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djellison
Posted on: Jan 16 2015, 04:00 PM


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Long before UMSF, there was a Beagle 2 Yahoo group I formed - just as a clearing house for info about a mission that was to be controlled just a few miles from where I lived at the time.

Frankly - MER was barely on my radar. When we never heard from Beagle...I was so disappointed - gutted beyond words. I'd even popped a good luck Christmas card under the door of Mission Control the night of landing.

To now know that it made it all the way to the ground is just astonishing. I was skeptical it had made it that far - especially with the absence of a parachute in MOC imagery ( turns out a MOC image in '04 was right over that spot...but the downlink got corrupted )

Without Beagle - there would have been no UMSF, and I wouldn't have ended up where I am today.

Wherever you are, Prof Pillinger..... thank you. You can be damned proud of what Britain did back in 2003.
  Forum: Mars Express & Beagle 2 · Post Preview: #217055 · Replies: 65 · Views: 164689

djellison
Posted on: Jan 15 2015, 01:07 AM


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QUOTE (Mithridates @ Jan 14 2015, 04:57 PM) *
I wonder.


I wouldn't. Images will show up when they show up. There's really very little point in try to guess when it'll happen.
  Forum: Dawn · Post Preview: #217000 · Replies: 756 · Views: 1721531

djellison
Posted on: Jan 14 2015, 11:33 PM


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QUOTE (Superstring @ Jan 14 2015, 02:55 PM) *
I don't recall that being the case for past missions


It was very much the case for Vesta approach. Dawn doesn't operate an image policy like MER, MSL and Cassini.
  Forum: Dawn · Post Preview: #216991 · Replies: 756 · Views: 1721531

djellison
Posted on: Jan 14 2015, 06:27 PM


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Discussion already started here : http://www.unmannedspaceflight.com/index.php?showtopic=7962
  Forum: Past and Future · Post Preview: #216981 · Replies: 61 · Views: 115190

djellison
Posted on: Jan 13 2015, 07:34 PM


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QUOTE (Mongo @ Jan 13 2015, 10:16 AM) *
pronunciation


I think the somewhat tongue in cheek pronunciation comment was regarding the inclusion or exclusion of the prefix 'dwarf'
  Forum: Chit Chat · Post Preview: #216949 · Replies: 123 · Views: 155291

djellison
Posted on: Jan 11 2015, 01:24 AM


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Nothing to do with institutional inertia.

Instruments of this complexity require lengthy lead times, and have significant and complex requirements of the vehicle.
  Forum: Perseverance- Mars 2020 Rover · Post Preview: #216897 · Replies: 343 · Views: 431531

djellison
Posted on: Jan 7 2015, 04:59 PM


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And for the past month or so - without the use of flash memory.

Extraordinary.
  Forum: Opportunity · Post Preview: #216815 · Replies: 127 · Views: 262406

djellison
Posted on: Dec 29 2014, 03:34 PM


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QUOTE (MahFL @ Dec 29 2014, 04:25 AM) *
Also of course you have several extra months of cruise time which has to be "manned" back on Earth, which also costs money.


That was the exact point I was making.
  Forum: Mars · Post Preview: #216647 · Replies: 5 · Views: 15641

djellison
Posted on: Dec 29 2014, 02:47 AM


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That's what I got from it as well....the definition of 'reach Mars' is somewhat limited in scope. The article says " the big burn to slow down and hit the Martian bull's-eye—as in the Hohmann scenario—is done away with" ... well, direct landings have no such burn, so there's no benefit there whatsoever.

Moreover "Although launch and cruise costs remain the same...." and "A straight shot with abrupt braking at Mars takes about six months whereas a trip relying on ballistic capture would take an additional several months" are at odds with one another.

MAVEN launched on the cheapest LV available - an Atlas V 401 which had more than enough performance to deliver MAVEN and the fuel for a 'traditional' MOI. Saving a few hundreds lbs of MOI fuel would have saved nothing in launch costs, and added costs for extended cruise operations. The same was basically true of MGS, MRO, MEX and Odyssey. Assuming a transition to a cheaper Falcon 9 for similarly sized missions in the future...it has even more performance to spare than the Atlas V 401.

Really not sure how applicable this is to anything but a very specific kind of mission...and one we've not actually needed yet.

  Forum: Mars · Post Preview: #216644 · Replies: 5 · Views: 15641

djellison
Posted on: Dec 19 2014, 06:05 PM


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There are at least two HiRISE images that cover the MPF lander - and one even got it in color ( and so is thus actually 3 images! )

  Forum: Past and Future · Post Preview: #216472 · Replies: 39 · Views: 122204

djellison
Posted on: Dec 16 2014, 07:36 PM


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QUOTE (mcgyver @ Dec 16 2014, 10:51 AM) *
What is actually odd is that ANYthing is visible after 17 years. :-)


The backshell and parachute as well as the landers are visible from both Viking missions, now 37 years old.

Your suggestion that the piece we see is the only piece tall enough to get dust blown off it....

http://photojournal.jpl.nasa.gov/jpeg/PIA02652.jpg

The piece of airbag to the -Y side of the -X petal is SIGNIFICANTLY larger and taller than the piece by the +Y petal.

The reason that one piece stands out in HiRISE is because of the metallic foil tangled up in that piece of airbag.

I believe a similar piece is tangled up off the end of the +X petal - but one would need to be observing at a different time of day to get a glint off that ( and due to orbital mechanics, that's unlikely ).

