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Another galaxy chain (VV 159)

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#1 IVM

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Posted 17 September 2019 - 01:56 PM

Arp 324, or UGC 10143 chain, first cataloged as VV 159. Hercules, in galaxy cluster Abell 2147. June 2019. Telescope: D=508 mm, F/4. Ocular: 5.5 mm. Site: sky brightness 21.5 mag/arcsec, elevation 700 m. Sketch: white paper, pencil, blending stump, finished at the scope. Digitization: camera, daylight. Presented here with the north up, approx. 30 arcmin tall.

 

Arp%2B324%2BJuly%2B2019%2BN%2Bup%2B400w.


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#2 niteskystargazer

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Posted 17 September 2019 - 03:09 PM

IVM,

 

Nice sketch of Another galaxy chain (VV 159) smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#3 azure1961p

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Posted 18 September 2019 - 08:57 AM

Nice variation in the central halos.

 

Pete



#4 IVM

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Posted 18 September 2019 - 09:54 AM

Thanks! According to my written notes, these variations are real, i.e. not an artifact of blending with the stump in the dark. I am currently moving away from blending to just using pencil when producing a finished sketch at the scope.

 

In reality, VV 159d (the little N-S streak just E of a star in the S-middle of the chain) is two small objects in contact, also known as III Zw 75, with at least the S component of it being PGC 2790838. But these were not resolved.

 

Photographically, there are many more galaxies in the sketched field - around the chain - that should be within reach under these conditions if targeted specifically. But they were not observed, because they don't jump out at you.



#5 azure1961p

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Posted 20 September 2019 - 11:04 AM

Ivan I'm curious, why not blend?  You do a fine job of it. Frankly it'd be a shame if you stopped.  Yes there's variation in paper fiber and how it holds graphite but its still always worth it.   And then of course is the written description that hashes this out.  If anything, just look for a more uniform paper, Strathmore has nice grades.  I sanded my blending stumps to get a more diffuse blend back in the day when I drew these sorts of things.  That made a big difference.

 

All that aside, yes the variation in halo's is part of the fun in observing and here, appreciating your work.

 

Pete



#6 IVM

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Posted 20 September 2019 - 12:39 PM

Great points, Pete, thanks!




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