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NGC 147 -185 (Andromeda Galaxy's satellites)

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Situated in the constellation of Cassiopea, near the border toward Andromeda, they are only 7° north of the great Andromeda Galaxy M31. The measurement of distance give us a value of 2.2 millions of light years: so they are galaxies gravitationally connected with M31, in other words satellite galaxies. The distance from M31 is about 250.000 l.y.
 

Technical Data
Optics	Pentax 75 apochromatic refractor
Focal Lenght	500 mm
Focal Ratio	f/6,7
Exposure Time	45 min
Film	Kodak E200
Developement sensibility	320 ISO
Location	Capanne di Cosola (AL, on the Appennines, Italy) at 1500m
Date and time of exposure start	26 october 2003, 0.24 UT
Mount	Gemini G41
Tracking	ST4
Temperature and humidity	T=-5°C, RH=46%
Notes	-

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