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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Sun - 31.5.2023 at 11.00 Turku, Nummenmäki Observation number 116460

Visibility II / V

Petrus Kurppa, Turun Ursa

The owner of the weather was quite fussy about good sunny weather, so I took what was available. Seeing was really bad, when the granulation that was previously well visible was now really on the cards. I somehow got to see it in one picture. There are now plenty of active areas in the area of the sun's disc, and new ones are already emerging from behind the edge. Full disc with 80mm lens tube, close-ups with 152mm telescope tube. Really small stacks were a way to get data out despite the weather, most of the close-up photos are stacks of only 15 photos. Too many days have passed with apparently good seeing, when now this kind of atmospheric slime porridge came quite unexpectedly.

The internet is full of useful sites to help the sunspot exhausted enthusiast, if the number of the active area, the different classifications of the sunspot and the possible probabilities of an outburst cannot immediately come to mind, which is handy information when planning hydrogen alpha animations. Here is one more link to remember.

Additional information
  • Observation target
    • Sun
  • Seeing
    • Bad
Technical information

Full lens: TS Optics 80mm, f/7, Lunt 1.25" solar prism. Baader Solar Continuum 1.25" 540nm, Baader Hyperion Zoom Barlow 2.25x, Player One Saturn-M

Close-ups: TS Optics 152mm f/5.9, Lacerta 2" solar prism, polarizing filter, Televue Powermate Barlow 5x, Baader Hyperion Zoom Barlow 2.25x, Player One Apollo-M Max

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