The material which produces meteor showers results from dust particles which sublimate from a comet when it passes through…
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When Will the Next Bright Comet be Visible from the Northern Hemisphere?
Japanese comet enthusiast Seiichi Yoshida has provided a very nice list of visible comets from the Northern Hemisphere (also…
Background Lights in Comet NEOWISE Video
If you are referring to this video posted by CBS News and created by Sean Doran, I believe what…

How to Interpret the Observation Date Format from the Minor Planet Center (MPC)
I believe that the observation date format which includes a decimal on the day value indicates fractions of a…

How to Calculate the Orbital Period of a Comet Given its Closest and Furthest Orbital Distance
Given the minimum and maximum distance of the orbit of a comet in an elliptical orbit, you can use…

A Question About Comet Orbits
Comets have orbits which are highly elliptical, with their closest approach (perihelion) lasting only a few months. I don’t…