Hubble Telescope Captures Comet Reversing Its Rotation for the First Time

For the primary time, astronomers have witnessed a comet absolutely reversing its rotation. NASA’s Hubble Space Telescope has recorded the behaviour of Comet 41P/Tuttle-Giacobini-Kresák throughout its shut strategy to the Sun in 2017. Planetary scientist David Jewitt of UCLA studied the Hubble observations and revealed his findings in The Astronomical Journal on March 26. The comet, which is a small icy physique simply 0.6 miles huge, considerably slowed down and got here to a whole cease earlier than reversing its rotation.

How Gas Jets Flip a Comet

According to the findings, Comet 41P’s nucleus is simply 0.6 miles (1 km) in diameter. This makes it extremely prone to rotational forces. When Comet 41P approached the Sun, the Sun’s heat brought on frozen ices to sublimate. This brought on unbalanced gasoline jets that behaved like mini-thrusters. NASA’s Swift Observatory detected that Comet 41P’s spin slowed down three times over in May 2017. Hubble photos taken in December revealed that it now rotates each 14 hours in reverse. Jewitt likened this to pushing a spinning merry-go-round in the other way till it stops and reverses.

A Comet on Borrowed Time

Such a spin reversal may result in the destruction of comet 41P. As it spins sooner, centrifugal forces may overcome the weak gravity binding it collectively, inflicting it to come back aside. The comet’s exercise has additionally decreased tenfold because it handed perihelion in 2001. The near-surface risky ice is probably going depleted or buried underneath mud. Having been in its present orbit for about 1,500 years, comet 41P is in its last phases. According to Jewitt, it’ll “very quickly self-destruct.” The proven fact that it’s an historic relic in our photo voltaic system makes it all of the extra poignant.