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Fw: [ap-gto] large donut in Ha image
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david w pearson
anyone have any experience with large Donut in image as to where is it is occurring? have included animation to show strange intensity variability and with features within the donut. ----- Forwarded Message ----To: main@ap-gto.groups.io <main@ap-gto.groups.io> Sent: Sunday, January 30, 2022, 06:29:52 PM PST Subject: Re: Re: [ap-gto] large donut in Ha image TPO RC-12, SBIG STF-8300m with filter wheel w 37mm filters, AP 0.67x reducer, shooting at 1700mm, off axis guider, AP1200 mount on permanent pier group observatory, 10 min consecutive ha subs animation link
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Andrea Lucchetti
When I had this issue was due to a bright star slightly off the sensor field. Very common in Orion region. I saw the same with apo and newton, of course the shape changes because of central obstruction. Andrea
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