Comet 252P/LINEAR

This sequence of images taken by the NASA/ESA Hubble Space Telescope shows Comet 252P/LINEAR as it passed by Earth. The visit was one of the closest encounters between a comet and our planet.

The images were taken on 4 April, 2016, roughly two weeks after the icy visitor made its closest approach to Earth on 21 March. The comet traveled within 5.3 million kilometres of Earth, or about 14 times the distance between our planet and the Moon. These observations also represent the closest celestial object Hubble has observed, other than the Moon.

The images reveal a narrow, well-defined jet of dust ejected by the comet's icy, fragile nucleus. The nucleus is too small for Hubble to resolve. Astronomers estimate that it is about one kilometre across. A comet produces jets of material as it travels close to the Sun in its orbit. Sunlight warms ices in a comet's nucleus, resulting in large amounts of dust and gas being ejected, sometimes in the form of jets. The jet in the Hubble images is illuminated by sunlight.

The jet also appears to change direction in the images, which is evidence that the comet's nucleus is spinning. The spinning nucleus makes the jet appear to rotate like the water jet from a rotating lawn sprinkler. The images underscore the dynamics and volatility of a comet's fragile nucleus.

Comet 252P/LINEAR is traveling away from Earth and the Sun; its orbit will bring it back to the inner Solar System in 2021, but not anywhere close to Earth.

These visible-light images were taken with Hubble's Wide Field Camera 3.