Wednesday, January 21, 2009

Nothing but stars around Alpha Tauri

Admire the rich star fields around Aldebaran as they could be visually observed through a very big amateur telescope. Several faint stars with an apparent magnitude of 15m and a beautiful star chain are visible in the photo above. (RA=04:33:00, DEC=16°27')
At the upper side of the photo the galaxy IC374 is clearly visible. It has an apparent magnitude of 16.16mag and a size of 0.1'x0.1'. It is small, faint and it has a much brighter middle.

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:

Sunday, January 11, 2009

Saturn 2009 has no rings, hasn't it?

This photo has been taken under bad seeing conditions. Anyway, you see Saturn rings are almost absent (we see them at an angle of at approx. 1°).

Dancing stars due to bad local seeing

Saturn this month

This is the ring planet Saturn on January, 10th 2009 at 23:55 GMT