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LAMO, aka Low Altitude Mapping Orbit
dilo
post Nov 11 2011, 10:23 PM
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I think is time to start this new topic, now that Dawn is more than half-way in the transition from HAMO to LAMO (as showed in the plot below).

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Attached Image
 


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ElkGroveDan
post Nov 11 2011, 11:53 PM
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Good thing we aren't calling it a "Low Mapping Altitude Orbit." wink.gif

I get the feeling that many more surprises await us in finer detail as the surface resolution improves.


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dilo
post Nov 14 2011, 04:08 PM
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Another way to show the progress from HAMO to LAMO is the following updated plot where points colors reflects engine status:
Attached Image

I tried to interpolate average height with a blue line. Time gaps are due in part to me (not continuous monitor) and in part to Mystic simulator black-outs.

EDIT: plot updated to Nov,15


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dilo
post Nov 16 2011, 08:49 PM
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And finally, we are below 300km height... not far from final target! rolleyes.gif
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Phil Stooke
post Nov 16 2011, 08:59 PM
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Hopefully the daily image releases will resume shortly!

Phil



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stevesliva
post Nov 16 2011, 09:54 PM
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QUOTE (Phil Stooke @ Nov 16 2011, 04:59 PM) *
Hopefully the daily image releases will resume shortly!


You mean images rather than other data products? Or images specifically from LAMO?

Pace hasn't slackened... now here:
http://dawn.jpl.nasa.gov/multimedia/imageo...h=2011-November

Last two were HAMO images, though.
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Tunglere
post Nov 16 2011, 11:47 PM
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Images from Nov. 10-13 don't currently show up on the Dawn Image of the Day page (November), but they do show up on Photojournal.
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Phil Stooke
post Nov 17 2011, 04:15 PM
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The latest four images were posted on the same day... I check every day, believe me. We had a minibreak. But these are spectacular!

Phil


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dilo
post Nov 17 2011, 10:20 PM
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Updated situation, all plots:
Attached Image
Attached Image

Engines are now silent and average height is around 270 km...


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dilo
post Nov 18 2011, 05:20 PM
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Now that we have an improved simulator (better Vesta digital model and, especially, more frequent screen updates) I am frequently monitoring the simulated height of the probe; in the last 24 hours, engines were off but orbit isn't completely stable:
Attached Image

The interpolated sinusoidal curve correspond to a 5.1 hours average period between 235 and 285 km height. The reason of slight phase/amplitude variations sould be the irregular gravity field of Vesta. In fact, as explained in the last Mission Status, the purpose of these thrust stops is a natural or passive orbit adjustment (especially the orientation).

Edit: slightly modified previous text and updated plot (no orbit decay)


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dilo
post Nov 23 2011, 08:41 PM
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New update after two long simulator black-outs:
Attached Image

Based on today's status report, "The spacecraft thrusts occasionally with its ion propulsion system, but most of the time it coasts, letting Vesta's gravity reorient its orbit."
Note also that last two published images were taken 15 days ago from an intermediate distance of 480km:
http://dawn.jpl.nasa.gov/multimedia/imageo...p?date=20111123 http://dawn.jpl.nasa.gov/multimedia/imageo...p?date=20111122


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dilo
post Nov 25 2011, 10:52 PM
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Further update:
Attached Image

Dawn is almost there!


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dilo
post Nov 29 2011, 10:05 PM
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Now short engine burns are frequent:
Attached Image


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Phil Stooke
post Nov 29 2011, 11:54 PM
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"Dawn image EDR data will be publicly released to the science community by the PDS within 90 days after each acquisition phase. Therefore, raw Vesta approach images will be available in November 2011. Raw images for other acquisition phases including survey, high altitude (HAMO) and low altitude (LAMO) mapping orbits will be delivered throughout 2012"

"However, radiometrically calibrated PDS images (RDRs) will be publicly released six months after Vesta departure"

... from Jeffery Anderson's AGU poster abstract.

Exciting!

Phil


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elakdawalla
post Nov 30 2011, 02:34 AM
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ohmy.gif ohmy.gif ohmy.gif Time for us to lurk on the Small Bodies Node website.....that is where they'll likely be hosted, right?


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