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Zeta Cnc image

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#1 Cotts

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Posted 16 February 2016 - 10:01 PM

Just got back from the WSP earlier this afternoon.  I have a fair amount of image processing to do.

 

Here's the first one:  Zeta Cnc, 12.5" f/6.5 Lockwood/Teeter, prime focus in Canon 60Da, 640x480 video crop mode, 60 f.p.s., each frame 1/120sec @ ISO 6400.  200 frames stacked in Lynkeos.

 

ZetaCnc12.5.jpg

 

Despite the mount being Alt-Az, there is zero field rotation due to the short video time of 1 minute and the very narrow field of view....

 

From Stella Doppie, here are the data...

 

 08122+1739 STF1196 AB      2014 pa 17 sep 1.1" mags 5.30 6.25 
 08122+1739 STF1196 AB,C  2015 pa  66 sep 5.9" mags 4.92 5.85 

 

Dave

 

 


  • RAKing, R Botero, Max T and 9 others like this

#2 RAKing

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Posted 17 February 2016 - 08:37 AM

Very nice, Dave!   :waytogo:

 

Zeta Cancri has always been one of my favorites - and I use it to check my scope and seeing conditions every chance I get.

 

Cheers,

 

Ron



#3 PJ Anway

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Posted 17 February 2016 - 06:44 PM

Great image Dave!



#4 rocco13

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Posted 17 February 2016 - 08:01 PM

Observed it a few times relatively low in the sky, and at lower powers (68x). I had no idea the brighter 'one' was a pair. Something to look for next time out. Time to bump up the magnification!



#5 Magnus Ahrling

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Posted 18 February 2016 - 04:53 PM


Very beutiful, Dave. Thanks for posting!

Magnus 57N.

#6 Cotts

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Posted 18 February 2016 - 10:10 PM

thanks for the positive feed back, gang!

 

Dave



#7 Nucleophile

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Posted 19 February 2016 - 08:21 PM

I particularly like the subtle colors that you captured, Dave.

 

I was able to get some vid of this beauty a few night ago and will be keen to see how the colors compare.

 

Sorry if you already mentioned this:  are you able to get these shots at prime focus with your rather longish focal length Teeter reflector or do you need to use a Barlow or the like to achieve focus?


Edited by Nucleophile, 19 February 2016 - 08:22 PM.


#8 Cotts

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Posted 19 February 2016 - 08:45 PM

Prime focus plus a 1.2x lens which moves the focal plane out far enough for the DSLR to reach focus...

Focal length is 2475mm in this configuration.

 

My new ASI 224 camera has arrived and it will reach focus without the 1.2x lens so the focal length will be 2064 mm.

 

Dave



#9 Nucleophile

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Posted 28 February 2016 - 09:00 PM

This system is beautiful.  I observed it again last night and noted a distinct golden-orange hue to the C component through my 15" reflector at 105x using a 19mm Panoptic eyepiece.  At this magnification, the AB pair appears as a singular, bright yellowish-white star.  Increasing the magnification to 395x [Pentax 5XW] nicely separates the AB components to a pair of closely matched white stars; the C component was still a bit orange, but not as much as when viewed with the Televue eyepiece.

 

I hope to have some time soon to process my photo attempt for Zeta Cancri to see what colors present themselves.



#10 apilaure

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Posted 05 March 2016 - 05:55 AM

Beautiful picture congratulations !

 

I'm not sure , but C seems to be a little bit elongated.... HUT 1Ca,Cb is only 0,39" with thêta 321°. The direction of elongation would be nearly correct.

 

What do you think about that ?

 

Philippe.



#11 Daniel Mounsey

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Posted 05 March 2016 - 09:51 AM

pretty cool. nice job



#12 tchandler

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Posted 06 March 2016 - 11:03 AM

Fantastic. As a reference, the space separating the AB components is half of Neptune's minimum angular diameter. 



#13 Cotts

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Posted 06 March 2016 - 11:53 AM

Beautiful picture congratulations !

 

I'm not sure , but C seems to be a little bit elongated.... HUT 1Ca,Cb is only 0,39" with thêta 321°. The direction of elongation would be nearly correct.

 

What do you think about that ?

 

Philippe.

Here is the image blown up to pixel level.  I think we are seeing some atmospheric dispersion.  As I recall the system was only about 45 - 50 degrees above the horizon when i shot this....

 

Screen Shot 2016-03-06 at 11.48.01 AM.jpg

 

Dave



#14 Ed Wiley

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Posted 06 March 2016 - 12:26 PM

Nice, Dave. I think you are correct about the slight atmospheric dispersion. But it in no way detracts from your accomplishment on this pair.

 

Ed



#15 Bonco

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Posted 06 March 2016 - 03:44 PM

Your picture is very representative of what's seen at the eyepiece. Very nice!

Bill




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