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Arp 118

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#1 Ivan Maly

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Posted 06 January 2020 - 07:27 PM

Arp 118, interacting galaxy pair (NGC 1143 and 1144), Cetus. Telescope D = 508 mm F/4 Newtonian, ocular 3.5 mm wide-field (570x). Elevation 700 m, sky 21.4 mag/arcsec2, seeing 1-2". Proximal segments of the ring and an incompletely resolved knot in the W segment in NGC 1144 were visible. Pencil, tortillon, white paper. Sketch finished at the telescope. Inverted black-to-white digitally. North up, field 8'. Image license: CC BY 4.0 Ivan Maly.

 

gallery_227647_10427_160708.jpg


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#2 Asbytec

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Posted 06 January 2020 - 07:47 PM

I had to look this one up, your sketch is a perfect match. I wonder if the 'star' to the right is the core of another field galaxy, there is one there. You're kicking it, Ivan. Nice. 


Edited by Asbytec, 06 January 2020 - 07:48 PM.


#3 Ivan Maly

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Posted 06 January 2020 - 11:55 PM

No, I missed the third galaxy, it would be north of the midpoint between the pair and the star. Thanks! We had a wonderful night, even if a little bright (natural air glow). And not too cold, and I personally didn't get stuck in the snow. 9 h of astronomical dark. And the next night we had 10.


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#4 cildarith

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Posted 07 January 2020 - 12:55 AM

Actually Norme is correct.  Your "star" is the galaxy 2MASX J02550068-0009498

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#5 Asbytec

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Posted 07 January 2020 - 03:51 AM

Actually Norme is correct. Your "star" is the galaxy 2MASX J02550068-0009498


The bright star like nucleus or core. Yes, maybe. Possibly. I think so. I thought it was the other one. But it's one or the other.

Edited by Asbytec, 07 January 2020 - 03:52 AM.


#6 Ivan Maly

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Posted 07 January 2020 - 10:17 AM

Thank you, guys. I see now that whether it was PGC 1150350 (the small edge-on) or the 2MASX farther W, the starlike object I plotted was a galaxy core. The PGC redshift is known and nearly the same as the Arp pair's, so all four are probably a true group at around 400 Mly. Something to revisit!


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#7 niteskystargazer

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Posted 07 January 2020 - 04:18 PM

Ivan,

 

Fine sketch of Arp 118 smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#8 frank5817

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Posted 07 January 2020 - 06:50 PM

Ivan,

 

Very impressive sketching of these galaxies.

 

Frank :)




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