A rare green comet that was seen around 50,000 years ago is expected to make its closest pass by Earth.
Named C/2022 E3 (ZTF), the comet comes from the Oort cloud which is part of the outermost edge of the Solar System.
The celestial object is seen every 50,000 years, meaning that the last time it passed Earth was during the Stone Age.
But on Wednesday, February 1, the comet will come close to Earth, within about 45 million kilometres.
Comet 2022 E3 ZTF imaged this morning from Wiltshire.#astronomy #Astrophotography #Wiltshire pic.twitter.com/TiP2elPYHs
— Astro Mike 🔭 🇬🇧 (@xRMMike) January 27, 2023
Dr Greg Brown, an astronomer at the Royal Observatory Greenwich, told the PA news agency: “Long-period comet C/2022 E3 is currently speeding through the solar system and won’t return for at least 50,000 years, assuming it ever does, so it’s your once-in-a-lifetime chance to see it.
“Its path across our sky is taking it through the constellation of Draco the dragon and will be passing between the two bears, Ursa Major and Ursa Minor, in late January and into early February.”
The comet was first spotted back in March 2022 using the Zwicky Transient Facility in California.
The icy ball's green glow is a result of ultraviolet radiation from the sun lighting up the gases surrounding the comet’s surface.
C/2022 E3 has recently become bright enough to see with the naked eye in areas with minimal light pollution.
How to see the comet on February 1
Dr Brown told PA: “While it may yet become possible to see it with the unaided eye from an extremely dark site, you are much better off pointing a pair of binoculars or a small telescope at it.
“For observers in the UK, head out after midnight when the comet will be highest in the sky and try and find the faint greenish light coming from it.
“Easiest to see will be the brighter head of the comet, but, if you are lucky, you may spot one of its two tails sweeping out from it, each made of material being jettisoned from its rapidly warming icy surface.”
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules here