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Schaden
sage


Reged: 06/30/08

Loc: Sonoran Desert
Re: Encke Division new [Re: BillFerris]
      #5890432 - 05/29/13 10:11 AM

Quote:

Quote:



Your description is of the Encke Minima, a broad low contrast feature roughly in the middle of the A-Ring. I would describe this feature as trivial in a 10-inch aperture. It was regularly visible in my old, contrast-challenged Meade Starfinder 10-inch equatorial Newtonian. Based on that experience, I see no reason to doubt it can be observed in a good 6-inch aperture.

Bill in Flag




Recently I read an article in the latest Astronomy magazine where the author said he'd seen Encke's Minima in a 4" reflector.


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Ziggy943
Post Laureate


Reged: 08/11/06

Loc: Utah
Re: Encke Division new [Re: Schaden]
      #5893499 - 05/31/13 01:04 AM

Although I have met him only a couple of times, I count John Pons among my friends. He related to me and observation of Encke's division through an 8" refractor. I forget the name of the owner but he said Encke's was visible all around. I have no reason to doubt John's observation.

As stated ealier in this thread, I have seen it twice in my 9" Clark.


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Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: Encke Division new [Re: Ziggy943]
      #5909240 - 06/08/13 06:39 AM

Thanks for posting that, Ziggy.
M.


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E_Look
Post Laureate


Reged: 03/06/08

Loc: near New York
Re: Encke Division new [Re: Mark Harry]
      #5910443 - 06/08/13 09:27 PM

Ziggy, would that be true through a 8" reFLEctor?

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Starry eyes
super member


Reged: 04/30/10

Re: Encke Division new [Re: E_Look]
      #5926760 - 06/18/13 01:47 AM

I hesitate to add my two cents worth but... Over the course of several decades I have seen Encke division and shown it to others fairly often with a 6.75" off axis mask on a 18" split ring equatorial. I attribute this to a effective slow F ratio, a smooth mirror, unobstructed aperture, Naglers, great seeing in California's coastal mountains, an extremely steady mount with tracking, great ergonomics for the eyepiece giving a comfortable view, and, I guess we didn't know better. Never could trace it all the way around. I bring this up to demonstrate that perhaps there are a few more factors to consider in this civil discussion about the interaction of the human eye.

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