Find a location that offers you an unobstructed view of the southeast about an hour before sunrise over the next week to see dazzling Venus close to the horizon. Look carefully and you’ll see that the brightest planet is not alone. Around 6:30am GMT on 15 November finds Venus just 1¼ degrees to the lower left of first-magnitude star Spica in the constellation of Virgo. What’s the minimum magnification that you need to see the planet’s crescent shape? AN illustration by Ade Ashford.
For the early risers among you, there’s an unmistakable planetary visitor currently gracing the dawn sky. Having passed inferior conjunction between Earth and the Sun on 26 October, Venus passed into the morning sky and has spent the intervening time slowing drawing away from the solar glare.
Unmistakably the brightest object in the dawn sky, magnitude -4.5 Venus presently rises more than two hours before the Sun for observers in the British Isles and may be found in the constellation Virgo low in the southeast an hour before sunrise. If you look carefully before the twilight grows too bright, you may spot that the planet has company.
On the UK morning of Thursday, 15 November 2018 at 6:30am GMT, Venus lies just 1¼ degrees from first-magnitude star Spica, Virgo’s principal luminary. Viewed through a telescope at this instant, Venus appears as an 11 percent illuminated crescent exceeding 52 arcseconds in diameter and lies 47.8 million kilometres (29.7 million miles) from Earth.
Owing to the planet’s large angular size at this time, a typical 10x binocular is sufficient to glimpse Venus’ crescent. What’s the minimum optical aid with which you can see it? Note that between now and dawn on 20 November, Venus lies 2 degrees or less from Spica, so be sure to make the most of any early morning viewing opportunities.