论文标题
彗星41p/tuttle-giacobini-kresak，45p/honda-mrkos-pajdusakova和46p/wirtanen：21年以上的水生产活动
Comet 41P/Tuttle-Giacobini-Kresak, 45P/Honda-Mrkos-Pajdusakova, and 46P/Wirtanen: Water Production Activity over 21 Years with SOHO/SWAN
论文作者
论文摘要
在2017年，2018年和2019年，彗星46p/wirtanen，45p/honda-mrkos-pajdusakova和41p/tuttle-tuttle-giacobini-kresak均具有围绕围栏通道。 Their hydrogen comae were observed by the Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha Camera on the SOlar and Heliospheric Observer (SOHO) satellite: comet 46P for the fourth time and comets 45P and 41P for the third time each since 1997. Comet 46P/Wirtanen is one of a small class of so-called hyperactive comets whose gas production rates belie their small 尺寸。该彗星是罗塞塔任务的原始目标彗星。太阳能风向运动（天鹅）在太阳能和地球层观察者（SOHO）卫星上的全天空氢α-Alpha摄像头观察到1997年，2002年，2008年和2018年的幻影中的46p/wirtanen氧气昏迷在22年中，其活动的差异很大，这是一定的距离，并在其范围内进行了更改的距离，并在此范围内进行了相似的范围。彗星，103p/hartley 2。彗星45p/honda-mrkos-pajdusakova在2001年，2011年和2017年的周期幻影期间观察到。在这段时间内，活动水平仍然非常相似，没有长期的褪色或突然减少。天鹅在其2001年，2006年和2017年的围栏幻影中观察到彗星41p/tuttle-giacobini-kresak，在同一时期的活动显着下降。 1973年，它以大规模爆发而闻名，该爆发继续在2001年（2次爆发）和2006年（1次爆发）幻影。但是，在2001年至2017年的时间段内，SOHO/SWAN观测值涵盖的时间在其轨道期间的相应时间比10-30的因素大大降低了。
In 2017, 2018 and 2019, comets 46P/Wirtanen, 45P/Honda-Mrkos-Pajdusakova, and 41P/Tuttle-Giacobini-Kresak all had perihelion passages. Their hydrogen comae were observed by the Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha Camera on the SOlar and Heliospheric Observer (SOHO) satellite: comet 46P for the fourth time and comets 45P and 41P for the third time each since 1997. Comet 46P/Wirtanen is one of a small class of so-called hyperactive comets whose gas production rates belie their small size. This comet was the original target comet of the Rosetta mission. The Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha camera on the SOlar and Heliospheric Observer (SOHO) satellite observed the hydrogen coma of comet 46P/Wirtanen during the apparitions of 1997, 2002, 2008 and 2018. Over the 22 years, the activity decreased and its variation with heliocentric distance has changed markedly in a way very similar to that of another hyperactive comet, 103P/Hartley 2. Comet 45P/Honda-Mrkos-Pajdusakova was observed by SWAN during its perihelion apparitions of 2001, 2011 and 2017. Over this time period the activity level has remained remarkably similar, with no long-term fading or abrupt decreases. Comet 41P/Tuttle-Giacobini-Kresak was observed by SWAN in its perihelion apparitions of 2001, 2006 and 2017 and has decreased in activity markedly over the same time period. In 1973 it was known for large outbursts, which continued during the 2001 (2 outbursts) and 2006 (1 outburst) apparitions. However, over the 2001 to 2017 time period covered by the SOHO/SWAN observations the water production rates have greatly decreased by factors of 10-30 over corresponding times during its orbit.
