Multi-star calibration in starphotometry

Autor: L. Ivănescu, N. T. O'Neill
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Atmospheric Measurement Techniques, Vol 16, Pp 6111-6121 (2023)
Druh dokumentu: article
ISSN: 1867-1381
1867-8548
DOI: 10.5194/amt-16-6111-2023
Popis: 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 the mid-spectrum, approached the 0.01 target for an observing period of 2.5 h. Filtering out coarse-mode (supermicrometre) contributions appears mandatory for improvements. Spectral vignetting, likely linked to significant UV/blue spectrum errors at large air mass, may be due to a 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.
Databáze: Directory of Open Access Journals
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje