#astronomy See the waxing Moon meet the outermost planet on 10 October – Astronomy Now

October 6, 2019 - Comment

The 12-day-old Moon lies in the identical low-power binocular area because the outermost planet late into the night of Thursday, 10 October 2019. At 11pm BST, observers within the UK can discover the pair highest within the southern sky towards the constellation of Aquarius. The glare of the gibbous lunar disc will current a problem, however look


The 12-day-old Moon lies in the identical low-power binocular area because the outermost planet late into the night of Thursday, 10 October 2019. At 11pm BST, observers within the UK can discover the pair highest within the southern sky towards the constellation of Aquarius. The glare of the gibbous lunar disc will current a problem, however look one-third of the best way from magnitude +four.2 star phi (φ) Aquarii to magnitude +5.four 83 Aquarii to search out the magnitude +7.eight ‘star’ that’s Neptune. This simulated view reveals area stars as faint because the planet. AN graphic by Ade Ashford.In an earlier observing story, I wrote about Neptune’s shut encounter with a magnitude +four.2 naked-eye star known as phi (φ) Aquarii within the first week of September. The outmost planet’s nice distance – at the moment some 29 occasions farther away from the Solar than Earth – signifies that its retrograde (east-to-west) movement towards the celebs of Aquarius is sluggish. Therefore even by the tip of October, Neptune lies not more than 1.three° (or two-and-a-half lunar diameters) from φ Aquarii.

Utilizing φ Aquarii as a stellar stepping stone to Neptune just isn’t too difficult, however in the event you’re in search of a extremely handy celestial marker to the outermost planet from the UK, look no additional than the waxing gibbous Moon on the night time of 10 October. At 11pm BST, the lunar orb lies simply 4½ levels under Neptune – barely lower than the sector of view of a typical 10×50 binocular. Nonetheless, to comfortably embody the Moon and planet requires an eight× or ideally a 7× instrument.

Neptune lies a staggering four,349 million kilometres from Earth on the night time of 10 October – nearly 10,800 occasions farther away than our Moon. Even on the velocity of sunshine, rays from the Solar mirrored from the cloud tops of the outermost recognized planet take 4 hours to journey throughout the Photo voltaic System to our eyes. At such an enormous distance, it’s maybe not stunning that Neptune takes nearly 165 years to orbit the Solar.



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