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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Sun - 4.6.2017 at 12.20 - 4.6.2017 at 14.33 Espoo Observation number 64346

Visibility II / V

Tommi Ropponen, Ursa (Etelä-Suomi)

The goal was to have a longer shooting session when the weather was right. I filmed the interval 12:20 - 14:33 until the batteries started to run low on batteries. There was that one spot in the sun, but nothing really happened in that couple of hours. The protut, on the other hand, were quite comfortable.

The still image is stacked from a video started at 2:33 pm and features the earth approximately on a scale (the image of the earth is free-to-use images from Nassa’s Apollo era). The animation, on the other hand, consists of the entire time slot and contains 17 separate frames that are looped. There is a colored and black and white animation of the same processing set and a colored version of a slightly different kind of stretching.

Unfortunately, most obviously, the optical axis moves slightly as the tube turns, so the flats taken at the beginning and end of the imaging set didn’t bite just about every shot as desired, and Newton’s rings are clearly visible in some frames. I need to be more specific with the focus lock if I could even eliminate that phenomenon next time. The still image is the last image of the session and the flats taken immediately afterwards correct the the image fits well, so there is a strong suspicion of a slight dip in the optical axis.


Additional information
  • Observation target
    • Sun
    • Heikosti näkyvä
Technical information

For each image, a 5,000-frame video was captured, of which the best 5% is stacked. Equipped with D-ERF, 80/480 apo, Quark, 0.5x shortener, 30 mm spacing and ASI 178MM.

Comments: 1 pcs
Emma Bruus - 26.2.2019 at 16.22 Report this

Nämä animaatiot auringosta ovat kyllä todella upeita!

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