Blanco 1 open cluster

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This very fant and disperse open cluster is 850 l.y. away in Sculptor. It was discovered only in 1949 by the astronomer Victor Manuel Blanco, whose name now is given to the 4 m telescope at Cerro Tololo.

Technical data
Optics Pentax 75 apo refractor
Focal Length 500 mm
Focal Ratio f/6.7
Exposure Time 1 h 10 min (single exp of 10 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Tivoli Farm (Namibia) at 1350 m height
30 August 2011
Mount Kenko NES
Tracking Lodestar with a small refractor (F.L. 100 mm, aperture 23 mm)
Temperature and humidity T= +11°C, RH=38%
Sky brightness at zenith (with SQM-L) 22.1 mag/arcsec^2 (a few hours before our record of 22.2 was reached)
Notes This image is a collaborative effort of the Namibia 2011 expedition. Processing: Lorenzo Comolli. Images by: Lorenzo Comolli, Luigi Fontana, Giosuè Ghioldi, Emmanuele Sordini.

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