Observation by Dr Alan B Thomas: Sunspot 2738 by projection

Uploaded by

Alan Thomas

Observer

Dr Alan B Thomas

Observed

2019 Apr 09 - 12:49

Uploaded

2019 Apr 09 - 15:30

Objects

The Sun

Equipment

200mm Dob stopped to 50mm
32mm Plossl
Sony DSC-RX100
Projection screen

Exposure

ISO 125, f/5.6, 1/500 sec.

Location

My home in Cheshire

Target name

Sunspot 2738

Title

Sunspot 2738 by projection

About this image

After a seemingly long period of solar sunspot inactivity, I noticed via SolarHam that sunspot 2738 is visible and managed to obtain this image.

I'm sure that it must be possible to obtain higher-quality images using projection; one difficulty is not being able to precisely align the camera with the projection surface (a problem which does not occur with the back-projection solar funnel) although this does not seem apparent in the image I obtained today. But there are other issues . . .

I am contemplating building a projection box as described by Bob Oseman in his article 'A Cardboard Solar Projection Box' to see if this yields better images. However, I have a variety of 'technical' queries about solar projection which I could perhaps best pose via a Forum post.

Files associated with this observation

DSC00780 (903x1024).jpg (423.4 kB)

Like this image

Jeremy Shears, Andy Wilson, Andrew Dumbleton

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