My Assistant
| Posted on: Dec 23 2007, 07:24 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Are they ring-laser gyro IMUs, or are they mechanical? The MERs use the popular LN-200 IMU. Full specs here: http://www.nsd.es.northropgrumman.com/Auto...cts/LN-200.html |
| Forum: Mars · Post Preview: #106208 · Replies: 186 · Views: 141716 |
| Posted on: Dec 18 2007, 04:43 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
The flyby mission description is now up. |
| Forum: Titan · Post Preview: #105854 · Replies: 57 · Views: 57201 |
| Posted on: Dec 15 2007, 02:24 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
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| Forum: Lunar Exploration · Post Preview: #105696 · Replies: 12 · Views: 13880 |
| Posted on: Dec 10 2007, 10:44 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Gene Cernan said Moondust smelled like burnt gunpowder. Jim Garvin has said that Mars would have a similar odor to volcanic areas on Earth (sulfur-rich). |
| Forum: Spirit · Post Preview: #105449 · Replies: 429 · Views: 278369 |
| Posted on: Dec 10 2007, 08:29 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
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| Forum: Chit Chat · Post Preview: #105443 · Replies: 20 · Views: 17286 |
| Posted on: Dec 10 2007, 05:47 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
I owned one from June 07 to last week (only just sold it on eBay) to run some Mac-only software. I also had the intention of replacing my ancient PC and reduce my carbon footprint (Mac Mini power consumption = 23 W/Hr versus 72 W/Hr (idle) for the PC). However, the more I used the Mac, the more I found fault with the OS. In other words, matters of personal preference can be deal-breakers, and I would strongly recommend that you try out Mac OS X before buying... |
| Forum: Chit Chat · Post Preview: #105437 · Replies: 20 · Views: 17286 |
| Posted on: Dec 6 2007, 02:55 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Ah, memories. http://web.archive.org/web/19970605230559/...//www.nasa.gov/ The NASA HQ portal 10 years ago. How it has changed! Loved the patterned background; reminds me of my first website (made using Microsoft FrontPage (ugh)) back in 1998. |
| Forum: Chit Chat · Post Preview: #105134 · Replies: 3 · Views: 4838 |
| Posted on: Dec 6 2007, 02:41 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
It seems pretty slick to me but could be problematic for those on dial-up connections. It might also be problematic for those with slow computers. |
| Forum: Chit Chat · Post Preview: #105132 · Replies: 3 · Views: 4838 |
| Posted on: Dec 4 2007, 03:27 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
The Lyot Project coronagraph to be installed at Palomar: http://planetquest.jpl.nasa.gov/news/lyotNews.cfm |
| Forum: Telescopic Observations · Post Preview: #105024 · Replies: 26 · Views: 25212 |
| Posted on: Dec 3 2007, 01:46 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
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| Forum: Telescopic Observations · Post Preview: #104959 · Replies: 6 · Views: 7855 |
| Posted on: Nov 28 2007, 04:24 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
The flyby mission description is now up. 1,300 km altitude, southern hemisphere, outbound. ISS and VIMS will observe Ontario Lacus. |
| Forum: Titan · Post Preview: #104707 · Replies: 21 · Views: 18935 |
| Posted on: Nov 27 2007, 05:34 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
CRISM captures Phobos and Deimos: http://crism.jhuapl.edu/gallery/featuredIm...amp;image_id=98 QUOTE These CRISM measurements are the first spectral measurements to resolve the disk of Deimos, and the first of this part of Phobos to cover the full wavelength range needed to assess the presence of iron-, water-, and carbon-containing minerals. Looks like the page has a broken image; the image is here. |
| Forum: MRO 2005 · Post Preview: #104673 · Replies: 86 · Views: 164706 |
| Posted on: Nov 22 2007, 11:20 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
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| Forum: Jupiter · Post Preview: #104458 · Replies: 304 · Views: 223647 |
| Posted on: Nov 20 2007, 10:02 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Speaking of young planetary systems and Spitzer: http://www.spitzer.caltech.edu/Media/relea...8/release.shtml QUOTE Gorlova and her colleagues looked for the dusty signs of similar smash-ups around 400 stars that are all about 30 million years old - roughly the age of our sun when Earth's moon formed. They found that only 1 out of the 400 stars is immersed in the telltale dust. Taking into consideration the amount of time the dust should stick around, and the age range at which moon-forming collisions can occur, the scientists then calculated the probability of a solar system making a moon like Earth's to be at most 5 to 10 percent. |
