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In-flight measurement of Planck telescope emissivity

Journal
EXPERIMENTAL ASTRONOMY
Date Issued
2019
Author(s)
CUTTAIA, FRANCESCO
•
TERENZI, LUCA
•
MORGANTE, GIANLUCA
•
SANDRI, MAURA
•
VILLA, FABRIZIO
•
•
•
•
•
Gregorio, A.
•
Delannoy, P.
•
Foley, S.
•
Gandolfo, B.
•
Neto, A.
•
Watson, C.
•
Pajot, F.
•
Bersanelli, M.
•
Butler, R. C.
•
Mandolesi, N.
•
Mennella, A.
•
Tauber, J.
•
DOI
Abstract
The Planck satellite in orbit mission ended in October 2013. Between the end of Low Frequency Instrument (LFI) routine mission operations and the satellite decommissioning, a dedicated test was also performed to measure the Planck telescope emissivity. The scope of the test was twofold: i) to provide, for the first time in flight, a direct measure of the telescope emissivity; and ii) to evaluate the possible degradation of the emissivity by comparing data taken in flight at the end of mission with those taken during the ground telescope characterization. The emissivity was determined by heating the Planck telescope and disentangling the system temperature excess measured by the LFI radiometers. Results show End of Life (EOL) performance in good agreement with the results from the ground optical tests and from in-flight indirect estimations measured during the Commissioning and Performance Verification (CPV) phase. Methods and results are presented and discussed.
Volume
47
Issue
1-2
Start page
107
Uri
Url
Issn Identifier
0922-6435
Ads BibCode
2019ExA....47..107C
Rights
open.access
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