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Title - Radial Distribution of the Dust Comae of Comets 45P and 46P/Wirtanen
By - C Lejoly et al, 2021
Summary - .
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Title - Nondetection of Water-ice Grains in Coma of Comet 46P & Implications for Hyperactivity
By - Silvia Protopapa et al, 2021 (Michael Kelley)
Summary - 46P / Wirtanen is a small short-period comet with a current orbital period of 5.4 years & estimated diameter of 1.2 km. In December 2019, an outburst of the comet was captured in substantial detail by the TESS space telescope. Water-ice spectral signature was missing in the observations, taken around perihelion and closest approach to Earth. The data spans a range of heliocentric distance from 1.1 au inbound, to 1.05 au near perihelion, and back to 1.1 au outbound. Coma is composed of porous refractory aggregates spanning 1.1–100 μm in diameter. An upper limit of 1.4% in water-ice abundance is estimated.
Although Wirtanen came closest to Earth on Dec 16, 2018, the outburst occurred earlier in its approach, beginning on Sept 26, 2018. The initial brightening of the outburst occurred in 2 distinct phases, with an hour-long flash followed by a more gradual second stage that continued to grow brighter for another 8 hours. After reaching peak brightness, the comet faded gradually over a period of more than 2 weeks.
News - My thread on it, Thread 2, NASA article
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Title - First Results from TESS Observations of Comet 46P/Wirtanen
By - Tony Farnham et al, 2019 (Michael Kelley, Matthew Knight)
Summary - .
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Title - Ice, Ice, Maybe? Investigating 46P/Wirtanen's Inner Coma for Icy Grains
By - Theodore Kareta et al, 2023 (Alessondra Springmann)
Summary - Checkout my thread below, exposing the silence of all 4 scientists & their pseudoscientific claims.
News - Thread by Theodore Kareta, AAS NOVA article, My Thread
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By - Mathew Knight et al, 2021
Summary - Overall production of volatile species has been dropping consistently since at least the 1990s.
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By - Combi et al, 2020
Summary - Observation of water production rate drop.
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Title - Activity on the surface of the nucleus of comet 46P/Wirtanen
By - Groussin et al, 2003
Summary - Comet 46P had an active fraction between 70% and 100% within 1.5 au during its 1996–1997 apparition, sustaining 100% throughout its perihelion passage.
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Title - Narrowband photometric results for comet 46P/Wirtanen
By - Tony Farnham & Schleicher, 1998
Summary - .
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Title - The nucleus and inner coma of Comet 46P/Wirtanen
By - Lamy et al, 1998
Summary - .
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Title - Terrestrial deuterium-to-hydrogen ratio in water in hyperactive comets
By - Dariusz Lis et al, 2019
Summary - .
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