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Mars in IR with 642nm filter versus in focus Aldeberan

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About this observation
Observer
Martin Lewis
Time of observation
10/04/2019 - 19:32
Object
Mars
Observing location
St Albans
Equipment
444mm Dobsonian
ASI290MM
642nm filter IR
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Here is a comparison at the same image scale of Mars and nearby Aldebaran with my 444mm scope using an Astronomiks 642nm filter for both. Interesting to compare the size of the details on the surface with the size of the Airy disc of the star.

Mars was 4.5" across and Airy disc (dia of first dark ring) should be about 0.8" and Dawes limit about 0.33".

Martin

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