Details

Autor(en) / Beteiligte

• Combi, M.R.
• Mäkinen, T.
• Bertaux, J.-L.
• Quémerais, E.
• Ferron, S.

Titel

Water production rates from SOHO/SWAN observations of comets C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS)

Ist Teil von

• Icarus (New York, N.Y. 1962), 2023-07, Vol.398 (July), p.115543, Article 115543

Ort / Verlag

Elsevier Inc

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• In 2021 and 2022 the hydrogen comae of three long period comets, C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS) were observed with the Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha camera on the SOlar and Heliosphere Observer (SOHO) satellite. SWAN obtains nearly daily full-sky images of the hydrogen Lyman-α distribution of the interstellar hydrogen as it passes through the solar system yielding information about the solar wind and solar ultraviolet fluxes that eats away at it by ionization and charge exchange. The hydrogen comae of comets, when of sufficient brightness, are also observed. Water production rates have been calculated over time for each of these comets. Of particular interest are comet C/2021 O3 (PanSTARRS) which apparently disintegrated a few days before its perihelion at 0.28 au and C/2021 A1 (Leonard) which also disintegrated beginning about 20 days after its perihelion peak. The behavior of comet C/2020 S3 (Erasmus) was more typical without dramatic fading, but still was asymmetric about perihelion, with a more rapid turn on before perihelion and more extended activity well after perihelion. •SOHO SWAN obtained images of H Lyman-α in 3 long-period comets from 2020 to 2022.•The water production rate was calculated for each comet image.•Comet C/2020 S3 (Erasmus) varied asymmetrically around perihelion.•Comets C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS) disintegrated at radii of 121–192 m.