  Forum: Past and Future · Post Preview: #216365 · Replies: 39 · Views: 122204

djellison
Posted on: Dec 15 2014, 10:24 PM


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What I find odd in this is that you can not really see any evidence of the +x and -x petals and airbags. ( The rover was deployed from the +y petal, the ASI boom deployed on the +X petal. If you can't see the ASI boom or rover ramps - you're looking at the -X petal.)

  Forum: Past and Future · Post Preview: #216341 · Replies: 39 · Views: 122204

djellison
Posted on: Dec 14 2014, 06:43 AM


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QUOTE (Explorer1 @ Dec 13 2014, 11:05 AM) *
Huh, that's a tiny fraction of the tilt of Vesta and Ceres; its even smaller than Mars and Venus.


But it certainly is not 'exactly the same orbital plane as us'
  Forum: Dawn · Post Preview: #216286 · Replies: 68 · Views: 177158

djellison
Posted on: Dec 13 2014, 06:17 PM


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QUOTE (Mithridates @ Dec 13 2014, 08:33 AM) *
Inclination 0.7595°

So it orbits on exactly the same orbital plane as us. Very rare for an object of its type.


The Earth's orbital inclination is zero. Changing inclination to 0.76 degrees would require a delta V of about 0.4km/sec

  Forum: Dawn · Post Preview: #216274 · Replies: 68 · Views: 177158

djellison
Posted on: Dec 11 2014, 03:30 PM


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Even if there were one scheduled on the PSA - I'm afraid I wouldn't trust it. It'll show up when it shows up. If I saw anything on the PSA before the middle of next year - I would be pleasantly surprised.
  Forum: Rosetta · Post Preview: #216224 · Replies: 197 · Views: 319288

djellison
Posted on: Dec 10 2014, 06:12 PM


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QUOTE (jmknapp @ Dec 10 2014, 10:11 AM) *
Put another way, according to this theory, the very top of Mt. Sharp is lakebed sediment?


Yes.
  Forum: MSL · Post Preview: #216190 · Replies: 546 · Views: 439254

djellison
Posted on: Dec 10 2014, 05:24 AM


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QUOTE (Brian Lynch @ Dec 9 2014, 02:00 PM) *
Does anyone know if they have released each of the original OSIRIS images for the touchdown mosaic?


They have not. Honestly - I'm not expecting anything from OSIRIS apart from perhaps one Philae-on-the-ground image between now and the first PSA release in >6 months time.
  Forum: Rosetta · Post Preview: #216175 · Replies: 197 · Views: 319288

djellison
Posted on: Dec 9 2014, 10:46 PM


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QUOTE (serpens @ Dec 9 2014, 02:30 PM) *
Personally I feel that a dab of artistic licence to show a higher, less eroded crater rim and ejecta field would have provided a better feel for what it would have looked like.


Me to. But given the time I had to make it - that was never gonna happen.
  Forum: MSL · Post Preview: #216164 · Replies: 61 · Views: 76413

djellison
Posted on: Dec 8 2014, 10:57 PM


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It happens. Sometimes there are pipeline burps and old images appear. Not every image that appears in Exploratorium is 'new'

Only way to be sure is to check the site ID ( in that image it's 0000... currently Opportunity is at CJL1 )

Or take the file name and run it thru something like this : http://www.greuti.ch/oppy/html/filenames_ltst.htm
  Forum: Opportunity · Post Preview: #216130 · Replies: 593 · Views: 516287

djellison
Posted on: Dec 8 2014, 10:43 PM


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http://qt.exploratorium.edu/mars/opportunity/pancam/2004-01-25/1P128287268EFF0000P2303L2M1.JPG
  Forum: Opportunity · Post Preview: #216128 · Replies: 593 · Views: 516287

djellison
Posted on: Dec 8 2014, 10:04 PM


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That's an image from Sol 1. Landing day. It's airbag scrape marks in the dirt.

Look at the date on the URL. 2004-01-25
2004.

It's a single frame from this Mosaic
http://mars.nasa.gov/mer/gallery/press/opp...stcard_part.jpg

  Forum: Opportunity · Post Preview: #216125 · Replies: 593 · Views: 516287

djellison
Posted on: Dec 5 2014, 05:48 AM


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'Reliable as heck'

3800+ Sols into a 90 sol mission despite the harsh temperature cycles and radiation environment on Mars?

I would call that the epitome of 'Reliable as heck'
  Forum: Opportunity · Post Preview: #216047 · Replies: 593 · Views: 516287

djellison
Posted on: Dec 3 2014, 06:39 AM


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AOS
  Forum: Hayabusa2 · Post Preview: #215980 · Replies: 983 · Views: 963142

djellison
Posted on: Dec 3 2014, 05:20 AM


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24, 25, 45 and 34 are all waiting for Hayabusa 2

From what I can see in the extended details - they're all ready to listen at 8.426 Ghz (X-Band) with I think 16kbps downlink and and 34 & 45 ready to uplink at 15.6 bps.

(15 is currently getting data from GeoTail, 43 Rosetta and 35 MRO and Mars Odyssey - updates are every 5 seconds)
  Forum: Hayabusa2 · Post Preview: #215974 · Replies: 983 · Views: 963142

djellison
Posted on: Dec 3 2014, 05:07 AM


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DSN Now should have AOS later.... 4 antennas are ready and waiting for it

http://eyes.nasa.gov/dsn/dsn.html

  Forum: Hayabusa2 · Post Preview: #215972 · Replies: 983 · Views: 963142

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