Apparent Places with an Ellipsoidal Geometry of Refraction in the Earth's Atmosphere

Details Apparent Places with an Ellipsoidal Geometry of Refraction in the Earth's Atmosphere Apparent Places with an Ellipsoidal Geometry of Refraction in the Earth's Atmosphere

2009-07-06

arxiv.org/abs/0907.1104v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

6 pages, 3 figures

Scientific paper

The displacement of star images by atmospheric refraction observed by an Earth-bound telescope is dominated by a familiar term proportional to the tangent of the zenith angle and proportional to the refractivity at the ground. The manuscript focuses on the torsion of the ray path through the atmosphere in a model of ellipsoidal atmospheric layers above the Earth surface, induced by the two slightly different principal curvatures along N-S and E-W pointing directions, depending on the geodetic latitude of the telescope site. This symmetry breaking effects apparent places in the sub-milliarcsecond range at optical and infrared wavelengths.

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