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FAST Observations of Four Comets to Search for the Molecular Line Emissions between 1.0 and 1.5 GHz Frequencies

Tsai, Chao-Wei; Duan, Yan; Li, Di +11 more

We used the Five-hundred-meter Aperture Spherical radio Telescope (FAST) to search for the molecular emissions in the L-band between 1.0 and 1.5 GHz toward four comets, C/2020 F3 (NEOWISE), C/2020 R4 (ATLAS), C/2021 A1 (Leonard), and 67P/Churyumov-Gerasimenko during or after their perihelion passages. Thousands of molecular transition lines fall i…

The role of astronomical silicates during a cometary outburst

Wesołowski, Marcin

This paper presents a new approach to analyzing the change of cometary brightness. In our considerations, we assume that astronomical silicates (dust agglomerates) and gas are present in the coma. This assumption is a consequence of the analysis of the result observed during the Rosetta mission to comet 67P/Churyumov-Gerasimenko (abbreviated 67P/C…

Reducing loss of significance in the computation of Earth-based two-way Doppler observables for small body missions

Li, Fei; Ye, Mao; Barriot, Jean-Pierre +5 more

Two-way Doppler measurement is a typical Earth-based radiometric technique for interplanetary spacecraft navigation and gravity science investigation. The most widely used model for the computation of two-way Doppler observables is Moyer's differenced-range Doppler (DRD) formula, which is based on a Schwarzschild approximation of the Solar-System …