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Arp 54

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#1 Ivan Maly

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Posted 04 January 2020 - 03:20 PM

Observation: 2019-12-21. Location: Cherry Springs (elevation 700 m). Sky: 21.42 mag/arcsec2 in zenith, seeing 1-2 arcsec. Telescope: D = 508 mm, F/4 Newtonian. Ocular: 5.5 mm wide-field (360x).
Object: Arp 54, MCG-1-7-7 and PGC 9107, Cetus. Arp catalog category: "Spiral, high-SB companion on arms."
Sketch: North up, field 3 arcmin. Pencil, tortillon, white paper. Finished at the telescope. Sketch photographed and inverted black-to-white digitally.

 

 

gallery_227647_10427_15635.jpg


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#2 Asbytec

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Posted 04 January 2020 - 03:27 PM

Wow. Beautiful site to see, beautiful object.

#3 Warmvet

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Posted 05 January 2020 - 01:01 PM

Ivan,

 

At 14.9 mag thats some dim magnitude sketching!  The 20” must be a joy for finding the faintest fuzzies. Nice work

 

Cindy



#4 Ivan Maly

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Posted 05 January 2020 - 01:45 PM

Yes, Norme and Cindy - it is beautiful and dim. And also tiny. The 20 is indeed a joy under dark skies, although we were missing a few tenths of a magnitude due to some pretty strong natural sky glow. Thanks for your comments!


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#5 Asbytec

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Posted 05 January 2020 - 05:36 PM

What's interesting is you seem to be in the same 2 to 1mm exit pupil range I find productive on smaller galaxies. It illustrates the power of a larger aperture to magnify a small object enough to see it well. This galaxy is not only too dim already, but it's too small for my 8", as well. No way I could take it anywhere close to 300x and still see it and likely not detect its small image at lower magnification.

Edited by Asbytec, 05 January 2020 - 05:37 PM.


#6 Ivan Maly

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Posted 05 January 2020 - 07:05 PM

Exactly right, 1-2 mm. Sometimes just under 1, like in the next sketch I have.


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#7 niteskystargazer

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Posted 06 January 2020 - 11:11 AM

Ivan,

 

Nice sketch of Arp 54 smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom




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