Wondering how Mars looks like through a telescope?
A few days ago, on January 30, 2023, I captured Mars using a webcam (SPC900NC) attached to the Westerlund 90cm Telescope in Uppsala, Sweden. The focal length in the Nasmyth focus is 9 meter. The pixel size of the camera (5.6μm) thus leads to a pixel scale of ...
Finally! Comet C/2022 E3 (ZTF)
After desperately waiting for two weeks in a row, the weather here in Uppsala finally improved and we could observe the famous comet C/2022 E3 (ZTF) with our rooftop telescope at the Angström Laboratory, the so called "Westerlund Telescope". As the comet just ...
Long-term trends of light pollution
I am happy to announce that our paper on long-term trends in light pollution has been recently published in Monthly Notices of the Royal Astronomical Society. In the paper we present long-term (4–10 yr) trends of light pollution observed at 26 locations, ...
Dreht bitte jemand das Licht ab? Folgen der Lichtverschmutzung
Für alle die nicht live bei meinem "Astronomy on Tap" Vortrag in Bonn am 28. Juni dabei waren, gibt es hier ein Video der Veranstaltung (Minute 6:40 bis 35:00) und weiter unten die Folien meiner Präsentation. Es geht um Lichtverschmutzung: Was ist Lichtverschmutzung, ...
Improving the periodic error and guiding ability of a Losmandy GM8 mount
Why bothering about improving Losmandy's GM8 mount Fig. 1: Losmandy GM8 guide star drift while auto-guiding. Overall the mount produces round star images and guiding works. However, the guide star drifts are relatively large (compared to seeing). As mentioned ...
Using an MGEN v2 Autoguider on a Losmandy mount with 492 Digital Drive System
Why I bought a Losmandy GM8 mount Figure 1: Analysis of guide star positions when using the MGEN autoguider on a Skywatcher EQ5 Pro mount. The green circles indicate the offsets in arcsec of the guide star in RA, while blue diamonds show the offsets in DEC. The ...
