My Assistant
| Posted on: Jul 30 2008, 09:54 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Just out of curiosity ... does the JPL have backup mission control centers somewhere in the US? I don't believe they do, but it sounds like all mission teams have a contingency plan for earthquakes. Here's the Cassini plan (extract taken from the Cassini website in 1999): QUOTE A Major Earthquake in California. Yes, we even have plans for this goblin! If a major earthquake were to strike, communication lines between JPL and the remote Deep Space Network, which we use to communicate to the spacecraft, might be broken for hours to possibly days. And with a probability of about 2 percent per year of a "major" earthquake, we'd better be ready for it if it happens. Our strength in this area is Cassini's distributed network, with scientists planning observations all over the country. The spacecraft sequence files, not to mention the science observations, will be stored in more than one location. Of course, after an earthquake we'd have to make sure our operations team can get somewhere secure to continue to plan spacecraft events, but with sequences being 28 days long, it's likely we'll have some time to recover and get a team to develop the next 28-day sequence before the current sequence ends. |
| Forum: Chit Chat · Post Preview: #121814 · Replies: 310 · Views: 232117 |
| Posted on: Jul 27 2008, 04:20 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
I think this is what we find at Tau Bootis. Although tau Bootes is a likely candidate for magnetic interaction, it doesn't appear to be obvious in observations. It is suspected that the low relative velocity between the star and planet would not induce an appreciable current. |
| Forum: Telescopic Observations · Post Preview: #121546 · Replies: 181 · Views: 179740 |
| Posted on: Jul 27 2008, 04:02 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
[EDIT: I meant magnetic effects, like Io's effect on Jupiter's magnetic field.] The planet could well be inside the Alfven radius (the region where Alfven waves would transport large amounts of energy along field lines). Star-planet magnetic interaction would be seen as chromospheric enhancement, and such has been observed for HD 179949. COROT could answer this question itself by following-up the discovery with chromospheric observations. |
| Forum: Telescopic Observations · Post Preview: #121543 · Replies: 181 · Views: 179740 |
| Posted on: Jul 26 2008, 09:55 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Nick, I have the same question. At first I thought it was a broadcast model where one user updates many others. But reading a recent Cassini report suggested it was more like an instant-messaging service ("For Cassini, the user submits a question or message and members of the flight team respond from the perspective of the spacecraft.") Even more confused now... |
| Forum: New Horizons · Post Preview: #121501 · Replies: 211 · Views: 277816 |
| Posted on: Jul 25 2008, 04:50 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
HD 17156b: a transiting planet with a 21.2-day period and an eccentric orbit Another ESA 'first' that really isn't? I'd say it was badly worded. It is, after all, the longest period for any transiting exoplanet ever found via the transit technique. There are other transits with longer periods (such as the one you reference) but all of those were first found by radial velocity searches, and then analyzed for transit solutions. |
| Forum: Telescopic Observations · Post Preview: #121400 · Replies: 181 · Views: 179740 |
| Posted on: Jul 8 2008, 01:56 AM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Some surprising detail brought out there--it looks to me like there are small clouds casting shadows on the surface. Can that be right? They could be little hills I suppose. They look like puffy water-ice clouds; here's a similar image from Icaria Planum. |
| Forum: Mars · Post Preview: #120124 · Replies: 13 · Views: 14293 |
| Posted on: Jul 7 2008, 12:00 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
|
| Forum: Phoenix · Post Preview: #120078 · Replies: 133 · Views: 136965 |
| Posted on: Jul 6 2008, 09:47 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Yup, it's a great shame that the UNEX program was canned. Perhaps cheaper access to space (I gather NanoSail-D and Presat are getting a ride on SpaceX's Falcon 1) will cause NASA to reconsider a UNEX-like program. Quick geek factoid: CHIPSat was the first satellite to use TCP/IP for communication with Earth. |
| Forum: Telescopic Observations · Post Preview: #120049 · Replies: 2 · Views: 4109 |
| Posted on: Jul 5 2008, 06:52 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
QUOTE Earth-like planets? |
| Forum: Telescopic Observations · Post Preview: #120006 · Replies: 10 · Views: 14878 |
| Posted on: Jul 2 2008, 04:20 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
SOFIA's primary mirror receives coating; ready for installation. http://www.sofia.usra.edu/News/news_2008/06_20_08/index.html |
| Forum: Telescopic Observations · Post Preview: #119788 · Replies: 16 · Views: 23270 |
| Posted on: Jul 1 2008, 05:04 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
|
| Forum: Cassini general discussion and science results · Post Preview: #119715 · Replies: 3 · Views: 6692 |
