Comet 220P McNaught Puts On An Encore Performance

Comet 220P/McNaught has recently shown significant outbursts, with a large eruption in early June increasing its brightness by 10 magnitudes, an 8,000-fold increase, and another marked increase in early August by 600 times or about 7 magnitudes. These outbursts are among the most intense ever recorded for this comet, surpassing those of 17/P Holmes in 2007 and 289P/Blanpain in 2013. The comet is currently at +8th magnitude and is still holding steady at +9th magnitude in late August. The outbursts are causing considerable interest among astronomers and are expected to continue through the summer.

The comet is expected to make its closest approach to Earth on October 12th, at 1.043 AU distant. It is also passing through the inner solar system on June 14th, at 1.6 AU from the Sun, and will reach aphelion on March 12th, 2029, at 4.679 AU from the Sun. The comet is a Jupiter-family member with a 5.5-year orbit and is currently loitering in the dawn sky, with its path through the constellation Cetus in the last half of 2026. It will loop in and out of the Circlet of Pisces asterism, circling the +2.5 magnitude star Alpha Ceti (Menkar), and will be visible in the pre-dawn hours through August into September and October for northern hemisphere observers.

The comet's activity and brightness changes are considered a natural part of its periodic orbit, and its outbursts are seen as a "multi-personality" phenomenon, with its coma and tail changing appearance from night to night. The comet is currently visible to the naked eye at +9th magnitude and is expected to continue its journey into the fall, with its final act for 2026 possibly yet to come.

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