ASTRO: NGC 4517A AND NGC 4517 Repost

The original post missed a lot of servers so I'm reposting it. It's not
often I get seeing as good as this this low in the sky.
Rick

About 5 weeks ago George N posted a shot of NGC 4517 remarking it needed
to be redone in color. As it was already west of the meridian where my
seeing is worse I figured on doing it next year. Turned out I had
already taken it 2 month's earlier and lost it on the hard drive. Odd
I'd forget as this was taken on a night of (for me) great seeing, that
is very rare here. I should have processed this three months ago!

NGC 4517A is the very blue and very faint galaxy at the top. I cheated
when processing this and processed it separately in the Luminosity
image. Otherwise it was very faint when NGC 4517 was correctly
processed. Color frames were processed normally however so the relative
colors are correct, just not the brightness.

NGC 4517 seems to have no visible nucleus. It may be hidden because it
is seen so near edge on.

Due to threat of clouds I took half the luminosity data, than half the
color data then repeated the process. The clouds I was worried about
prevented a second blue frame. Since this is a LRGB image the asteroid
just above NGC 4517 appears as two short lines separated by the time the
first color data segment was taken. It is Sazava at magnitude 16.2 and
is thought to be about 22.67 km in diameter, albedo 0.0479. I have no
idea who or what Sazava is named for.

14" LX200R @ f/10, L=4x10' RG=2x10' B=1x10' all binned 2x2, STL-11000XM,
Paramount ME

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".

Good idea to repost it as it would be a shame not to get this very good
picture. My server missed it too, but it also misses about 90% of my own
posts...

Stefan


"Rick Johnson" schrieb im Newsbeitrag
...
The original post missed a lot of servers so I'm reposting it. It's not
often I get seeing as good as this this low in the sky.
Rick

About 5 weeks ago George N posted a shot of NGC 4517 remarking it needed
to be redone in color. As it was already west of the meridian where my
seeing is worse I figured on doing it next year. Turned out I had
already taken it 2 month's earlier and lost it on the hard drive. Odd
I'd forget as this was taken on a night of (for me) great seeing, that
is very rare here. I should have processed this three months ago!

NGC 4517A is the very blue and very faint galaxy at the top. I cheated
when processing this and processed it separately in the Luminosity
image. Otherwise it was very faint when NGC 4517 was correctly
processed. Color frames were processed normally however so the relative
colors are correct, just not the brightness.

NGC 4517 seems to have no visible nucleus. It may be hidden because it
is seen so near edge on.

Due to threat of clouds I took half the luminosity data, than half the
color data then repeated the process. The clouds I was worried about
prevented a second blue frame. Since this is a LRGB image the asteroid
just above NGC 4517 appears as two short lines separated by the time the
first color data segment was taken. It is Sazava at magnitude 16.2 and
is thought to be about 22.67 km in diameter, albedo 0.0479. I have no
idea who or what Sazava is named for.

14" LX200R @ f/10, L=4x10' RG=2x10' B=1x10' all binned 2x2, STL-11000XM,
Paramount ME

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".