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Recent Views Of Mercury.

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#1 David Gray

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Posted 23 September 2017 - 01:57 PM

I recently started a thread on the SSO Forum where is shown the first view on this attached here.

 

https://www.cloudyni.../#entry8117915 

 

 Extract “... picking Mercury up in the 16.3” much of the aperture was destined to be masked by the fence so rather than endure a slowly increasing irregular ‘triangular’ aperture I applied the 6” off-axis mask.

 

Still much atmospheric dispersion at that time but as usual this was nicely countered by the orange #22 filter (a #21 is almost as effective).

 

Went to full aperture as it cleared the fence: just at the point when the rising sun seems to whip up some turbulence.  BUT...time and again I have found that there is often a marked settling a little while after sunrise; then after some 20-30 minutes a more serious breakdown – often sudden...

 

As mentioned there the initial view was with the 6” Off-Axis mask on the D-K + #22 filter: and yesterday morning another, and better, view with that setup.

 

Alas this time thick fog came up as the sun climbed – so no full-aperture view.  But that first view of yesterday is shown here below the full aperture one from Sept 19; and it was at that point that the seeing was near perfect....smirk.gif

 

This had been a night of improving definition with marvelous views of all sorts in Orion after a rendering of the Lynx Intergalactic Wanderer globular – to follow here.

 

Dave.

 

Merc 2017 Sep 19 22 II.jpg


Edited by David Gray, 23 September 2017 - 02:25 PM.

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#2 cildarith

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Posted 24 September 2017 - 03:58 PM

Excellent observation of Mercury, Dave!



#3 frank5817

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Posted 25 September 2017 - 10:58 AM

Dave,

 

Both sketches are superb. Very impressive work.

 

Frank :)



#4 niteskystargazer

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Posted 25 September 2017 - 11:34 AM

Dave,

 

Nive sketches Of Mercury smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#5 azure1961p

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Posted 27 September 2017 - 08:37 PM

I like the wratten difference here, a great compliment to the IL view.

 

Superb.

 

Pete



#6 David Gray

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Posted 12 October 2017 - 11:39 AM

Many Thanks All..........smile.gif

 

If conditions come together for the next morning elongation (Dec/Jan) I will be attempting..........tongue2.gif

 

Dave.



#7 ericjam

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Posted 24 October 2017 - 10:09 AM

Hi Dave,

 

 

Wonderful report and  sketches as always.

 

Best,

 

Eric

 

 

 



#8 David Gray

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Posted 04 November 2017 - 11:48 AM

Thanks Eric.

 

Was hoping to follow these views with some of Mars; but only one so far: tho’ too poor conditions for sketching;

even with the orange & red filters catching the NPC and Syrtis Major but only weakly....

 

Cheers,
Dave.



#9 mariosi

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Posted 05 November 2017 - 09:15 AM

Wonderful observation Dave!! Excellent work bow.gif bow.gif

 

Marios



#10 Warmvet

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Posted 05 November 2017 - 01:53 PM

David,

 

When I see your sketches I am always in awe of the detail you can put to paper. 

 

Cindy



#11 Vedran

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Posted 06 November 2017 - 09:38 AM

Nice catch of Mercury!

Is it possible to connect some of those albedo features with real surface features?



#12 David Gray

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Posted 07 November 2017 - 09:41 AM

Thanks Marios, Cindy, Vedran.

 

Nice catch of Mercury!

Is it possible to connect some of those albedo features with real surface features?

 

If you click the link on my first post here to go to my earlier post on the Solar System Forum I give several links on my Post #7 there which deal with the nature and aspect of the planet’s features.

 

In short Mercurian features are very much determined by the numerous bright ray craters.  This makes it different to the aspect of the moon's darker albedo features which is largely due to the extensive dark mare regions.

 

One of those links I put here shows on its third page some images etc. that demonstrate the effects of those ray craters:

 

https://britastro.or...s/Messenger.pdf

 

The darker shadings/albedos mostly being the areas between.

 

Dave


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