No luck detecting the outer ring using my 12" SCT under very good conditions in 2011 (179x / 27'):
A small, round patch, brighter in a round central part (clear without using AV), using AV the...
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No luck detecting the outer ring using my 12" SCT under very good conditions in 2011 (179x / 27'):
A small, round patch, brighter in a round central part (clear without using AV), using AV the...