VdB 99 and Pi Sco

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VdB 99 is a very faint blue reflection nebula, illuminated by Pi Scorpi. VdB 99 is also known as Sharpless 1 (Sh2-1) and include LBN1095. The upper part is named GN 15.50.6 and include many other nebulas such as LBN 1093, LBN 1092, Ced 125a+b+c+d.
This field is very interesting due to the colour contrasts between the pure blue at right, the greenish blue above and the faint red around Pi Sco.
Technical data
Optics Pentax 75 apo refractor
Focal Length 500 mm
Focal Ratio f/6.7
Exposure Time 3h (single exp of 10 min)
CCD Canon EOS 5D with Baader filter
Sensitivity 800 ISO
Location Tivoli Farm (Namibia) at 1350 m height
Date
 1 September 2011
Mount Kenko NES
Tracking Lodestar with a small refractor (F.L. 100 mm, aperture 23 mm)
Temperature and humidity T= +11°C, RH=22%
Sky brightness at zenith (with SQM-L) 21.5 mag/arcsec^2 (MW at zenith)
Notes Moon hight in the sky!!!
North nearly at left.
This image is a collaborative effort of the Namibia 2011 expedition. Processing: Lorenzo Comolli. Images by: Lorenzo Comolli, Luigi Fontana, Giosuè Ghioldi, Emmanuele Sordini.

HTML Editing and Publishing by Lorenzo Comolli. Email me at comolli@libero.it.
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