Marko Posavec Photography

The Night Sky over Korenica

In the last weekend of June I attended an astrophotography workshop in Korenica, led by Boris Štromar from Zagreb. I learned a lot there, but I’m most happy about finally getting the AllView mount to work. The quality of tracking is what you would expect from an alt-azimuthal mount, but provided the alignment is precise it can still yield some nice results.

Waiting for the skies to get dark. This place is Korenica’s observatory under construction. Scorpius and Antares are rising in the left, Saturn is near the center, while Spica and Mars drift to the right.

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Cassiopeia (center left) and other northern constellations over Lička Plješivica mountain.

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First hints of the Milky Way, 22:19 local time (20:19 UTC). Also, here’s why ISO 1600 is next to unusable on my camera.

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This image of the Summer Triangle is an ad-hoc stack of four images. It could have been much better, but I was so happy surfing the sky with AllView that I completely neglected acquiring proper frames for stacking. Four lights, no darks nor flats, poorly aligned (not to mention different exposure times, varying between 2 and 3 minutes). All of that contributed to enhanced field rotation as well. Still, for a first attempt, I don’t think it’s that bad. Stacked with DeepSkyStacker, processed with PixInsight and Photoshop. Move your mouse over the image to see a labeled version.

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As we mingle around our scopes and cameras, the core of the galaxy drifts through Korenica’s light pollution in the south. This is a single, 64-second frame.

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It was not long, however, before moisture went sky-high and low mist started rolling around. Time to call it a night.

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One more view of Lička Plješivica the other day. This is one of its highest peaks, Gola Plješivica, 1.646 m (5400 ft) high. The mountain is famous for Željava Air Base hidden inside it.

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