Water production rates from SOHO/SWAN observations of comets C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS)
Water production rates from SOHO/SWAN observations of comets C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS)
复制标题
SOHO/SWAN 观测彗星 C/2020S3 (Erasmus)、C/2021 A1 (Leonard) 和 C/2021 O3 (PanSTARRS) 的产水率
DOI：
10.1016/j.icarus.2023.115543
复制
发表时间：
2023
期刊：
影响因子：
3.2
通讯作者：
S. Ferron
中科院分区：
文献类型：
--
作者：
M. Combi;T. Makinen;J. Bertaux;E. Quémerais;S. Ferron
在2021年和2022年，利用SOHO （Solar and Heliosphere Observer）卫星上的“太阳风各向异性”（SWAN）全天空氢莱曼- α相机，对C/2020 S3 （Erasmus）、C/2021 A1 （Leonard）和C/2021 O3 （PanSTARRS）三颗长周期彗星的氢彗发进行了观测。SWAN几乎每天都能获得星际氢在穿越太阳系时的莱曼α氢分布的全天图像，从而获得太阳风和太阳紫外线通量的信息，这些信息是通过电离和电荷交换来吞噬它的。当彗星有足够的亮度时，也可以观察到彗星的氢彗发。随着时间的推移，这些彗星的产水速率已经被计算出来。特别令人感兴趣的是C/2021 O3 （PanSTARRS）彗星，它在近日点0.28天文单位前几天明显解体，而C/2021 A1 （Leonard）彗星也在近日点峰值后约20天开始解体。彗星C/2020 S3 （Erasmus）的行为更典型，没有明显的褪色，但在近日点仍然是不对称的，在近日点之前更快速地开始，在近日点之后更持久地活动。
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.