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Stock 2, ASCC 8

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#1 Sasa

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Posted 05 September 2019 - 05:20 PM

I discovered small open cluster ASCC8 by chance a year ago when I was scanning the vicinity of h and chi Per in order to find open cluster Stock 2. I was lazy to for it in a sky atlas. That night I misidentified the position of Stock2, I thought that it was actually another clumps of stars (which turned out just to be a cluster of stars, no real open cluster was plotted in Interstellarum Deep Sky Atlas). I made a quick sketch to identify later on, what I saw (see last page in this report: https://www.fzu.cz/~...80806_FOA60.pdf)

I returned to the area two nights ago with 60mm refractor. It was very beautiful and rich star field. In particular I liked the subtle colors shown by several stars. I decided to try to capture this beauty. I started with low power eyepiece (13x) with about 3 degrees field of view. For the clusters I used 33x as well in order to record fainter stars. I was not able to scan and sketch whole 3 degrees at this power in two nights (about 2,5 hours of sketching time). Larger power was also revealing star colors better. The second night was better and I noticed colors in few more stars that I missed previous night. In total, I recorded more than 300 stars. I then redraw them in computer, and I added star colors and some lighter background that I noticed in the clusters at low powers:

stock2_20190903.jpg

Edited by Sasa, 05 September 2019 - 07:03 PM.

  • KidOrion, *skyguy*, Jef De Wit and 7 others like this

#2 niteskystargazer

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Posted 06 September 2019 - 02:35 PM

Alexander,

 

Very nice sketch of Stock 2, ASCC 8 smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#3 Sasa

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Posted 06 September 2019 - 05:32 PM

Thanks Tom.

 

BTW, as I make this sketch at two powers and because I collected large statistics I can estimate how the reach of 60mm refractor changes with the power. I can roughly say, that I was regularly capturing at 13x stars down to magnitudes 9.7-9.8, sometimes going slightly below 10.0. Switching to 33x, I was recording stars below 11.0, typically down to 11.2-11.3, sometimes going below 11.5. Another magnitude can be gained by switching to very high powers. In the sketch of M52 I was going down to 12.2-12.4 at 177x (if I remeber well). And I know, that if I really concentrate strongly at very high magnifications, I'm able to glimpse for short moments 13.0 mag star at the east edge of M57.



#4 azure1961p

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Posted 09 September 2019 - 12:34 PM

Alex

 

The piece is superb and these are new to me .  I like the outreaching limbs .

Really your drawing has really become quite finessed . Really a pleasure to see these.  Your skills deserve it.

 

I think, you may have your own thoughts my best magnification for seeing faint stars is between 45-75x per inch of aperture. Blackening that sky background but retaining the stellar brightness since it's a point source does wonders.  I recall hitting a nice faint magnitude number on a star  with a NELM of 6.  So naturally, I'm thinking - if I go a truly dark sky site I'll get this.amazing faint magnitude number.  But it's not to be. A NELM 7 over a NELM 6 doesn't get you a fullagniyufe deeper at your faint star threshold.  Instead it's only incremental.  The blackening if the sky background at high-power is SO EFFECTIVE a tool a full magnitude darker sky only nets you a fraction better.  It's still good - it's still real but it's a good testament to the technique of high-power faint star viewing.

 

Pete



#5 frank5817

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Posted 11 September 2019 - 08:06 PM

Alexander,

 

Now this looks really nice from a dark sky.

 

Frank :)




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