On Sunday, 29 March around civil dusk (some 40 minutes after sunset), observers throughout the British Isles with binoculars and small telescopes can watch magnitude +3.5 naked-eye star Epsilon (ε) Tauri disappear behind the darkened hemisphere of the almost 5-day-old waxing crescent Moon. Then, about 70 minutes later, UK skywatchers have the slightly more challenging job of seeing the star reappear at the bright lunar limb. Precise times depend on where you live in the British Isles as illustrated above and explained below. AN graphic by Ade Ashford.As a gentle reminder for those of us living in the UK, British Summer Time starts at 1:00am GMT on Sunday, 29 March 2020 when the clocks go forward one hour. On that date, sunset for an observer in the heart of the UK will be 7:41pm BST. While keen observers will grumble at the prospect of waiting 60 minutes longer for darkness to fall, some solace may be found in viewing an interesting lunar occultation occurring on the first night of daylight savings time.
Epsilon (ε) Tauri is a magnitude +3.5 naked-eye star that has the proper name Ain. It is easily found almost 3.2 degrees to the northwest of first-magnitude Aldebaran, the brightest star in the constellation of Taurus, amid the stars of the loose open cluster known as the Hyades. Aldebaran, Ain and the Hyades conveniently fit in the same binocular field of view at magnifications of 10× or less. Physically, ε Tauri is an orange giant star some 147 light-years distant attended by a super-Jupiter exoplanet called Epsilon Tauri b, formally named Amateru.The disappearance of Epsilon (ε) Tauri, otherwise known by the proper name Ain, at the darkened lunar limb on 29 March shouldn’t be too challenging for UK-based owners of 10× magnification binoculars and larger provided you steady the view by leaning your elbows on a low wall or fence. In any small telescope, it’s an easy observation to make. Timing, however, is everything and that depends on where you live. AN graphic by Ade Ashford.As illustrated at the top of this page, observers in the north of Great Britain will see an almost central occultation of Ain on 29 March 2020. As viewed from Aberdeen, the star winks out of sight behind the darkened edge of the advancing Moon close to 8:13½pm and reappears at the bright lunar limb a few seconds after 9:23pm, hence the event’s duration is close to 70 minutes. Some 770 kilometres to the south in Plymouth, ε Tauri is hidden from 8:20¼pm to 9:28⅔pm, while those in Cardiff will see the star’s disappearance at 8:19½pm and reappearance at 9:28⅔pm. Londoners can expect to see an occultation of Ain lasting from 8:22½pm until 9:30¾pm (all times British Summer Time).
For three evenings from 26–28 February 2020, observers in Western Europe including the British Isles can watch the waxing crescent Moon’s changing configuration with brightest planet Venus in the west-southwest at dusk. The pair are closest for UK-based observers on the evening of Thursday, 27 February, simultaneously visible in low-power binoculars.
Observers in the UK will find Venus almost directly below the three-day-old Moon low in the south-southwest in deep twilight an hour after sunset on 3 December. The pair will fit in the same field of view of most 8x and 7x binoculars, but a deep-sky treat lies in store for telescope users.
At 6am GMT on the mornings of 3 and 4 February, around the onset of astronomical twilight for the centre of the British Isles, the old waning crescent Moon brushes by ringed planet Saturn low to the south-southeast horizon. As a bonus for telescope users, the Moon occults globular cluster M9 shortly after 6am GMT on 4 February too.
