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 Post subject: Orion
PostPosted: Thu Jan 16, 2020 1:19 pm 
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Joined: Sun Oct 25, 2009 3:56 pm
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Location: Caithness
Just a quick stack of five 5-20 sec exposures of Orion taken with a modded Canon 1000D and 55mm lens then colour balanced in Photoshop.

Image

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 Post subject: Re: Orion
PostPosted: Thu Jan 16, 2020 5:30 pm 
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Location: Wellingborough
Betelguese still looks marginally brighter than Bellatrix (+1.6m) in your image Brian. So about +1.4m?. Mind you SkyMapPro gives the "normal" range for Betelgeuse as 0.0 to +1.3 so is it really unusually dim at this time? :)

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 Post subject: Re: Orion
PostPosted: Thu Jan 16, 2020 10:26 pm 
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Maybe a modded camera lets in more red light, so Betelgeuse may be fainter with an unmodded camera?

What interests me about the Orion photo is whether it is distortion free and measurements can be taken for star separations.

Usually macro lenses are needed, but modern cameras apply corrections in camera so I am never sure how accurate the images are.

55mm lenses are generally older but this one may be modern?

Also my Betelgeuse estimates are in polluted skies so may not be as accurate as I would like.

Regards,
David


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 Post subject: Re: Orion
PostPosted: Fri Jan 17, 2020 2:49 pm 
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Location: Caithness
Quote:
Maybe a modded camera lets in more red light, so Betelgeuse may be fainter with an unmodded camera?


David this is exactly what I was thinking. It makes a pretty picture but I don't think it can be seriously used for magnitude estimates. Neither is it distortion free, particularly in the outer parts of the field. Betelgeuse looked much fainter with the unaided eye. I don't think Bellatrix is a particular good comparison star either as it is a blue star. Maybe Aldebaran and Procyon? Personally I would estimate around +1.5 for Betelgeuse, but I'm by no means experienced in this.

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BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/


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 Post subject: Re: Orion
PostPosted: Sat Jan 18, 2020 4:32 am 
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Location: New Farnley, Leeds lat 53.8N long 1.6W
Hello All,
If you are using Bellatrix as a comparison star for visual estimates, it is best to compare rapidly by taking quick glimpses at either star alternately and try to keep the (imaginary) line joining your eyes parallel to a line from Betelgeuse to Bellatrix. This helps to reduce physiological bias.
Bob


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 Post subject: Re: Orion
PostPosted: Sat Jan 18, 2020 1:33 pm 
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I think we! are being far too critical here, it is a great shot with a camera not £000's of pounds of top end gear

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 Post subject: Re: Orion
PostPosted: Mon Jan 20, 2020 10:18 am 
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Location: Lancashire
Agreed Skyhawk. It's a beautiful portrait of Orion.

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 Post subject: Re: Orion
PostPosted: Tue Jan 21, 2020 6:31 pm 
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Joined: Sun Oct 25, 2009 3:56 pm
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Location: Caithness
Thanks everyone for the replies, though I didn't take it as criticism, rather a discussion about the efficacy of the image as regards magnitude estimates. I never really intended it for that, although it was bound to come with all the excitement around Betelgeuse just now.
Personally I would be flabbergasted if it did blow... :lol:

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BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/


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