Preprints
https://doi.org/10.5194/egusphere-2023-1383
https://doi.org/10.5194/egusphere-2023-1383
10 Jul 2023
 | 10 Jul 2023

Multi-star calibration in starphotometry

Liviu Ivănescu and Norman T. O'Neill

Abstract. We explored the improvement in starphotometry accuracy using a multi-star Langley calibration in lieu of the more traditional one-star Langley approach. Our goal was a 0.01 calibration-constant repeatability accuracy, at an operational sea-level facility such as our Arctic site at Eureka. Multi-star calibration errors were systematically smaller than single star errors and, in mid-spectrum, approached the 0.01 target for an observing period of 2.5 h. Filtering out coarse mode (super µm) contributions appears mandatory for improvements. Spectral vignetting, likely linked to significant UV/blue spectrum errors at large airmass, may be due to limiting field-of-view and/or sub-optimal telescope collimation. Starphotometer measurements acquired by instruments that have been designed to overcome such effects may improve future star magnitude catalogues and consequently starphotometry accuracy.

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Journal article(s) based on this preprint

22 Dec 2023
Multi-star calibration in starphotometry
Liviu Ivănescu and Norman T. O'Neill
Atmos. Meas. Tech., 16, 6111–6121, https://doi.org/10.5194/amt-16-6111-2023,https://doi.org/10.5194/amt-16-6111-2023, 2023
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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The starphotometers complex infrastructure prohibits calibration campaigns. On-site calibration...
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