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

Ursa Astronomical Association

Starscape image - 29.8.2021 at 22.40 Tampere Observation number 100837

Visibility III / V

Pekka Rautajoki, Tampereen Ursa

The 51 on the Bongaa 100 list, Algol, is a changing star, and I first tried to spot Algol at its dimmest. With Sky & Telescope’s Algol minimum counter, I got some possible dates for August-September, when Algol would shine dimmer than normal at this time of night, and on August 29, it wilted. Algol’s minimum was, according to Sky & Telescope, comfortably around eleven o’clock in the clear evening sky. I had previously noticed, in observing asses, that Algol, who shines with normal brightness, is quite close to the brightness of the Almach star in Andromeda. During the minimum, Algol was clearly dimmer than Almach. In the pair of drawings in the picture on the right, the dimmed Algol (with blue dashes), the reference star Almach with yellow dashes. Also the next evening 30.8. was bright, so at the same time I made a second drawing to compare Algol’s normal brightness (left drawing of a pair of images). #bongaa100



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  • Observation target
    • Starscape image
  • Constellation
    • Perseus
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Daler & Rowney black paper, Derwent pens

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