See Comet Catalina pass overhead from UK when closest to Earth

Having brushed by bright star Arcturus on 1 January, Comet Catalina (C/2013 US10) continues its trek through the constellations of the far north. Now a circumpolar object for the British Isles, in the early hours of 17 January it lies between famous double star Mizar (ζ Ursae Majoris) and the Pinwheel Galaxy (M101), virtually overhead in the UK.

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A galaxy at the centre of the Hubble Tuning Fork

Markarian 820, also known as Mrk 820, LEDA 52404 or IRAS F14379+3142, is a lenticular galaxy in the constellation Boötes, about 300 million light-years from Earth. Galaxies like this one are in the transition zone between ellipticals and spirals and lie right where the fork divides in American astronomer Edwin Hubble’s classification scheme of galaxies from 1926.