A fairly uncommon observational occasion seen throughout the entire of the UK, a planet occulted by the Moon, happens on the early-evening of 5 December when the Moon strikes over Uranus, the ice-giant seventh planet. This will likely be Uranus’ second occultation occasion seen from the UK this yr, following September’s episode.
Uranus, shining at magnitude +5.7, is at present well-placed within the night sky among the many stars of Aries (1.5° south-south-east of magnitude +5.3 pi Arietis), having been at its opposition finest simply final month.
The excellent news is {that a} a humble pair of 10 x 50 binoculars is all that’s required to view this thrilling occultation, with Uranus’ disappearance and reappearance observable with the Moon at a cushty altitude.
Uranus strikes behind the darkish limb of a 94.3-per cent-illuminated waxing gibbous Moon at 4.45pm GMT from London, 4.49pm in Birmingham, 4.52pm in Manchester and 4.59pm from Edinburgh. Uranus and the Moon are rising within the jap sky and lay round 20 levels excessive at occultation time.
The Moon reappears on the Moon’s vivid limb at about 5.20pm and 5.22pm from London and Edinburgh, respectively.
Why not spend a while observing Uranus after the occultation is over? It’s observing circumstances from UK shores are bettering year-on-year because it seems larger within the northern sky. With its declination now a beneficial 16 levels north for observers from mid-northern latitudes, Uranus climbs to a lovely altitude of fifty levels or so when it culminates (crosses the southern meridian at its peak altitude) at about 10pm GMT.
Uranus is a simple seize via a pair of 10 x 50 binoculars, whereas a telescope within the 80–100mm (~three- to four-inch) aperture class, giving a magnification of not less than 100x, can present its 3.7-arcsecond-diameter blue-green disc.
