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Sketch of 46P/Wirtanen

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#1 Slartibartfast

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Posted 12 December 2018 - 01:09 AM

It's been a while since I've posted a sketch here.  So, here goes.  I got out tonight and observed Comet 46P/Wirtanen and decided to break out the sketch kit and make a pencil sketch.  The transparency was not so good tonight and soon after I made the sketch the clouds set in.  I have been watching this comet for the past few nights in my 25x100 binoculars, but tonight I setup the Lightbridge 16 and let it cool for an hour or so with a fan blowing on the primary.  I had the 25x100's setup and trained on the comet, but for some reason I had real problems finding it in the LB16, so I used the binoculars to find a star hopping route starting at Menkar in Cetus to 96 Kap1 Ceti to 97 Kap2 Ceti to HD21018 to the comet, which was nestled near HD21440 and just north of HD21243.  Then, I followed the same star hopping route in the LB16 and found it.  I thought the N26T5 eyepiece gave a good view, so I sketched it.  So, here's my sketch.

64P.jpg

 

The scanner made it kind of grainy, but, in reality the nucleus faded smoothly into the gray background.  HD21440 was just outside the FOV, but I plotted it anyway.

 

Thanks! 

 

Correction: I used the N26T5 eyepiece for a 1.1 deg. TFoV and 70x magnification.


Edited by Slartibartfast, 12 December 2018 - 01:59 AM.

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#2 agmoonsolns

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Posted 12 December 2018 - 02:44 AM

Great work!



#3 Susan H

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Posted 12 December 2018 - 05:23 AM

Great sketch! Thanks for sharing. Clear skies. 



#4 niteskystargazer

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Posted 12 December 2018 - 12:08 PM

Hi,

 

Very nice Sketch of 46P/Wirtanen smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#5 Augustus

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Posted 12 December 2018 - 04:10 PM

Great sketch! Reminds me of the view through my 20" albeit a little dimmer.



#6 astronz59

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Posted 13 December 2018 - 01:30 AM

Good catch! Persistence pays with this thing....Did you manage to make a magnitude estimate? waytogo.gif



#7 Slartibartfast

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Posted 13 December 2018 - 11:58 AM

Thanks everyone!  I didn't make a magnitude estimate.  Judging from memory, it was brighter (or seemed brighter) than M35 at mag 5.3.  So, brighter than mag 5.3, but definitely not naked-eye from my location.



#8 frank5817

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Posted 14 December 2018 - 01:43 PM

Looks very good.

 

Frank :)



#9 Warmvet

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Posted 14 December 2018 - 02:01 PM

Nicely done, I enjoy also hearing the challenges of star hopping. A real feat I can attest to without goto. Did you observe the tail jets here? I see them in your sketch and I have been looking for them but so far have not been able to observe them.

 

Cindy


Edited by Warmvet, 14 December 2018 - 02:01 PM.

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#10 Slartibartfast

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Posted 17 December 2018 - 10:41 AM

Nicely done, I enjoy also hearing the challenges of star hopping. A real feat I can attest to without goto. Did you observe the tail jets here? I see them in your sketch and I have been looking for them but so far have not been able to observe them.

 

Cindy

I was not able to observe the tail jets.  The comet was a smooth and uniform fade from the brighter nucleus to the background sky with no discernible edge.  The grainy appearance in the sketch was probably due to my pencil strokes and noise from the scanner.  I used a blending stump to try to smooth the coma, but it seems like it was not smooth enough.  We've had rain and clouds here since I made this observation, but tonight I may get a clear window of opportunity to make another observation.  I'll see if I can see any irregularities to the coma tonight if I get out.


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