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Cocoon
Nebula IC 5146 (500mm)
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The Cocoon Nebula is positioned at the
end of the dark nebula Pistol (B 168), like a projectile! The star field
is 12° E of Deneb of Cygnus, and is very rich in stars of the Milky
Way. Visible also the open cluster NGC 7209 on the prolongation of the
dark nebula, in the lower-left angle.
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Technical Data
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| Optics |
Pentax 75 apochromatic
refractor |
| Focal Lenght |
500 mm |
| Focal Ratio |
f/6,7 |
| Exposure Time |
45 min exposure |
| Film |
Kodak E200 |
| Developement sensibility |
320 ISO |
| Location |
Capanne di Cosola (AL,
in the Appennines, Italy) at 1500m |
| Date and time of exposure
start |
20 september 2003, 20.28
UT |
| Mount |
Gemini G41 |
| Tracking |
ST4 |
| Temperature and humidity |
T=+12°C, RH=76% |
| Notes |
- |
