ASTRO: NGC 4517A AND NGC 4517

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".

"Rick Johnson" wrote
.....
NGC 4517A is the very blue and very faint galaxy at the top.........

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

Great image of this interesting pair Rick!!

........ 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.........

This area of the sky is "infested" with asteroids ready to catch the unwary
supernova hunter flat-footed!

George N

George Normandin wrote:

"Rick Johnson" wrote
.....

NGC 4517A is the very blue and very faint galaxy at the top.........

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


Great image of this interesting pair Rick!!


........ 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.........


This area of the sky is "infested" with asteroids ready to catch the unwary
supernova hunter flat-footed!

George N


In a typical one or two minute shot used to find those guys asteroids
don't move much so would be a problem. You'd have to run each "hit"
through the small planet center's database to see which you caught.

A school down near Brainerd, MN is doing a super nova hunt using one
minute shots on a C11. They are sticking well away from asteroid alley
for that reason. Also they take a second round of shots of that night's
targets. That's usually two hours or so later allowing any asteroid or
artifact to give itself away. Don't think they've found any as yet.
Found a couple a few days late though so the system is working.

Seeing like I got for this shot is a once a year thing. Sure wish it
was more often!

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".