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Subject: Telescope Drive Drift
From: matt longmire
Reply To: mapug@shore.net
Date: Fri Apr 07 00:31:08 1995

Just a quick question regarding telescope drift, in light of the recent discussions.

If telescope drives are crystal controlled (as most are these days) how does a 2 arc-second drift per minute, when compared to the sidereal rate of 15 arc-seconds per second, which is roughly 1 part in 500, represent "well within spec"? One would think you would get drift accuracy on the order of the crystal frequency error/stability which is much better than 1 part in 500.

What did I miss?

Matt Longmire mattlong@rain.org Santa Barbara Instrument Group