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Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Sun - 24.5.2022 at 11.00 Espoo Observation number 106948

Visibility IV / V


Such a fine loop was visible in the Sun. I first wondered which blob is far from the surface of the Sun, then by extending the exposure time, the whole loop appeared. After all, that’s pretty big compared to the size of the Sun. In the pictures, the Sun is completely overexposed, and the ‘shadow’ near the edge of the Sun can be a reflection in the telescope (?) That appears in long exposures.

When shooting the surface of the sun, the appropriate exposure time was 0.0015 seconds, while in these images the time was 0.1 second, or about 67 times longer.

The two images are otherwise the same, but the splashes in the black-and-white image are a little better.

The telescope was a Lunt LS50THa, accompanied by a 2X Barlow with an effective effect of about 1.3X. The image is thus taken in the light of H-alpha radiation from hydrogen.


Additional information
  • Observation target
    • Sun
Comments: 3 pcs
Timo Alanko - 26.5.2022 at 11.27 Report this

Hyvin sait yksityiskohtia esiin. Itse ole kuvaillut järkkärillä 60-millisen läpi, eikä noin skarppia ole tullut. Mitä kameraa käytät?

Kimmo Lehtinen - 27.5.2022 at 11.06 Report this

Kamera on ZWO ASI120MM-S. Kuva on tehty pinoamalla noin 100 kuvasta, ja sen jälkeen terävöitetty.

Tästä tapahtumasta opin sen että protuberanssien kuvaamisessa kannattaa kokeilla myös reilusti pidempää valotusaikaa kuin yleensä niiden kuvaamisessa. Saattaa löytyä tällaisia himmeämpiä kohteita.

Tämä luuppi muutti muotoaan varsin nopeasti. Harmi etten ottanut siitä 'time lapse' videota eli intervallivideota.

Tapio Lahtinen - 27.5.2022 at 18.08 Report this

Onpa hieno luuppi.

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