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Best seeing map?

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27 replies to this topic

#26 Astro-Master

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Posted 17 October 2023 - 07:11 PM

Professional Observatories built on mountain tops usually have good seeing, dark skies and good transparency weather permitting.  There may be some that will allow you to set up nearby, Mt Lemon in Arizona might be one, and the McDonald Observatory in Texas might be another.

 

Keith Rivich post #7 on this topic might be able to give you more information about the McDonald Observatory, being an active Texas observer.



#27 kimcheese

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Posted 19 October 2023 - 10:58 AM

Using an app that has a 3 day pressure/jet stream forecast feature.  Not sure how frequently it is updated.  Assuming at least daily.  Dual Radar. I think it was a freebie with ads.  Few dollars to remove the ads.  Available at the Apple Ap store.   Multiple other current and forecast radar features.  Water vapor satellite images (GOES infrared water vapor) might also be useful.



#28 luxo II

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Posted 20 October 2023 - 03:37 AM

There are plenty of maps showing light pollution, but I’m having trouble finding one that shows the best seeing.
Do you know if such a map is available?

Sering is highly variable depending on:

 

a) the presence of heat sources nearby (hot roofs, chimneys (fireplaces), large buildings with aircon, carparks and so-on).

Hence why seeing is usually better in parkland than in suburbia.

 

b) the terrain, and the way the prevailing wind behaves as it flows over.

Terrain upwind of you that creates turbulence is something you want to avoid (mount ranges).

Terrain that creates laminar flow or even better, compression on a ridge facing into laminar flow should give good seeing.

 

I'm aware of at least one major observatory which, during the site selection, was not aware of the relationship between for rough terrain upwind and downwind turbulence; while it is on a high peak, it is also downwind of a series of large ridges upwind and the result is poor seeing. If they had chosen a site a few km upwind of the ridges they'd have obtained much better seeing most nights. 


Edited by luxo II, 20 October 2023 - 03:41 AM.



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