On Sunday, 26 May at 21:17 UT, 1 Ceres, the nearest and brightest of the dwarf planets and the largest minor planet inside the orbit of Neptune, passed closest to Earth for this year. At this instant, Ceres was 1.7513 astronomical units, or 262 million kilometres (162.8 million miles) from our planet.
Ceres presently lies in the constellation of Ophiuchus, the Serpent Bearer, but the dwarf planet’s westerly motion relative to the stars carries it into Scorpius on 29 May where it resides until 22 June.Ceres reaches opposition close to 12am BST on 29 May and shines at its peak magnitude of +7.0 for 2019, fading to +7.8 by the end of June, hence it’s a comfortable binocular or small telescope target — if you know exactly where to look. Click here for a printable PDF version of the finder chart at the top of the page.
As viewed from the UK, Ceres is currently highest in the sky close to 1am BST, or by 10:30pm BST at the end of June, when the dwarf planet is just 18 degrees high in the south as seen from the centre of the British Isles.
Ceres is also occulted (hidden) by the Moon on 15 June as seen from Russia (central and east), Kazakhstan (northeast), China (north and east) and Japan.
When 252P/LINEAR passed just 14 lunar distances from Earth on 21 March, the comet was galloping across the far southern sky at a rate of almost ten degrees per day. Now rapidly heading north, 252P finally appears in the predawn UK sky. While moonlight will interfere with current observations, the comet is much brighter than predicted.
This feature appears to be a frozen, former lake of liquid nitrogen, located in a mountain range just north of Pluto’s informally named Sputnik Planum. Captured by the New Horizons’ Long Range Reconnaissance Imager (LORRI) as the spacecraft flew past Pluto on 14 July 2015, the image shows the possible lake to be about 20 miles (30 kilometres) across.
During the Perseid meteor shower, second-largest asteroid 2 Pallas passed close to the southeast of globular cluster Messier 15 in the constellation of Pegasus. The minor planet still lies in the vicinity of this beautiful deep-sky object, reaching opposition on 20 August — here’s our in-depth guide to Pallas at its best.