| Posted on: Jul 1 2008, 05:01 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
|
| Forum: Dawn · Post Preview: #119714 · Replies: 285 · Views: 337413 |
| Posted on: Jul 1 2008, 04:56 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
No decent Hubble Space Telescope images exist of 2 Pallas do they, or have I not been able to find them? Depends what you mean by "decent." |
| Forum: Dawn · Post Preview: #119713 · Replies: 285 · Views: 337413 |
| Posted on: Jun 24 2008, 10:09 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
...but I've heard nothing about the second two, going up to 1000 degrees. Did the other problems lead to them being cancelled? My guess would be that the science team is waiting to be allowed to use the Flash memory again (real soon now) before reading-out such important data (which you wouldn't want to trust to the vagaries of volatile memory). |
| Forum: Phoenix · Post Preview: #119121 · Replies: 405 · Views: 222837 |
| Posted on: Jun 22 2008, 04:32 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Then we find a population of bodies that does *not* fall neatly into that ecliptic plane. What is the most natural conclusion to be drawn from that? The conclusion I draw is that the accretion disk had ceased to be a flat disk by the time we got out that far from the sun. Lack of tidal forces and all that. Er, not quite. You need a lot of energy to escape the ecliptic plane. Those high-inclination bodies are known as "scattered-disk" objects -- they were most likely formed in the ecliptic plane but were gravitationally tossed into such odd orbits by Neptune. QUOTE Just as the farther-out shell of cometary debris, the Oort cloud, has. Likewise, those objects are believed to have been put there by Jupiter and Saturn... |
| Forum: Pluto / KBO · Post Preview: #118917 · Replies: 58 · Views: 84375 |
| Posted on: Jun 20 2008, 01:05 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
I wonder why a greater percentage of images than usual are suffering from data loss in transit. Is this a Phoenix, Odyssey, MRO, or DSN problem? Due to the Flash anomaly, they've added extra UHF passes. Perhaps some of these extra passes are less than optimal (low elevation etc.). |
| Forum: Phoenix · Post Preview: #118668 · Replies: 355 · Views: 224003 |
| Posted on: Jun 16 2008, 11:49 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
This ESO release suggests that 1-in-3 Sun-like stars have such super-Earths, so there are a lot more to come. Exciting times indeed. |
| Forum: Telescopic Observations · Post Preview: #118372 · Replies: 10 · Views: 9427 |
| Posted on: Jun 12 2008, 01:42 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
|
| Forum: Phoenix · Post Preview: #117929 · Replies: 207 · Views: 134528 |
| Posted on: Jun 11 2008, 03:19 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
That's the Organic-Free Blank. |
| Forum: Phoenix · Post Preview: #117814 · Replies: 207 · Views: 134528 |
| Posted on: Jun 9 2008, 09:34 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
They also mention that it has a "black hole." Perhaps they need to increase the Schwarzschild radius to allow particles to pass into the oven? |
| Forum: Phoenix · Post Preview: #117643 · Replies: 207 · Views: 134528 |
| Posted on: Jun 7 2008, 04:09 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
The anisotropy of the anisotropy. Alternatively, it's interesting that the coldest and hottest spots in the CMB correspond to the Milky Way's plane, so perhaps the aniostropy merely comes from dust extinction... |
| Forum: Telescopic Observations · Post Preview: #117354 · Replies: 1 · Views: 3764 |
| Posted on: Jun 5 2008, 08:20 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
|
| Forum: Earth Observations · Post Preview: #117151 · Replies: 1 · Views: 5697 |
| Posted on: May 28 2008, 04:16 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
However I have chucked the results on the web if it is any help to anyone: http://www.nivnac.co.uk/phoenix/raws/ Forget Rob Manning -- you're my new hero! |
| Forum: Phoenix · Post Preview: #115935 · Replies: 42 · Views: 45582 |
| Posted on: May 21 2008, 08:06 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Speaking of "The Sky at Night," is there any way to get BBC-America to start running it? I appreciate being able to watch Torchwood and Dr. Who on BBC-A, but it would be great if we could get TSAN to us Americans, too! Are you able to watch online on this page (I understand the BBC does sometimes block IP addresses that originate outside the UK)? Another way to get it would be to buy the accompanying magazine, which has a cover CD containing the full TV episodes in MPEG-1 format. |
| Forum: Phoenix · Post Preview: #114182 · Replies: 38 · Views: 30070 |
| Posted on: May 19 2008, 10:00 PM | |
![]() Member ![]() ![]() ![]() Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
Under contract from NASA, Rochester Institute of Technology is developing an imaging LIDAR for planetary mapping. Swaths of entire scenes with an accuracy of 1 cm?! Sweet! |
| Forum: Mars · Post Preview: #113975 · Replies: 4 · Views: 7512 |
New Replies No New Replies Hot Topic (New) Hot Topic (No New) |
Poll (New) Poll (No New) Locked Topic Moved Topic |
|
Lo-Fi Version | Time is now: 17th December 2024 - 02:23 AM |
|
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
|