ASTRO: NGC 2024, the Flame Nebula in Orion

I took this about a week ago. The image has a number of artifacts, including
a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt,
which is just outside the image. When I tried to reduce the impact I lost
part of the nebula. Also my 50mm focal reducer lens was not designed to work
with the OGS 20-inch. However working at around F/5 this image is 20x23 arc
minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue,
and luminance.

George Normandin

that's really nice George

you did a nice job on that across the board in my opinion

rdc

"George Normandin" wrote in message
...
I took this about a week ago. The image has a number of artifacts,
including a reflection from 2nd magnitude Alnitak, the eastern star in
Orion's belt, which is just outside the image. When I tried to reduce the
impact I lost part of the nebula. Also my 50mm focal reducer lens was not
designed to work with the OGS 20-inch. However working at around F/5 this
image is 20x23 arc minutes. The exposure was 10:5:10:10 minutes exposure in
red, green, blue, and luminance.

George Normandin

Very nice picture George. Actually the Flame would not be the same without
the artifacts of Alnitak, I think most pictures have them.

Stefan

"George Normandin" schrieb im Newsbeitrag
...
I took this about a week ago. The image has a number of artifacts,
including a reflection from 2nd magnitude Alnitak, the eastern star in
Orion's belt, which is just outside the image. When I tried to reduce the
impact I lost part of the nebula. Also my 50mm focal reducer lens was not
designed to work with the OGS 20-inch. However working at around F/5 this
image is 20x23 arc minutes. The exposure was 10:5:10:10 minutes exposure in
red, green, blue, and luminance.

George Normandin

George Normandin wrote:
I took this about a week ago. The image has a number of artifacts, including
a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt,
which is just outside the image. When I tried to reduce the impact I lost
part of the nebula. Also my 50mm focal reducer lens was not designed to work
with the OGS 20-inch. However working at around F/5 this image is 20x23 arc
minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue,
and luminance.

George Normandin

I had so many donuts from Alnitak that you could hardly see the nebula
when I tried it. Seemed to reflect back and forth between the Halpha
filter and something. It was a mess. I wanted to try again this year
with it on the eastern side of the meridian hoping that might help. But
the weather had other ideas.

Rick


--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

great shot George! I never had much luck with this one...

George Normandin wrote:
I took this about a week ago. The image has a number of artifacts, including
a reflection from 2nd magnitude Alnitak, the eastern star in Orion's belt,
which is just outside the image. When I tried to reduce the impact I lost
part of the nebula. Also my 50mm focal reducer lens was not designed to work
with the OGS 20-inch. However working at around F/5 this image is 20x23 arc
minutes. The exposure was 10:5:10:10 minutes exposure in red, green, blue,
and luminance.

George Normandin




--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3

"Stefan Lilge" wrote
...
Very nice picture George. Actually the Flame would not be the same without
the artifacts of Alnitak, I think most pictures have them.


Stefan,

The artifact shows much less in the red exposure (since Alnitak is so
blue?). I went so long in red with the idea of using it for the Lum, but
alas, the Lum shows much more of the nebula. I had thought of rotating the
camera and taking a second series that I could combine with the first using
a sigma-reject. That might remove the artifact. However the temp was well
below freezing and my brain froze before I got the second set of
exposures......

One item of luck I did have: one of the stars is listed as the same red
and blue magnitudes in the USNO 2 catalog, and thus must be a G-2 star. I
was able to use it to calibrate the color for this image and perhaps others.

George N

"John N. Gretchen III" wrote
....
great shot George!........

John, et al:

Thanks for the kind words guys!

George N