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NGC 2170 and friends

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#1 spokeshave

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Posted 08 March 2019 - 07:21 PM

This is another tough target. It never rises very high for me and it is fairly dim. It took me 1000 60-second lum subs to bring out the detail I wanted and it still could take more. Sadly, I have been working on this one since before Christmas and it is starting to set to early for me to get more useful data. That gives an idea of how few clear nights I have had. For those that have been "clear" I was still plagued by high clouds and terrible seeing. But it is what it is and I'm calling it done for now. I'll try to revisit it next winter to add more data.

NGC 2170 completed small.jpg

get.jpg?insecure

Tim

Edited by spokeshave, 08 March 2019 - 07:28 PM.

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#2 Jon Rista

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Posted 08 March 2019 - 07:23 PM

Wow! That is a fantastic image, Tim! That goes really deep. Very crisp. Always loved this object...never had a chance to image it myself. And you just set the bar rather high. ;) 



#3 spokeshave

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Posted 08 March 2019 - 07:27 PM

Thanks Jon.

Tim

#4 Dynan

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Posted 08 March 2019 - 08:26 PM

Great image!

 

And it'll be back next year. Just be ready.

And lose those clouds! (But don't lose them in my neighborhood, please. I have plenty.)



#5 buckeyestargazer

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Posted 09 March 2019 - 09:35 AM

Beautiful.  Well done Tim.



#6 spokeshave

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Posted 09 March 2019 - 01:32 PM

Thanks Joel.

Tim

#7 spokeshave

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Posted 09 March 2019 - 01:33 PM

Great image!
 
And it'll be back next year. Just be ready.
And lose those clouds! (But don't lose them in my neighborhood, please. I have plenty.)


Thanks Dynan. I intend to revisit it next year.

Since you have clouds already, what would it hurt for you to take mine too?

smile.gif

Tim

#8 Dynan

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Posted 09 March 2019 - 03:45 PM

Send 'em on over. Maybe they'll get so crowded and heavy that they'll fall out of the sky!



#9 Jim Thommes

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Posted 12 March 2019 - 07:05 PM

Nicely done on this target Tim. I can't tell how you assembled your data. From you Astrobin entry, it sounds like you used LRGB and NB filters. Luminance was 60 seconds. I am curious about your thoughts on exposure. How do you think you would have done with 100 600-second subs?



#10 spokeshave

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Posted 13 March 2019 - 05:44 PM

Nicely done on this target Tim. I can't tell how you assembled your data. From you Astrobin entry, it sounds like you used LRGB and NB filters. Luminance was 60 seconds. I am curious about your thoughts on exposure. How do you think you would have done with 100 600-second subs?


Thanks Jim. The Lum and RGB subs were all 60s. I used the QHY163M which has very low read noise so there is very little read noise hit per sub and since the field has many bright stars, I chose 60s to keep them from saturating too badly. Actually, after drizzle integration, they were not saturated at all (though the undrizzled subs were). I also blended in Ha data, that consisted of 300s subs. Much longer than that and the amp glow starts to become more challenging to manage.

Tim

#11 Jeff2011

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Posted 13 March 2019 - 08:58 PM

Beautiful image Tim.  The abin link is a must see.  Good call on the 60 sec subs.  What gain setting did you use? I have the ZWO version of that camera but have yet to try it on my FSQ.  



#12 LYAstro

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Posted 14 March 2019 - 12:55 AM

Nice image!



#13 spokeshave

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Posted 14 March 2019 - 04:16 AM

Beautiful image Tim.  The abin link is a must see.  Good call on the 60 sec subs.  What gain setting did you use? I have the ZWO version of that camera but have yet to try it on my FSQ.


Thanks. Gain is 200, offset is 125.

Tim

#14 spokeshave

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Posted 14 March 2019 - 04:17 AM

Nice image!

Thanks!

Tim

#15 Jeff2011

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Posted 14 March 2019 - 11:11 AM

Thanks. Gain is 200, offset is 125.

Tim

Thanks Tim.  I am having problems finding the gain scale on the QHY site.  They appeared to have redesigned their website to be more sales oriented and I can't find the usual charts and graphs.

 

Also what is the approximate Bortle number of your backyard?



#16 spokeshave

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Posted 14 March 2019 - 06:48 PM

Thanks Tim.  I am having problems finding the gain scale on the QHY site.  They appeared to have redesigned their website to be more sales oriented and I can't find the usual charts and graphs.
 
Also what is the approximate Bortle number of your backyard?


Yeah, QHY really screwed up their web site. It is really difficult to navigate and find info. The charts for the QHY163M are here:

https://www.qhyccd.c...=94&id=15&cut=1

My skies are Bortle 3.

Tim

#17 Jeff2011

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Posted 14 March 2019 - 09:28 PM

Thanks.  It is interesting those short subs work well from that dark of skies.  Congrats on the IOTD.




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