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Venus from Ground Based radar and other
belleraphon1
post Mar 10 2015, 11:50 AM
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Image Release: Venus, If You Will, as Seen in Radar with the GBT
https://public.nrao.edu/news/pressreleases/venus-surface-gbt

Impressive.

May be awhile before we return to Venus. Perhaps we need a ground based forum for the time being.

Craig
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4throck
post Mar 10 2015, 04:50 PM
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Interesting indeed.
I wonder if some technique could be used to remove the double image effect?


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JRehling
post Mar 10 2015, 05:25 PM
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QUOTE (4throck @ Mar 10 2015, 09:50 AM) *
I wonder if some technique could be used to remove the double image effect?


I believe a third transmitter/receiver would definitively solve that problem, but good luck getting a massive radar facility funded for the sole purpose of improving maps of Venus.
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Gerald
post Mar 10 2015, 06:36 PM
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A cross-eyed version:
Attached Image

(derived from B. Campbell, Smithsonian, et al., NRAO/AUI/NSF, Arecibo)
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belleraphon1
post Mar 10 2015, 07:51 PM
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Did not mean to give short shrift to Akatsuki mission.
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Phil Stooke
post Mar 10 2015, 08:45 PM
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A third transmitter would help, as suggested, but also the same method applied at a different inferior conjunction will have the Doppler equator (the dark band) in a different location, and all the reflection effects correspondingly moved. By comparing images of different dates the ambiguity can be removed.

There is a long history of radar imaging of Venus, going back 50 years. This is by far the best single image - the bistatic method works really well - but there are many others made monostatically at Goldstone and Arecibo. The brief comments about past work in the press release don't do the subject justice. Anyhoo... there is a good basis for comparison to look for fresh lava flows or other changes. Incidentally, some past results were much higher resolution than this, so I would hope that the image we have is significantly downsampled from the real data.

Phil



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belleraphon1
post Mar 10 2015, 10:09 PM
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Phil...

Thanks for the comment. I had no idea ground based radar had gotten this good. When I saw the image it just blew me away.
Bodes well for long term monitoring.

Seeing the Venera images from Ted Stryk's blog http://planetimages.blogspot.ca/2015/03/ve...hy-we-need.html
just brought back to me how little we know about our sister world. At 62 years old wonder how much more we will know in my lifetime.

Craig
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ngunn
post Mar 10 2015, 10:32 PM
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QUOTE (belleraphon1 @ Mar 10 2015, 10:09 PM) *
When I saw the image it just blew me away.

Me too. I've not seen the radar data presented so well before, so it's a real revelation for us non-experts.

At 62 years old wonder how much more we will know in my lifetime.

Me too again. A lot I hope.
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belleraphon1
post Mar 10 2015, 11:23 PM
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Yeah ngunn

Blessed to have lived through the years from 1962 (Mariner 2) on... what a time. Now there are all those hot super-terrestrial exoplanets discovered
(sorry, really dislike the term SuperEarth. These are nothing like Earth). Venus can teach us so much.

Ok, done preaching, lol.

Craig
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vjkane
post Mar 11 2015, 07:42 PM
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Has anyone seen what the resolution was for this Earth-based observation?


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Phil Stooke
post Mar 19 2015, 05:17 AM
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I have not seen the resolution for this image, but check out this page:

http://www.naic.edu/~pradar/radarpage.html

for some images from 1999 - 2001 including a small one at 1.2 km/pixel.

Also you can poke around here... some at least are 50 pixels/degree or about 2 km.

http://pds-geosciences.wustl.edu/premgn/mg...bvenus/arecibo/



Phil


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