[AZ-Observing] Re: NGC3718 an d NGC3729

  • From: "Richard Harshaw" <rharshaw2@xxxxxxx>
  • To: <az-observing@xxxxxxxxxxxxx>
  • Date: Tue, 21 May 2013 05:57:28 -0700

Thanks for the explanation. 

As I said, the image is great!  (As usual)



Richard Harshaw
Cave Creek, Arizona
Brilliant Sky Observatory



-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Bernard Miller
Sent: Monday, May 20, 2013 10:23 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: NGC3718 an d NGC3729

Richard,

It is not just the software. eXcalibrator finds all of the G2V stars in an
image (which are the same class of stars as our Sun), which we see as white.
If your color balance is right, all of these stars should look white in the
image. I use the color factors that will make these stars look white, hence
the color balance should be "right". I know there can be variances depending
on filters and atmospheric refraction, but the difference should not be that
much.

Thanks,

Bernard


-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Harshaw
Sent: Monday, May 20, 2013 10:12 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: NGC3718 an d NGC3729

Great image.

As for color, software says it is the right color based on the instructions
written by the programmer. And where did the programmer get THEIR decision
process?  

Ah, who knows...



Richard Harshaw
Cave Creek, Arizona
Brilliant Sky Observatory



-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Bernard Miller
Sent: Monday, May 20, 2013 7:51 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] NGC3718 an d NGC3729

Hi,
 

Here is an image of NGC3718 and its companion NGC3729. These two galaxies
orbit each other with a separation of about 147,000 light years. These two
galaxies are in Ursa Major. It seems most of the images on the web show this
galaxy as blue, but Excalibrator says this is the right color. I am not sure
why the other images are blue. Comments and suggestions are welcomed.

 


http://www.azstarman.net/NGC3718.htm

 

Bernard

 

 

 



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