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astro: m95



 
 
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  #1  
Old January 13th 08, 09:25 PM posted to alt.binaries.pictures.astro
John N. Gretchen III
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Posts: 460
Default astro: m95

10x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
over-processed with AstroArt and Photoshop

Type of object: Galaxy
RA (J2000.0): 10h 44m 00.0s
Dec (J2000.0): +11 42' 00"
Constellation: Leo
Magnitude: 9.7
Surface brightness: 13.5
Size: 7.3'x4.4'
Position angle: 13
Object classification: SBb
Description: B,L,R,pgmbMN
Notes: Leo group

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

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  #2  
Old January 13th 08, 11:34 PM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
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Posts: 985
Default astro: m95

that came out pretty nice John

I like the b/w inverted palette one with the labels a lot.

you just can't beat the inverted palette to see the details

but the color ones are always more aesthetically pleasing. So I agree with
your idea of showing it both ways


"John N. Gretchen III" wrote in message
m...
10x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
over-processed with AstroArt and Photoshop

Type of object: Galaxy
RA (J2000.0): 10h 44m 00.0s
Dec (J2000.0): +11 42' 00"
Constellation: Leo
Magnitude: 9.7
Surface brightness: 13.5
Size: 7.3'x4.4'
Position angle: 13
Object classification: SBb
Description: B,L,R,pgmbMN
Notes: Leo group

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



  #3  
Old January 14th 08, 12:01 AM posted to alt.binaries.pictures.astro
John N. Gretchen III
external usenet poster
 
Posts: 460
Default astro: m95

Thank you Richard! This was my first stack of images taken with this
camera. I learned a few things that will help the next time.

Richard Crisp wrote:
that came out pretty nice John

I like the b/w inverted palette one with the labels a lot.

you just can't beat the inverted palette to see the details

but the color ones are always more aesthetically pleasing. So I agree with
your idea of showing it both ways


John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3
  #4  
Old January 14th 08, 01:00 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default astro: m95



John N. Gretchen III wrote:
10x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
over-processed with AstroArt and Photoshop

Type of object: Galaxy
RA (J2000.0): 10h 44m 00.0s
Dec (J2000.0): +11 42' 00"
Constellation: Leo
Magnitude: 9.7
Surface brightness: 13.5
Size: 7.3'x4.4'
Position angle: 13
Object classification: SBb
Description: B,L,R,pgmbMN
Notes: Leo group


------------------------------------------------------------------------


I've wondered about the exposure time of a one shot versus mono with
filters. You work at f/4. When I run at f/10 but bin 2x2 with my 9
micron pixels (18 when binned 2x2) it is about the same as running at
f/5 as far as exposure is concerned. You are running f/4 but with
smaller pixels with slightly higher quantum efficiency. I don't know
how dark your skies are. I have a 6.5 limiting zenith magnitude when
there's no ice or moon in the way. That was the case when I took this
guy using 7x5 minutes for the luminosity and 3x5 for each color. Since
then I've found 10 minute subs are better and give less noise over the
same time. So I need to redo this but at 1:20 or nearly double your
40 minutes it appears the time penalty for mono isn't as great as I
thought it was. The core of this guy is very interesting if you process
it separately then combine the two you can bring out the three parts to
it. Two are connected by a blue arc.
http://www.usenet-replayer.com/cgi/c...6100237.4.jpeg

I see replayer has died as it hasn't picked up anything new since Jan 5
when George put up the Google Earth shots of Kopernik.

It appears color processing with your new camera is far easier than it
was with your old one. Is that the case?

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".

  #5  
Old January 14th 08, 02:06 AM posted to alt.binaries.pictures.astro
John N. Gretchen III
external usenet poster
 
Posts: 460
Default astro: m95

This data can be processed better as I learned a few things along the
way that will help next time. The sky conditions the night of this shot
were high clouds but still better than mag7. The data produce by this
camera is going to make better images than my old mx5c with less work.
Faster?, deciding when to stop processing is the real question.

Rick Johnson wrote:


John N. Gretchen III wrote:
10x240 seconds
Meade 8" Schmidt-Newtonian
Celestron Advanced Series GT
Sbig ST2000XCM
over-processed with AstroArt and Photoshop

Type of object: Galaxy
RA (J2000.0): 10h 44m 00.0s
Dec (J2000.0): +11 42' 00"
Constellation: Leo
Magnitude: 9.7
Surface brightness: 13.5
Size: 7.3'x4.4'
Position angle: 13
Object classification: SBb
Description: B,L,R,pgmbMN
Notes: Leo group


------------------------------------------------------------------------


I've wondered about the exposure time of a one shot versus mono with
filters. You work at f/4. When I run at f/10 but bin 2x2 with my 9
micron pixels (18 when binned 2x2) it is about the same as running at
f/5 as far as exposure is concerned. You are running f/4 but with
smaller pixels with slightly higher quantum efficiency. I don't know
how dark your skies are. I have a 6.5 limiting zenith magnitude when
there's no ice or moon in the way. That was the case when I took this
guy using 7x5 minutes for the luminosity and 3x5 for each color. Since
then I've found 10 minute subs are better and give less noise over the
same time. So I need to redo this but at 1:20 or nearly double your
40 minutes it appears the time penalty for mono isn't as great as I
thought it was. The core of this guy is very interesting if you process
it separately then combine the two you can bring out the three parts to
it. Two are connected by a blue arc.
http://www.usenet-replayer.com/cgi/c...6100237.4.jpeg


I see replayer has died as it hasn't picked up anything new since Jan 5
when George put up the Google Earth shots of Kopernik.

It appears color processing with your new camera is far easier than it
was with your old one. Is that the case?

Rick


--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3
  #6  
Old January 15th 08, 03:08 AM posted to alt.binaries.pictures.astro
George Normandin[_1_]
external usenet poster
 
Posts: 1,022
Default astro: m95


"John N. Gretchen III" wrote

Isn't this one of those 'springtime galaxies'?

Great view John.

Too bad Alan Chen doesn't post here anymore. I attended his presentation
on one-shot color imaging at last year's Cherry Springs Star Party and he
almost had me "convinced" it is better than mono & filters.......

George N


  #7  
Old January 15th 08, 04:10 AM posted to alt.binaries.pictures.astro
John N. Gretchen III
external usenet poster
 
Posts: 460
Default astro: m95

Thanks George!

George Normandin wrote:
"John N. Gretchen III" wrote

Isn't this one of those 'springtime galaxies'?

Great view John.

Too bad Alan Chen doesn't post here anymore. I attended his presentation
on one-shot color imaging at last year's Cherry Springs Star Party and he
almost had me "convinced" it is better than mono & filters.......

George N



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




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