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Phobos
cndwrld
post Jul 1 2011, 10:18 AM
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Phobos & Jupiter in Conjunction

Sorry if this was covered somewhere else, but I didn't see it mentioned here. A couple weeks ago, ESA published a new Phobos fly-by video.

You can see it at:
http://www.esa.int/esaSC/SEMHGWD1XOG_index_0.html

It shows Phobos in conjunction with Jupiter. Includes a Phobos image in 3D.


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Paolo
post Sep 28 2012, 05:05 PM
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there isn't a thread for Deimos, so I will post here this interesting paper just published (free of charge if registered):
New astrometric observations of Deimos with the SRC on Mars Express
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cndwrld
post Oct 1 2012, 09:36 AM
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The official ESA web release about the improved Deimos orbit determination done by MEX is here.


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SteveM
post Oct 1 2012, 07:43 PM
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The Astronomy and Astrophysics paper on the Deimos measurements is here.
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JohnVV
post Oct 1 2012, 09:11 PM
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naif update
ftp://naif.jpl.nasa.gov/pub/naif/generic_...r085_deimos.txt
ftp://naif.jpl.nasa.gov/pub/naif/generic_...r085_phobos.txt
mar097.bsp
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Paolo
post Dec 24 2013, 04:24 PM
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first image from the 22 December flyby
http://blogs.esa.int/mex/2013/12/24/merry-...m-mars-express/
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Astro0
post Dec 25 2013, 06:28 AM
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Worth noting that that entry on the ESA Mars Express blog actually refers back to UMSF. smile.gif

From Daniel Scuka's blog entry: "Looking for a challenge? Let us know where on Phobos you think this image is located (there's a cool 'map' of Phobos over at UnmannedSpaceflight.com)."

Daniel Scuka is Senior Editor for Spacecraft Operations at ESOC, ESA's European Space Operations Centre, Darmstadt, Germany.
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scalbers
post Dec 28 2013, 07:49 PM
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Phobos animation using a shape model...

http://spaceinvideos.esa.int/Videos/2013/12/Phobos_360


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JohnVV
post Dec 29 2013, 01:41 AM
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the "phobos_ver512q.tab" mesh from
VO1_SA_VISA_VISB_5_PHOBOSSHAPE_V1_0.zip
from the pds small bodies node

displays in Blender


it basically is a .obj mesh
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bobik
post Nov 2 2022, 12:18 PM
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As is mentioned in an ESA web release about the recent close flyby of Phobos by Mars Express, "[t]he orbit of Mars Express has been fine-tuned to get us as close to Phobos as possible during a handful of flybys between 2023 and 2025". A quick WebGeocalc search gives five flyby opportunities with a distance to the surface of less than 100 km during this period:

Date ............ Distance to surface [km]

2023-07-21 ... 52

2024-01-09 ... 55
2024-05-30 ... 62
2024-11-15 ... 45

2025-09-16 ... 40

So mark your calendar and let's hope Mars Express isn't switched off by then.
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Bill Harris
post Nov 2 2022, 05:52 PM
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Looking forward to those close flybys. I'm especially wanting images from close flybys of the blue-white toned and the ochre toned areas on Phobos. As well as another, closer pass with the MARSIS instrument.

https://www.esa.int/ESA_Multimedia/Images/2...rface_of_Phobos
Attached thumbnail(s)
Attached Image
 


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Explorer1
post Nov 2 2022, 07:22 PM
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Mars Express certainly needs to continue. MMX's planners would certainly be grateful for more data.

Since Exomars is being delayed for so long, there's surely a small amount of money in the ESA budget, right? Extended missions are generally much cheaper to run than a primary mission, with the smaller teams and efficiency/experience of those still working on it.
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djellison
post Nov 2 2022, 08:23 PM
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QUOTE (Explorer1 @ Nov 2 2022, 11:22 AM) *
Since Exomars is being delayed for so long, there's surely a small amount of money in the ESA budget, right? Extended missions are generally much cheaper to run than a primary mission, with the smaller teams and efficiency/experience of those still working on it.


Having a mission be delayed usually means it's going to cost MORE money.

https://www.bbc.com/news/science-environment-63336201

In this case "up to €360m"

That said - I would be very surprised if ESA couldn't find the relatively modest budget to keep MEX going until the spacecraft is no longer functional.
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Explorer1
post Nov 3 2022, 03:00 AM
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In the long term yes, but that would all be spread out over the next 8-10 years. Since these Phobos flybys are in the next 2 years, the costs of the primary Exomars mission would be being spent right now if not for the delay.
The peak cost is the period before and during a primary mission, from what I read in NASA budgets (like the charts and tables here which show a sort of bell curve and a long 'tail' of minimal expenses for extended missions). I'm assuming the logic works the same with ESA missions.
Sorry to get a bit into the weeds on this, but there should be no excused to cancel scientifically significant flybys of a very interesting object!
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djellison
post Nov 3 2022, 03:23 PM
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QUOTE (Explorer1 @ Nov 2 2022, 07:00 PM) *
The peak cost is the period before and during a primary mission


Spacecraft get cheaper once you launch them.

Look at New Horizons, MSL, OSIRIS REX, Juno etc in the amazing TPS Google Doc.

The moment you launch them - the cost plummets by a factor of about 4+

The two years of prime mission for MSL averaged ~$80M
The six years before that averaged >$300M.

Put another way - the ExoMars rover is going to be more expensive now than when it's actually operating. It's going to be more expensive over the next 5 years than had it launched on time and was operating in the same time frame.

But again - I agree - the cost of operating MEX is in the weeds compared to the new costs for ExoMars. I fully expect MEX to keep going. Remember - we've had the same "The budget goes to zero in a year" for many other Mars missions that have carried on for year and years thereafter as the budget was found. MSL, Odyssey, MER...all saw similar fiscal outlooks at certain points.

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