| Forum: Telescopic Observations · Post Preview: #104326 · Replies: 4 · Views: 5768 |
| Posted on: Nov 19 2007, 05:09 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Regarding frozen orbits, I couldn't find the original paper, but here's an article that is derived from it. |
| Forum: Lunar Exploration · Post Preview: #104178 · Replies: 502 · Views: 634783 |
| Posted on: Nov 19 2007, 12:46 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
You simply need to design a vehicle that will do an orbit trim maneuver or two every orbit. Just a 1/2 km tweek... just keep it circular within a small amount. I remember reading an AIAA paper that suggested "frozen orbits" exist at low altitude, with a caveat that the orbit's inclination matters significantly. It concluded that at certain inclinations (27º, 50º, 76º, and 86º) it is possible for a spacecraft to remain in a low-lunar orbit indefinitely, without OTMs. |
| Forum: Lunar Exploration · Post Preview: #104155 · Replies: 502 · Views: 634783 |
| Posted on: Nov 16 2007, 10:59 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Would a modified version of LEMUR be up to the job? |
| Forum: Past and Future · Post Preview: #104057 · Replies: 34 · Views: 38073 |
| Posted on: Nov 15 2007, 01:08 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Yes, sorry I wasn't clearer. W = Watt-hours per sol. |
| Forum: Spirit · Post Preview: #103949 · Replies: 429 · Views: 278369 |
| Posted on: Nov 14 2007, 11:51 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Since the heaters cut in last winter there is a high probability that they will do so again. Anyone have any knowledge as to the power draw for these heaters? According to the MER thermal design document at JPL's reference archive, the MiniTES survival heater would consume 55 W on a cold night. Of course, Spirit could opt to use Deep Sleep to avoid survival heater usage at night. During the day, the WEB survival heaters use 60 W, so you'd want to avoid those from kicking in by running the computer for longer periods, as was done on Oppy. |
| Forum: Spirit · Post Preview: #103945 · Replies: 429 · Views: 278369 |
| Posted on: Nov 14 2007, 11:21 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
As for array deployment problems, I don't think it is a good apples to apples comparison to bring up the ISS troubles. Those arrays are huge, and involve a huge number of folds. Hubble's SA1 arrays were much smaller than the ISS arrays, yet the astronauts had to toss one overboard when it failed to retract... |
| Forum: Juno · Post Preview: #103943 · Replies: 597 · Views: 607294 |
| Posted on: Nov 14 2007, 09:32 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
The mission flyby description is now up. 1,000 km altitude, southern hemisphere, high-phase angle inbound (Titan backlit by the Sun). |
| Forum: Titan · Post Preview: #103934 · Replies: 6 · Views: 7161 |
| Posted on: Nov 13 2007, 11:23 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
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| Forum: Cometary and Asteroid Missions · Post Preview: #103835 · Replies: 65 · Views: 65211 |
| Posted on: Nov 12 2007, 10:11 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
There may still be unfired pyro valves in the propulsion system, which are used to isolate or pressurize parts of the system. |
| Forum: Voyager and Pioneer · Post Preview: #103746 · Replies: 3 · Views: 9666 |
| Posted on: Nov 12 2007, 09:31 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
I had seen the thread, but didn't advance enough in reading it to notice the transmission curves of the Galileo. On the internet, I read that the Galileo SSI is really a modified Voyager camera with similar filters. Only the telescope and filters are similar. Galileo used a CCD in contrast to Voyager's videcon tube. |
| Forum: Venus · Post Preview: #103743 · Replies: 5 · Views: 11531 |
| Posted on: Nov 12 2007, 04:33 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Goddard have unveiled a new antenna farm at White Sands that will support LRO: http://www.nasa.gov/centers/goddard/news/t...07/ka-band.html The antennas use glue instead of bolts! The future of the DSN? |
| Forum: LRO & LCROSS · Post Preview: #103704 · Replies: 175 · Views: 266749 |
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