Dawn Cruise |
Dawn Cruise |
Jun 30 2008, 11:11 AM
Post
#61
|
|
Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
...Dr. Rayman is a hoot! He sure can write an entertaining update.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
|
|
|
Jun 30 2008, 12:10 PM
Post
#62
|
|
Member Group: Members Posts: 753 Joined: 23-October 04 From: Greensboro, NC USA Member No.: 103 |
He is indeed quite an entertaining writer.
Maybe during the relatively quiet years of the cruise phase, ESA could contract out to him to write mission updates of the probes they purportedly have deployed around the solar system. -------------------- Jonathan Ward
Manning the LCC at http://www.apollolaunchcontrol.com |
|
|
Jun 30 2008, 12:41 PM
Post
#63
|
|
Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
...Dr. Rayman is a hoot! He sure can write an entertaining update. A joke or two can be funny, but not one or two in every paragraph. It's hard to tell sometimes what's serious and what's not. Also, for my tastes, very little of his humor is actually funny. --Greg |
|
|
Jun 30 2008, 12:48 PM
Post
#64
|
|
Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Also, for my tastes, very little of his humor is actually funny. Sadly, this is often the case for me as well which is a shame because it distracts from otherwise detailed status reports he makes. -------------------- |
|
|
Jun 30 2008, 01:01 PM
Post
#65
|
|
Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
He sounds like a typical slightly nutty scientist type.........
|
|
|
Jun 30 2008, 01:11 PM
Post
#66
|
|
Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
See this...
---------------------- That's a line being drawn under the debate regarding Marc's writing. Some like it. Some don't. End of debate. |
|
|
Jul 1 2008, 10:30 AM
Post
#67
|
|
Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
I'm just pleased that we get regular updates on the mission.
The possible post-main mission rendezvous with Pallas hasn't been mentioned for a while, but IIRC the mechanics of setting it up are difficult due to Pallas' orbit being appreciably out of ecliptic. Maybe the mission planners are going to present the relevant trajectories as a fait accompli when they're lobbying for that mission extension... |
|
|
Jul 1 2008, 03:42 PM
Post
#68
|
|
Junior Member Group: Members Posts: 47 Joined: 27-June 08 From: Ashford, Kent, United Kingdom. Member No.: 4244 |
I'm just pleased that we get regular updates on the mission. The possible post-main mission rendezvous with Pallas hasn't been mentioned for a while, but IIRC the mechanics of setting it up are difficult due to Pallas' orbit being appreciably out of ecliptic. Maybe the mission planners are going to present the relevant trajectories as a fait accompli when they're lobbying for that mission extension... I hope so. In December 2018, 2 Palles is on the descending node. In fact DAWN would not even have to leave the plane of 1 Cere's orbit to do this, as 2 Pallas will intersect that plane. The biggest issues will be the supply of Xenon, & the state of the solar arrays, will they still be producing enough power? I really, really hope that the 2 Pallas option stays open. To bag all three of the Asteroid Belt's largest members would be a real accomplishment. However 2 Pallas would not be orbited, but could be a slow encounter, enabling much of the giant asteroid to be seen at a fairly high resolution. Whilst 4 Vesta & 1 Ceres are primary mission aims, I think to not lose sight of 2 Pallas as an encore right at the very end, would be worthwhile. No decent Hubble Space Telescope images exist of 2 Pallas do they, or have I not been able to find them? Andrew Brown. -------------------- "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.
|
|
|
Jul 1 2008, 04:55 PM
Post
#69
|
|
Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
No decent Hubble Space Telescope images exist of 2 Pallas do they, or have I not been able to find them? from http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2502.pdf "Figure 1: Pallas imaged by HST in 336nm UV filter." -------------------- If Occam had heard my theory, things would be very different now.
|
|
|
Jul 1 2008, 04:56 PM
Post
#70
|
|
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." I don't recall seeing any press release images of Pallas from STScI, but there is a set of WFPC2 images in the MAST archive. Looks like they were taken using gyro-guiding, and so the targeting was a little off... -------------------- "I got a call from NASA Headquarters wanting a color picture of Venus. I said, “What color would you like it?” - Laurance R. Doyle, former JPL image processing guy
|
|
|
Jul 1 2008, 05:01 PM
Post
#71
|
|
Member Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
|
|
|
Jul 1 2008, 06:47 PM
Post
#72
|
|
Junior Member Group: Members Posts: 47 Joined: 27-June 08 From: Ashford, Kent, United Kingdom. Member No.: 4244 |
from http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2502.pdf "Figure 1: Pallas imaged by HST in 336nm UV filter." Thank you very much Dan, I tried, high & low to find HST imagery of 2 Pallas. I had heard before that the triaxial shape had been determined from rotational light curves. That is a very good image & quite clearly shows a rounded triangular profile, the best I've ever seen of this gigantic asteroid. I've downloaded the image. Depends what you mean by "decent." I don't recall seeing any press release images of Pallas from STScI, but there is a set of WFPC2 images in the MAST archive. Looks like they were taken using gyro-guiding, and so the targeting was a little off... Thank you very much Del also for your help. The scientific case for DAWN to go onto 2 Pallas after the end of the primary mission is compelling. It's great to be back here, hopefully I can contribute something of interest at some point. Andrew Brown. -------------------- "I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before". Linda Morabito on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.
|
|
|
Jul 3 2008, 06:21 PM
Post
#73
|
|
Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
This is another Hubble view. During the 2001 observations, the Hubble missed Pallas with its Planetary Camera chip, getting the image with its lower-resolution wide field portion of WFPC2.
-------------------- |
|
|
Aug 27 2008, 02:00 PM
Post
#74
|
|
Member Group: Members Posts: 213 Joined: 21-January 07 From: Wigan, England Member No.: 1638 |
|
|
|
Aug 27 2008, 03:35 PM
Post
#75
|
|
Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
Hmmm. He raises the point that Dawn will cross Mars' orbit before the gravitational assist but doesn't seem to explain why. Obviously this happens with Venus gravitational assists, but that's unavoidable. I'm trying to think why it would be better to do the assist from the far side of Mars, but I can't think of any -- other than the question-begging one of "it wouldn't work the other way".
Does anyone know? --Greg |
|
|
Lo-Fi Version | Time is now: 4th May 2024 - 02:46 PM |
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. |