Comet and supermoon to pair up for celestial spectacle
The third of four supermoons this year, it will be 222,055 miles (357,364 kilometers) away Wednesday night, making it seem even bigger and brighter than in August and September. It will reach its full lunar phase Thursday.
In a twist of cosmic fate, a comet is in the neighborhood. Discovered last year, comet Tsuchinshan-Atlas is now prominent in the Northern Hemisphere after wowing stargazers in the Southern Hemisphere.
The moonlight will wash out some of the comet's tail, but it's still worth a look after sunset, said NASA's Bill Cooke.
'Most astronomers hate the full moon because its bright light messes up observing other objects. So it's a bit hard for us to wax poetic about it even if it's the biggest supermoon of 2024,' he said in an email.
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Better catch the comet; it may never return. But don't fret if you miss Thursday's supermoon. The fourth and final supermoon of the year will rise on Nov. 15.
More a popular term than a scientific one, a supermoon occurs when a full lunar phase syncs up with an especially close swing around Earth. This usually happens only three or four times a year and consecutively, given the moon's constantly shifting, oval-shaped orbit.
A supermoon obviously isn't bigger, but it can appear that way, although scientists say the difference can be barely perceptible.
There's a quartet of supermoons this year.
The one in August was 224,917 miles (361,970 kilometers) away. September's was nearly 3,000 miles (4,484 kilometers) closer the night of Sept. 17 into the following morning. A partial lunar eclipse also unfolded that night, visible in much of the Americas, Africa and Europe as Earth's shadow fell on the moon, resembling a small bite.
October's supermoon is the year's closest at 222,055 miles (357,364 kilometers) from Earth, followed by the November supermoon at a distance of 224,853 miles (361,867 kilometers).
Scientists point out that only the keenest observers can discern the subtle differences. It's easier to detect the change in brightness — a supermoon can be 30% brighter than average.
With the U.S. and other countries ramping up lunar exploration with landers and eventually astronauts, the moon beckons brighter than ever.
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