APOD: 1901 Photograph: The Orion Nebula (2019 Aug 17)

Comments and questions about the APOD on the main view screen.
L. McNish
Posts: 5
Joined: Fri Feb 11, 2005 1:27 am
AKA: The Grumpy Old Astronomer
Location: Calgary, Alberta, Canada

Re: APOD: 1901 Photograph: The Orion Nebula (2019 Aug 17)

Post by L. McNish » Fri Sep 20, 2019 2:40 am

I also compared the 1901 image of Orion to one of my recent ones.
Full details at: https://calgary.rasc.ca/orion_star_movement.htm

I found:

9 stars (circled in red) that had moved more than any others (the "brighter" star image is the position in 2019, and the "darker" is from 1901)

1 very red star (circled in green) that was almost invisible in the 1901 image since "the original glass photographic plate was sensitive to green and blue wavelengths"

1 star (circled in blue) that was clearly visible in my 2019 image but not in the 1901 image

1 star (circled in magenta) that was clearly visible in the 1901 image but not in my 2019 image

If the latter two items are indeed the same star, then it's motion over the last 118 years is truly significant.
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