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This mosaic show how M42 and Horsehead are near, two of the nicest objects in the sky. The nebulas that form M42 and IC434 (on which Horsehead proiect) are both at the same distance from us, of about 1600 a.l.. The dark nebula B33 is instead at about 1300 a.l., so 300 a.l. in front of the nebula.
See also:
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| Optics | Pentax 75 apocromatic refractor, 75mm diameter |
| Focal Lenght | 500 mm |
| Focal Ratio | f/6,7 |
| Exposure Time | Horsehead: 35 min exposure
M42: compositation of 35 and 40 min exposure |
| Film | Kodak E200 |
| Developement sensibility | 320 ISO |
| Location | Pian dell'Armà (PV, Italian Appennines), at 1400m |
| Date and time of exposure start | Horsehead: 11 january
2002, 23.07 UT
M42: 11 january 2002, 22.26 UT and 12 january 2002, 22.08 UT |
| Mount | Meade 8" |
| Tracking | ST4 |
| Temperature and humidity | 11 january: T=-5°C,
RH=90%
12 january: T=-4°C, RH=40% |
| Notes | - |
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