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Showing posts from March, 2021

Nice halo display

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 Today, there was a nice halo display.  The 22-degree halo was easy to see, but not very bright.  No sundogs or other atmospheric phenomena were visible. 22-degree halo.  Canon EOS 80D, with 14mm Sigma F2.8 lens 22-degree halo.  Canon EOS 80D, with 14mm Sigma F2.8 lens

Mirror certificate of Optical Quality

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 I found my certificates for my 18'' mirror back.  I put them here as a reference.

Observing nights beginning of March 2021

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The winter was not very good for observing.  In December, there were a few good nights, but at that time, my telescope was not accessible because we were rebuilding our veranda.  In February, there were a few good nights, but it was so cold outside, that I could not force myself to go outside.  Finally, in March, there were two clear nights with no moon-light. It were two quite cold nights.  On March 5, the temperature dropped from 0.0 (69%) to -2.3 (82%).  On March 6, the temperature dropped from 0.7 (73%) to -1.3 (85%).  No wind. The sky was not very dark.  The SQM value only was 19.83 at best (on the first night).  The second night, the SQM was only 19.73 at best. The first night, Sara and Lotte joined me during the first part of the observations.  We observed Mars, M 45, M 35, M 36 and M 42 together.  Mars is too small again to see real detail on it.  I could also observe Uranus, as a green-blue, but small dot.  I observed Thor’s Helmet, but without a filter, the object was very fa

Conjunction of Mars and the Pleiades

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On March 2, 2021, there was a nice conjunction of Mars and the pleiades.  I took some pictures using my Canon EOS R, using my RF 28-70mm f/2 lens.  The picture also show the Hyades star cluster.  An overview picture also show the constellation of Orion together with the conjunction.