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Lunar Reconnaisance Orbiter's Moon ..

Posted: Fri Mar 04, 2011 11:45 am
by brian livesey
A composite of our satellite, courtesy of the LRO: http://apod.nasa.gov/apod/ap110303.html .

Posted: Sat Mar 05, 2011 9:26 am
by brian livesey
Sharp as this picture is, the resolution is only as much as I can see in my SKYWATCHER 70mm refractor.
It goes to show how much lunar detail can be resolved even with a small 'scope.

Posted: Mon Mar 07, 2011 7:37 pm
by Brian
Dear Brian,

do you refer to the APOD image, or to the 549MB high-resolution image from the LRO site? At 145m/pixel, I thought the resolution would take some beating,

Regards,

Posted: Mon Mar 07, 2011 7:59 pm
by David Frydman
The moon from memory is about 2160miles across.
Say an average size of 30arc minutes equals 1 arc minute for 72 statute miles. Which is about unaided eye best resolution.
1 arcsecond equals 1.2milse.
If we are talking black spots on light background or white spots on black background a 70mm scope might resolve about 1.5 miles or say 2.5km.
for a wall or linear feature a width of 250 metres might be seen with a long wall with say a dark shadow.

So it depends how the 145 metres per pixel is defined.
For a white or dark spot on high contrast background much more detail should be visible in the high resolution photo than with a 70mm scope, and even the best amateur digital photographers would struggle to achieve that wit say an 11 inch scope.
However if the high resolution photo doesn't do better than 145metres for a straight wall, although a 70mm might not compete but i think a high quality 100mm or 120mm refractor or Maksutov might.

Regards, David.

Posted: Tue Mar 08, 2011 10:54 am
by brian livesey
The resolution I was referring to is what I see in the APOD as presented on the computer screen. It corresponds to the amount of detail I can see in the 70mm refractor.