The Pinwheel Galaxy in Triangulus is a
typical example of spiral galaxy. It isn't an easy object because of it's
low superficial brightness. With M31 and the Milky Way constitute the bigger
part of the Local Group, the galaxy cluster in which we are.
Very interesting is the presence of many
red-coloured regions, they are giant H-II regions, where star forms. The
bigger of thise regions is catalogued as NGC 604, it's at 10' NE of the
nucleus, and have a diameter of about 1000 a.l. and a spectrum very similar
to that of M42. This central regions are better visible in the zoom below.
|
Technical Data
|
| Optics |
Pentax 75 apocromatic
refractor, 75mm diameter |
| Focal Lenght |
500 mm |
| Focal Ratio |
f/6,7 |
| Exposure Time |
65 min exposure |
| Film |
Kodak E200 |
| Developement sensibility |
320 ISO |
| Location |
Colle del Nivolet (AO,
in the Italian Alps), at 2600m |
| Date and time of exposure
start |
5 ottobre 2002, 0.33
UT |
| Mount |
Gemini G-41 |
| Tracking |
ST4 |
| Temperature and humidity |
T=-1°C, RH=96% |
| Notes |
- |
