KI V2 Data Products
Ancilliary (.anc) FileDescription
Ancilliary files are ASCIItext files that contain ancilliary data to the sum and spec files. Thefollowing gives an example of a line from a KI anc file:
ANC 01/01/2004/04:42:05 4.701388 HDC12846 0.497 0.674 10506.4 0.174 1.582 1.646 328117.1 237813.2 20 1.0340 2.5803 0.0350 0.1200 1.0350 2.5900 0.0050 0.0180 1424.4 672 0.45 0.65 1221.4 672 0.45 0.65
The line consists ofa number of space-delimited fields. The meanings of these fields are summarizedin the table below. Each line corresponds to a block average of data (typically from 5 to 25 seconds of fringe data, not necessarily contiguous). All entries are mean values for the block. For ease of comparison with fringe data, someof the value from the summary file are repeated here. A # as theleading character indicates a comment. A value of 0 generally means thatthe data item was not available in the archive file.
| field# | content | comments |
|---|---|---|
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ANC | File identifier. Each line starts with ANC to supportthe grep extraction mechanism from the intermediate data file producedby the L1 reduction code (Kvis). |
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observation date | UTC date of the observation (dd/mm/yyyy/hh:mm:ss) |
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observation time | Mean observation time (decimal UTC hours) |
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source designation | Source designation |
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wideband incoherent V2 | Wideband visibility squared (dimensionless) |
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phase jitter | RMS phase difference between consecutive fringe samples(radians) |
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wideband flux | Fringe tracker flux in wideband channel.DN units (approximately 3 photons/DN) |
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wideband flux RMS | Fringe tracker flux RMS/mean for wideband channel |
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wideband flux ratio | Flux ratio (Keck 2/Keck 1) for fringe tracker wideband channel |
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composite SPEC flux ratio | Flux ratio (Keck 2/Keck 1) for spectrometer channels;average over spectrometer channels |
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star tracker flux (Keck 1) | Mean star tracker flux for Keck 1 (DN) |
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star tracker flux (Keck 2) | Mean star tracker flux for Keck 2 (DN) |
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star tracker frame rate | (Hz) |
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Keck 1 telescope azimuth | (radians) |
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Keck 1 telescope elevation | (radians) |
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Keck 1 telescope azimuth error | (radians) |
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Keck 1 telescope elevation error | (radians) |
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Keck 2 telescope azimuth | (radians) |
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Keck 2 telescope elevation | (radians) |
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Keck 2 telescope azimuth error | (radians) |
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Keck 2 telescope elevation error | (radians) |
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AO flux (Keck 1) | Mean wavefront sensor flux for Keck 1 |
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AO frame rate (Keck 1) | AO correction loop rate for Keck 1 (Hz) |
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AO DT gain (Keck 1) | AO tip-tilt loop gain for Keck 1 |
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AO DM gain (Keck 1) | AO deformable mirror loop gain for Keck 1 |
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AO flux (Keck 2) | Mean wavefront sensor flux for Keck 2 |
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AO frame rate (Keck 2) | AO correction loop rate for Keck 2 (Hz) |
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AO DT gain (Keck 2) | AO tip-tilt loop gain for Keck 2 |
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AO DM gain (Keck 2) | AO deformable mirror loop gain for Keck 2 |
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star tracker RMS (Keck 1) | Star tracker jitter RMS for Keck 1 |
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star tracker RMS (Keck 2) | Star tracker jitter RMS for Keck 2 |