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Comet 46P/Wirtanen next perihelion 2024-May-19

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Comet 46P/Wirtanen is a n icy   small Solar System body  that, when passing close to the  Sun , will warm and begin to release gases, a process called  outgassing . This produces a visible atmosphere or  coma , and also a  tail . These phenomena are due to the effects of  solar radiation  and the  solar wind  acting upon the nucleus of the comet. However, this time around, the ion tail will be pointing  away from the Earth and difficult to see due to the geometry. It will hopefully improve as the comet approaches perihelion (19 May 2024). The Comet 46P/Wirtanen nucleus is approximately 1.2  kilometers diameter (example distance & size shown above) and is composed of loose collections of ice, dust, and small rocky particles. Although actual sizes are yet to be determined, the coma may be up to 15 times the Earth's diameter, while the tail may stretch one  astronomical unit . Expected to be sufficien...
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Ephemeris

Ephemeris From Wikipedia, the free encyclopedia In  astronomy  and  celestial navigation , an  ephemeris  (plural:  ephemerides ; from  Latin   ephemeris , meaning 'diary', from  Greek  εφημερίς  (ephemeris) , meaning 'diary, journal'  [1] [2] [3] [4] ) gives the positions of naturally occurring  astronomical objects  as well as  artificial satellites  in the  sky  at a given  time  or times. Historically, positions were given as printed  tables  of  values , given at regular intervals of date and time. Modern ephemerides are often computed electronically from mathematical models of the motion of astronomical objects and the Earth. Even though the calculation of these tables was one of the  first applications of mechanical computers , printed ephemerides are still produced, as they are useful when computational devices are not available. The astronomical position ...
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December 12-16, 2018

On December 12, 2018 Comet 46P/Wirtanen  will pass the sun at it's closest distance of 157,878,113 Kilometers (98,100,911 Miles).  Just four days later, on December 16, 2018 it will come closest to Earth at 11,622,258 Kilometers (7,221,736 Miles).  On it's closest approach, it's expected to reach naked-eye brightness.
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