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Orion Nebula OSP 2005

Scope: Orion 8" F4 Dob
Mount: Orion SkyView Pro

M51 50x30s exposure with Meade DSI

Scope: Orion 8" F4 Dob
Mount: Orion EQ-G

M53 with Meade DSI

Scope: Orion 8" F4 Dob
Mount: Orion EQ-G

M94 50x30s exposure with Meade DSI

Scope: Orion 8" F4 Dob
Mount: Orion EQ-G

M109 30x120s exposure with Meade DSI - a real stretch

Scope: Orion 8" F4 Dob
Mount: Orion EQ-G

M81 30x60s exposure with Meade DSI - 

Scope: Orion 80mm ED
Mount: Orion EQ-G
Processing: Meade AutoStar

Equipment

Periodic Error of the Orion EQ-G mount

Here is a stack of photos taken over a 50 minute period. The long trails are due to errors polar alignment. The vertical drift is about 100 pixels or about 5 arc-min of drift. The side to side drift is 4 to 5 pixels or about 12 - 15 arc-sec. Each pixel is about 3 arc-seconds.

Periodic error ~ 12-15 arc-seconds

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