Ancient Stardust


Roland Christen
 

I ran across this little jewel a few weeks ago while hunting up something to image with the Mach2 and 160EDF refractor, using unguided exposures. The open cluster NGC 6791 has a dozen or so bright (mostly red) stars in the foreground and thousands of fainter blue ones hiding behind. Taken thru murky skies during a summer heatwave that won't quit.

https://www.astrobin.com/9wa11k/0/?real=&nc=Uncarollo


Dean Jacobsen
 

Most excellent!  I just added it to my imaging list.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Luca Marinelli
 

That’s a very nice star field. Lovely color and contrast!

—Luca


Dean Jacobsen
 

Roland, if you are into imaging star clusters - and who wouldn't be if they had one of those nifty 160EDF telescopes - then put NGC 7789 on your list.  It is another one of those ancient open clusters with numerous red giants.  Approximately 1.6 billion years old.  It is more than twice as big and much brighter than NGC 6791.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Stuart <stuart.j.heggie@...>
 

Lovely! 


On Tue, 7 Jul 2020 at 18:36, uncarollo2 <chris1011@...> via groups.io <chris1011=aol.com@groups.io> wrote:
I ran across this little jewel a few weeks ago while hunting up something to image with the Mach2 and 160EDF refractor, using unguided exposures. The open cluster NGC 6791 has a dozen or so bright (mostly red) stars in the foreground and thousands of fainter blue ones hiding behind. Taken thru murky skies during a summer heatwave that won't quit.


--

Stuart
http://www.astrofoto.ca/stuartheggie/


Roland Christen
 

Ok, if I get a chance. Right now it's monsoon out there.

Rolando



-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Tue, Jul 7, 2020 7:13 pm
Subject: Re: [ap-gto] Ancient Stardust

Roland, if you are into imaging star clusters - and who wouldn't be if they had one of those nifty 160EDF telescopes - then put NGC 7789 on your list.  It is another one of those ancient open clusters with numerous red giants.  Approximately 1.6 billion years old.  It is more than twice as big and much brighter than NGC 6791.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Dean Jacobsen
 

You have a couple of months, it is in Cassiopeia.  :-)  Just giving you some advance warning.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Michael Hambrick <mike.hambrick@...>
 

Very nice Roland ! The technical card did not say how many sub frames were taken through each filter. Can you share that information with us ?


Best Regards

Michael Hambrick
ARLANXEO
TSR Global Manufacturing Support
PO Box 2000
Orange, TX 77631-2000
Phone: +1 (409) 882-2799
email: mike.hambrick@...


Roland Christen
 

There was no way to enter each filter exposure, only the total exposure. Each filter had 12 exposures of 300 seconds for a total of 48.

Rolando



-----Original Message-----
From: Michael Hambrick via groups.io <mike.hambrick@...>
To: main@ap-gto.groups.io
Sent: Wed, Jul 8, 2020 5:41 am
Subject: Re: [ap-gto] Ancient Stardust

Very nice Roland ! The technical card did not say how many sub frames were taken through each filter. Can you share that information with us ?


Best Regards

Michael Hambrick
ARLANXEO
TSR Global Manufacturing Support
PO Box 2000
Orange, TX 77631-2000
Phone: +1 (409) 882-2799
email: mike.hambrick@...


Dean Jacobsen
 

Roland, on the acquisition details page there is an orange button on the upper left to get to a different form that will let you enter more detailed acquisition information.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Roland Christen
 


Roland, on the acquisition details page there is an orange button on the upper left to get to a different form that will let you enter more detailed acquisition information.
Yes, I use that, but it still does not allow different exposures on different filters.

Rolando


-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Wed, Jul 8, 2020 10:05 am
Subject: Re: [ap-gto] Ancient Stardust

Roland, on the acquisition details page there is an orange button on the upper left to get to a different form that will let you enter more detailed acquisition information.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Dean Jacobsen
 

The way it is set up isn't the best, but there is an "add more" button on the bottom so you can enter in the details for one filter first, then click on the "add more" button for the page to expand and you can add details for another filter, etc.
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Michael Hambrick <mike.hambrick@...>
 

Thanks for that information Roland.

It is interesting that you used the same number of blue sub-frames as for the other filters. I have read that most CCD cameras are less sensitive to blue light, and with that many blue stars I would have expected to see more blue sub-frames.

I will add NGC 6791 to the list of objects to capture with my 180 EDT if we ever get a break in the weather and the Sahara dust in Southeast Texas.

Best Regards

Michael Hambrick
ARLANXEO
TSR Global Manufacturing Support
PO Box 2000
Orange, TX 77631-2000
Phone: +1 (409) 882-2799
email: mike.hambrick@...