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Ursa Astronomical Association
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00130 Helsinki

Ursa Astronomical Association

3122 Florence - 1.9.2017 at 23.57 - 2.9.2017 at 02.16 Orimattila, Artjärvi, Tähtikallio Observation number 66644

Visibility III / V

Veikko Mäkelä, Ursa (Helsinki)

We came to Tähtikallio for the weekend and the Friday / Sat night was still relatively clear, so the observation program has a description of the asteroid 3122 Florence. The destination was already relatively high on the border between the Little Horse and the Dolphin.

The subject appeared confusingly well in the images and it was fun to follow when with only 5 and 8 s exposures, the subject moved clearly between each image.

I took pictures of the subject in three different star fields, about 7 min, 54 min, and 28 min. The longest latter series is depicted in groups of 30 and two 100 images. The intervals between these appear as small breaks in the line.

The weather was perhaps not the best, and in the final series part of the time, apparently as the cloud flew across the area, there were so few stars in the images that DeepSkyStacker refused to stack those witches.

The images would be up to animation and photometry, but you have to learn a little bit to make it work.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 3122 Florence
    • Keskitaso
Technical information

Alluna RC16, C415 / 3320, SBIG 1001E, filter L, stacked: DeepSkyStacker
23.57-0.04, 30 x 8 s
at 0.08-1.02, 230 x 8 s
0.08-1.02, 230 x 8 s (animation)
1.48-2.16, 150 x 5 s

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