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Science Forum Index » Space - History Forum » Phoenix Lander from oribt!!!!!...
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 Posted: Tue May 27, 2008 9:16 am |
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| Posted: Tue May 27, 2008 1:31 pm |
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On May 27, 7:19 pm, Pat Flannery <flan... at (no spam) daktel.com> wrote:>
Dr.Colon.Osc... at (no spam) gmail.com wrote:> > Well its time for perjoratives,
unbeleivable! You can see landing> > plume impingement on the surface
(looks like it came it from lower> > left, and what looks like the
heatsheild/impact area lower left)> > Yesssir..........Doc http://
www.nasa.gov/images/content/230826main_lander-topviewcolor-bro...> >
Did you see the crater shot yet?:http://hirise.lpl.arizona.edu/images/
2008/details/cut/PSP_008579_9020...> (article here:http://
hirise.lpl.arizona.edu/phoenix-descent.php)> That is a mighty good-
sized crater (it's around twenty kilometers beyond> where the lander
came down at, and is around 10 km in diameter). Should> have run a MER
into that thing's interior.> Has anyone collated the horizon glint
photo taken from the surface with> the backshield or parachute
position on the color photo you linked to?> Even minus the descent
photography from Phoenix itself, it sure didn't> take long for them to
locate it on the surface, did it?> > PatThe crater shot is one of the
most incredible shots I've seen in the history of exploration. Just,
just just.......... I'm not sure if they have ID'd the glint yet but
soon come, soon come. What I found is interesting is that in the
parachute pic the chute still looks reefed for what I recall is
supersonic flight. (looks like a inverted teardrop, certinaly not
domelike open condition) You can see this better in the higher
contrast version of the same shot. If thats the case they caught the
lander in the reefed condtion in a already small time window. What do
you think the surface disturbance of the area around the lander can
tell us about landing and surface makeup?.....................
WOOOOOHOOOOO...................Doc |
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| Pat Flannery... |
| Posted: Tue May 27, 2008 6:19 pm |
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Dr.Colon.Oscopy at (no spam) gmail.com wrote:
Did you see the crater shot yet?:
http://hirise.lpl.arizona.edu/images/2008/details/cut/PSP_008579_9020_cut.jpg
(article here: http://hirise.lpl.arizona.edu/phoenix-descent.php )
That is a mighty good-sized crater (it's around twenty kilometers beyond
where the lander came down at, and is around 10 km in diameter). Should
have run a MER into that thing's interior.
Has anyone collated the horizon glint photo taken from the surface with
the backshield or parachute position on the color photo you linked to?
Even minus the descent photography from Phoenix itself, it sure didn't
take long for them to locate it on the surface, did it?
Pat |
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| Pat Flannery... |
| Posted: Tue May 27, 2008 7:11 pm |
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Dr.Colon.Oscopy at (no spam) gmail.com wrote:
Quote: What do
you think the surface disturbance of the area around the lander can
tell us about landing and surface makeup?
Quite a bit; by knowing the atmospheric pressure at the landing site and
the exhaust velocity of the landing engines, you should be able to get a
pretty good guesstimate of the density of the surface material that got
stirred up, by how far it moved away from the lander.
Unfortunately, there's a downside to this...the area of discolored
surface is a lot further out than the sample arm can reach, so you won't
be getting pristine condition surface to sample, but rather surface
that's been contaminated by the landing engine exhaust, at least in its
uppermost surface. This was a concern on Viking also, and led to the use
of large numbers of clustered rocket nozzles (Phoenix uses 12). Really,
to get pristine samples, the airbag system would have been a better way
to go...but apparently it wasn't suitable for landing this particular
probe do to some weight or deceleration constraints.
There's data on the Viking soil contamination here:
http://books.nap.edu/openbook.php?record_id=11381&page=148
Pat |
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| Pat Flannery... |
| Posted: Tue May 27, 2008 7:44 pm |
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Dr.Colon.Oscopy at (no spam) gmail.com wrote:
Quote: just just.......... I'm not sure if they have ID'd the glint yet but
soon come, soon come.
This looks a _lot_ like the backshield:
http://fawkes4.lpl.arizona.edu/images.php?gID=509&cID=8
I wonder if that ridge in the distance is the rim of the crater in the
descent photo?
This is the first Mars terrain from any of the five landers that looks
very markedly different from the rest; this area may not be very
exciting to look at, but a rover would have a very easy time
transversing this terrain, as you could tell it to drive quite a
distance in any direction you wanted without worrying about it running
into (or falling off of) anything.
I think the rovers have spoiled me; I want Phoenix to go up the rim of
that big crater and peek into it. :-)
Pat |
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| Scott Hedrick... |
| Posted: Wed May 28, 2008 8:00 pm |
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"Pat Flannery" <flanner at (no spam) daktel.com> wrote in message
news:Ma6dnZibqviSNqHVnZ2dnUVZ_hqdnZ2d at (no spam) northdakotatelephone...
Quote: I think the rovers have spoiled me; I want Phoenix to go up the rim of
that big crater and peek into it. 
Well, if they hadn't released the pressurant, at the end of 90 days they
coulda cranked those nozzles up and shifted the thing- oh, at least a foot.
** Posted from http://www.teranews.com ** |
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| Jeff Findley... |
| Posted: Sat May 31, 2008 5:33 pm |
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"Scott Hedrick" <dinehnmNOSPAM at (no spam) yahoo.com> wrote in message
news:5265e$48405894$24785 at (no spam) news.teranews.com...
Quote:
"Jeff Findley" <jeff.findley at (no spam) ugs.nojunk.com> wrote in message
news:5c35c$48402d0f$927a2cda$25840 at (no spam) FUSE.NET...
"Scott Hedrick" <dinehnmNOSPAM at (no spam) yahoo.com> wrote in message
news:b7073$483f6591$2870 at (no spam) news.teranews.com...
"Pat Flannery" <flanner at (no spam) daktel.com> wrote in message
news:Ma6dnZibqviSNqHVnZ2dnUVZ_hqdnZ2d at (no spam) northdakotatelephone...
I think the rovers have spoiled me; I want Phoenix to go up the rim of
that big crater and peek into it. :-)
Well, if they hadn't released the pressurant, at the end of 90 days they
coulda cranked those nozzles up and shifted the thing- oh, at least a
foot.
You sure that the propellant will stay liquid in this case?
Frequent "clearing the nozzles" would help.
Actually, I'm talking about the propellant in the tanks. I'm not sure the
craft was designed to keep the tanks warm enough during the landing phase of
the flight to keep the propellant from freezing solid. You'd have to keep
the heaters powered and I'm sure power is at a premium during the landing
phase.
Jeff
--
A clever person solves a problem.
A wise person avoids it. -- Einstein |
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| Scott Hedrick... |
| Posted: Sat May 31, 2008 10:50 pm |
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"Jeff Findley" <jeff.findley at (no spam) ugs.nojunk.com> wrote in message
news:2983c$4841d1d7$927a2cda$22468 at (no spam) FUSE.NET...
Quote: Frequent "clearing the nozzles" would help.
Actually, I'm talking about the propellant in the tanks. I'm not sure the
craft was designed to keep the tanks warm enough during the landing phase
of the flight to keep the propellant from freezing solid.
If you keep bouncing the lander, the propellant will move enough to keep
from freezing.
Hard to get any science done that way, though.
** Posted from http://www.teranews.com ** |
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