog/PIA02699 Original Caption Released with Image: This image showing the position of the Martian moon Deimos against a background of stars is part of a successful technology demonstration completed by NASA's Mars Reconnaissance Orbiter before arrival at Mars. The spacecraft's Optical Navigation Camera was used in February and March 2006 to demonstrate the use of pictures from a small camera for calculating precise location of a Mars-bound spacecraft by comparing the observed positions of Mars' two moons to their predicted positions relative to background stars. While this technique was not necessary for the Mars Reconnaissance Orbiter's own navigation, the demonstration prepares the way for relying on it for navigating precise arrivals for future missions that land on Mars. This example image from the Optical Navigation Camera was taken on March 6, 2006, at a distance of 1.08 million kilometers (671,000 miles) from Deimos. That moon, the smaller of Mars' two, has a diameter of 15 kilometers (9 miles), and orbits 23,459 kilometers (14,577 miles) above the planet's surface. -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Mar 11 2006, 08:34 AM
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#171
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 Member Group: Members Posts: 257 Joined: 18-December 04 Member No.: 123 |
I was reading the online profile on the nasa site of Tracy Drain who appeared on the Live coverage yesterday a bit.
http://www.nasa.gov/mission_pages/MRO/news...f-20060307.html I came across this line and was quite surprised.  QUOTE "During the crucial hours of entering Mars orbit, Drain and the mission team will only be able to monitor events as they occur billions of miles away" The content was up only in the past few days so I guess it was a bit rushed. Still amusing though. -------------------- Turn the middle side topwise....TOPWISE!!
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Apr 20 2008, 09:50 PM
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#172
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Member Group: Members Posts: 163 Joined: 16-March 05 From: Oakville, Ontario, Canada Member No.: 201 |
QUOTE (jmknapp @ Feb 15 2006, 01:19 PM)  True--MRO's speed relative to Mars won't start to increase until Feb. 25, & even then only very slightly until the day of MOI (per the SPICE kernel data). Here's a chart of the speed for the month of March:  hate reviewing a long dead thread..but...  I'm looking for the graphic that was posted in the post. Anyone have something similar? I'd like to use it as part of a lesson on space flight in my class when discussing the "sphere of influence".any help would be appreciated cheers jb |
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