At any given time, there is usually one comet that can be observed in amateur telescopes. Comet Swan is a case in point and, since earlier this year, has been viewable from a dark site in just a pair of binoculars.
Interestingly enough, this one was discovered by a sun staring scope, the SOHO (SOlar Heliospheric Observatory), an Earth orbiter launched back in 1995. It has on board one instrument that sort of scans the entire solar system for solar Lyman alpha radiation that emanates from the Sun. So, SOHO has been doing double duty so to speak.
Comet Swan is a little on the strange side. Most of those that we see over time are periodic i.e. they return on a set timetable. For instance, Comet Halley returns every 76 years and I think it made a pass somewhere around 1986. A lot of us won't live to see the next pass it makes.
But some comets are non-periodic and have a strange trajectory that puts them in the solar system and then they shoot off into intergalactic space. Swan's trajectory is hyperbolic so once it leaves, we won't see it again...ever.
It's not too bright right now and will quickly fade over the next few weeks. Look for it around M13 in Hercules at the end of October.
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