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Notes on Condon's calfind3.f and conversion to python

Herewith a description of Condon's calfind3.f program, referred to in the following MR.

Here are the steps it goes through.

Inputs to calfind3:

Relevant Inputs to AutoPeak/Focus


OK, Here are some details.

Note: In dealing with angles such as ra, dec, az, el, and sidereal times, you have to convert to radians before combining them or feeding them to trig functions. This is not going to be mentioned explicitly in the following.

The Calibrator Catalog

The angular distance

Source size and beam size criteria

Interpolate catalog flux density to the required frequency (fghz)

The catalog has flux densities at 1.4 GHz (S20) for all objects, but many of them are missing the data at one or more higher frequencies. Flux values are given as zero if missing. The interpolation has to deal with missing data.

The frequencies Fx = (1.4, 4.9, 8.6, 15.0, 22.0, 43.0) correspond to fluxes (S20, S6, S3.5, S2, S1.3, S0.7).

If calibrator passes all tests so far, then check move times.

If No Calibrator passes all tests, then relax the criteria.

Print info for all selected calibrators.


-- FrankGhigo - 01 Jul 2008

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