英仙座流星正在路上-但有一个大问题

它经常带来地球夜空中最明显的年度流星雨之一，并将在 8 月 12 日至 13 日达到顶峰。 通常情况下，它在其高度每小时会呈现 50-100 颗“星星”，使其成为一场令人印象深刻的表演。 今年只有一个问题：满月。

“可悲的是，今年的英仙座流星雨高峰将对观察者来说是最糟糕的情况，”他说。[{” attribute=””>NASA astronomer Bill Cooke, who leads the Meteoroid Environment Office at NASA’s Marshall Space Flight Center in Huntsville, Alabama. “Most of us in North America would normally see 50 or 60 meteors per hour,” he said, “but this year, during the normal peak, the full Moon will reduce that to 10-20 per hour at best.”

Because the Moon is so much brighter than anything else in the night sky, it will wash out all but the very brightest Perseids as they streak through our atmosphere and burn up far overhead.

A shower of Perseid meteors lights up the sky in 2009 in this NASA time-lapse image. Credit: NASA/JPL

As the full Moon subsides, the Perseids will begin to weaken around August 21-22 and cease completely by September 1. They’re the debris remnants of Comet Swift-Tuttle, a lumbering “snowball” composed of ice, rock, and dust, which orbits our Sun every 133 years. The comet itself was last visible to us in 1992 and won’t pass our way again for over 100 years: not until 2125.

How far back sightings of the Perseids actually go remains a matter of some disagreement, Cooke said. The comet itself wasn’t identified until 1862, but the meteor shower was seen over medieval Europe. The annual event came to be known as “the Tears of St. Lawrence,” named for the last of seven Roman church deacons martyred by the emperor Valerian in August of the year 258.

So, while this is probably not the best year to make a special trip in order to see the Perseids, if you find yourself outside between midnight and dawn on August 13, don’t forget to look up anyway.  Because you never know – you might just catch one of the bright Perseid meteors that defies the glare of the Moon. Also, be aware that the occasional early Perseid can streak across the sky as much as a week beforehand.

If you want to know what else is in the sky for August 2022, check out the latest “What’s Up” video from Jet Propulsion Laboratory:

2022 年 8 月的观星活动有哪些亮点？ 用肉眼观察四颗行星的日常观察今天上午结束。 但是仍然有很多很棒的功能，特别是如果您可以使用双筒望远镜。 加，[{” attribute=””>Saturn and Jupiter are returning to nighttime skies! The outlook for the Perseid meteors isn’t great due to a full moon on the peak night of August 12, but still it’s worth keeping an eye out for early Perseids after midnight the week before. And August is a great month to learn an easy-to-spot constellation – Cygnus the swan.