Water Production of Interstellar Comet 3I/ATLAS from SOHO/SWAN Observations after Perihelion
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917206047064064 |
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| author | Combi, M. R. Mâkinen, T. Bertaux, J. -L. Quemerais, E. Ferron, S. Lallement, R. Schmidt, W. |
| author_facet | Combi, M. R. Mâkinen, T. Bertaux, J. -L. Quemerais, E. Ferron, S. Lallement, R. Schmidt, W. |
| contents | The Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha camera on the Solar and Heliosphere Observatory (SOHO) observed the hydrogen coma of interstellar comet 3I/ATLAS, also called C/2025 N1 (ATLAS), beginning on November 6, 2025, 9 days after perihelion. Water production rates were calculated from each image of 3I/ATLAS using the methodology of Makinen & Combi (2005, Icarus 177, 217) and fluorescence rates, g-factors, calculated using the daily solar Lyman-alpha fluxes from the LASP database (https://lasp.colorado.edu/lisird/data) corrected for solar rotation and for the comet heliocentric velocity. The method has been used for over 90 comet apparitions (Combi 2022; Combi et al. 2019). A water production rate of 3.17 x 10^29 s^-1 was found on November 6 when the comet was at a heliocentric distance of 1.40 au and at a sufficient solar elongation angle. It decreased over time after that, down to 1-2 x 10^28 s^-1 around 40 days post-perihelion (December 9). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_22354 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Water Production of Interstellar Comet 3I/ATLAS from SOHO/SWAN Observations after Perihelion Combi, M. R. Mâkinen, T. Bertaux, J. -L. Quemerais, E. Ferron, S. Lallement, R. Schmidt, W. Earth and Planetary Astrophysics Astrophysics of Galaxies The Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha camera on the Solar and Heliosphere Observatory (SOHO) observed the hydrogen coma of interstellar comet 3I/ATLAS, also called C/2025 N1 (ATLAS), beginning on November 6, 2025, 9 days after perihelion. Water production rates were calculated from each image of 3I/ATLAS using the methodology of Makinen & Combi (2005, Icarus 177, 217) and fluorescence rates, g-factors, calculated using the daily solar Lyman-alpha fluxes from the LASP database (https://lasp.colorado.edu/lisird/data) corrected for solar rotation and for the comet heliocentric velocity. The method has been used for over 90 comet apparitions (Combi 2022; Combi et al. 2019). A water production rate of 3.17 x 10^29 s^-1 was found on November 6 when the comet was at a heliocentric distance of 1.40 au and at a sufficient solar elongation angle. It decreased over time after that, down to 1-2 x 10^28 s^-1 around 40 days post-perihelion (December 9). |
| title | Water Production of Interstellar Comet 3I/ATLAS from SOHO/SWAN Observations after Perihelion |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.22354 |