Archive for August 22, 2019

M11 – Open Cluster in Scutum – Observer’s Challenge Object – August 2019

August 22, 2019

Complete report: AUGUST 2019 OBSERVERS CHALLENGE – M-011-1

The following pencil sketch, with the colors inverted was made using a 6-inch f/6 Newtonian reflector telescope @ 83x.  

Rogers M-011 Inverted

Image by Mario Motta: 32-inch telescope 

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Image by Michael Brown using a Canon digital SLR camera, through an 8-inch Celestron SCT.  This photo is from 12 30-second exposures (6 minutes total) at ISO 3200.

M11b

The following image was taken with a 10-inch f/6.9 Newtonian with the same camera. The exposure was 30 minutes. Most of the stars in the image belong to the cluster, perhaps 500-1000 visible here. The faintest stars in the image are magnitude 16!    James Dire

M11

Stock Canon 80D, 400mm f/2.8 lens, ISO 800, 35subs x 30sec = 17.5 min total
exposure, 1/2 scale (4 arcsec/pixel).  No filters.  By Doug Paul 

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