It is currently Wed Oct 23, 2019 9:50 pm


Post new topic Reply to topic  [ 5 posts ] 
Author Message
PostPosted: Fri Mar 04, 2011 11:45 am 
Offline

Joined: Mon Jan 09, 2006 11:05 am
Posts: 5275
Location: Lancashire
A composite of our satellite, courtesy of the LRO: http://apod.nasa.gov/apod/ap110303.html .

_________________
brian


Top
 Profile Send private message  
 
 Post subject:
PostPosted: Sat Mar 05, 2011 9:26 am 
Offline

Joined: Mon Jan 09, 2006 11:05 am
Posts: 5275
Location: Lancashire
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.

_________________
brian


Top
 Profile Send private message  
 
 Post subject:
PostPosted: Mon Mar 07, 2011 7:37 pm 
Offline

Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3547
Location: Wellingborough
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,

_________________
Brian
52.3N 0.6W
Wellingborough UK.

254mm LX90 on Superwedge, WO ZS66SD, Helios 102mm f5 on EQ1, Hunter 11x80, Pentax 10x50
ASI120MC Toucam Pros 740k/840k/900nc mono, Pentax K110D
Ro-Ro roof shed


Top
 Profile Send private message  
 
 Post subject:
PostPosted: Mon Mar 07, 2011 7:59 pm 
Offline

Joined: Mon Jan 18, 2010 9:25 am
Posts: 5298
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.


Top
 Profile Send private message  
 
 Post subject:
PostPosted: Tue Mar 08, 2011 10:54 am 
Offline

Joined: Mon Jan 09, 2006 11:05 am
Posts: 5275
Location: Lancashire
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.

_________________
brian


Top
 Profile Send private message  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group