Thursday, January 15, 2009

Periodic error of a mount

The periodic error of a mount (=>yellow arrow) has been measured here using the software PEMPro. The zacks are due to atmospheric turbulences (bad seeing). A Philips ToUCam at a focal length of 2415mm has been used for this test. The resolution of this configuration was 0,48 arcsec per pixel.

Let's have a look at the histogram. An asymmetrical histogram points at physical problems, but that's not the case here: