Technical Data
|
Optics |
TEC 140
|
Focal Length
|
1011 mm
|
Focal
Ratio |
f/7.2
|
Exposure
Time |
Total 8 h 30 min, composed of Ha-RGB 390:40:30:50 min
(single exp of 30 min for Ha and 10 min for RGB) |
CCD |
SBIG STL-11000M @-35°C and @-30°C
|
Location |
Saint Barthelemy football field (AO, Italian Alps) at 1600 m heigth
|
Date
|
22-23 September 2017 (2 nights)
|
Mount |
Gemini
G-41
|
Tracking |
Lodestar
on an 80mm f/5 refractor
|
Temperature
and
humidity |
T= (+4 to +6) °C, RH=(75 to 100) %
|
Sky brightness at
zenith (with SQM-L) |
(21.1 to 21.3) mag/arcsec^2
|
Notes |
Faint
veils in the first night when I captured H-alpha; the second night was
nearly completely clouded, and I had to fight to get a few RGB
exposures. North toward up-right.
|