Possible causes's now stand at:
UFO, Galaxy, OTA intrusion, spider and exploding satellite.
Guys an girls, we have to get serious.
So I looked at the Zernike model of aberrations.
Circular wavefront profiles associated with aberrations may be mathematically modeled
using Zernike polynomials.
Developed by Frits Zernike in the 1930s, Zernike's polynomials are orthogonal over a circle of unit radius.
A complex, aberrated wavefront profile may be curve-fitted with Zernike polynomials to yield a set of fitting coefficients
that individually represent different types of aberrations....
Sorry, no i didn't, just fibbing :-)
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