' Hartley passes

2 arcminutes to the south of the mag. +4.7 star Lambda (/.) Cassiopeiae at around midnight BST (23:00 UT). The comet is expected to be at mag. +6 at this time. Use binoculars or a small telescope with low magnification to see it.

Ak Chris Bramley "I'm going to visit my local astronomical society's observatory site this month, and hope to get a look a look at the Dumbbell Nebula through an 18-inch Obsession Dobsonian."

Graham Southorn "It's got to be Jupiter! The opportunity to see it at its best, plus Uranus sitting just above it, is going 1 to be irresistible."

Terms you need to know


Times are quoted in British Summer Time (BST), which is an hour ahead of GMT. Universal Time (UT) is the same time as GMT. RA (RIGHT ASCENSION) AND DEC. (DECLINATION) These co-ordinates are the night sky's equivalent of longitude and latitude, describing where an object lies on the celestial 'globe'.

Icons explained

How to tell what equipment you'll need

^J^r Allow 20 minutes to become dark-adapted

BINOCULARS 10x50 recommended

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