Angular Resolution: Best Possible Observing Distance for Stars

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Discussion Overview

The discussion revolves around the best possible angular resolution when observing distant stars using optical instruments. It touches on theoretical aspects, including the effects of diffraction and atmospheric conditions on resolution.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants propose that the best angular resolution is determined by the diameter of the aperture and the wavelength of light being observed.
  • Others mention the concept of "diffraction limited telescope" as relevant to understanding angular resolution.
  • A later reply emphasizes that ground-based telescopes are often limited by atmospheric seeing rather than just the diffraction limit, highlighting the impact of atmospheric turbulence on signal quality.

Areas of Agreement / Disagreement

Participants generally agree on the factors affecting angular resolution, but there is a distinction made between theoretical limits and practical limitations due to atmospheric conditions, indicating a lack of consensus on the best observing conditions.

Contextual Notes

The discussion does not resolve the complexities of how atmospheric conditions interact with theoretical models of angular resolution, nor does it clarify the specific wavelengths or aperture sizes being referenced.

intervoxel
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Supposing a perfect optical instrument, what is the best angular resolution possible when observing distant stars?
 
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You may want to read up on the concept of "diffraction limited telescope".
 
intervoxel said:
Supposing a perfect optical instrument, what is the best angular resolution possible when observing distant stars?

The depends almost entirely upon the diameter of the aperture and the wavelength you are asking about.

http://en.wikipedia.org/wiki/Airy_disk
 
The previous answers are entirely correct, but also note that ground-based telescopes (as apposed to space-based) are often more limited by 'seeing' than the diffraction limit. Atmospheric Seeing is deterioration of the signal based on variations (turbulence, etc) in the atmosphere.
 

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