M22 is the biggest globular cluster visible
from European latitudes. It's richer and brighter of M13, the big cluster
of Hercules. The biggest and brightest cluster of the sky is Omega Centauri
(NGC5139) that because of the low declination (-47°) is better visible
from Southern hemisphere.
|
Technical Data
|
| Optics |
Pentax 75 apochromatic
refractor |
| Focal Lenght |
500 mm |
| Focal Ratio |
f/6,7 |
| Exposure Time |
25 min exposure |
| Film |
Kodak E200 |
| Developement sensibility |
320 ISO |
| Location |
Capanne di Cosola (AL,
on the Appenninus, Italy) at 1500m |
| Date and time of exposure
start |
15 may 2002, 1.49 UT |
| Mount |
Gemini G41 |
| Tracking |
ST4 |
| Temperature and humidity |
T=+10°C, RH=53% |
| Notes |
Enlargement of the slide |
