Perhaps you’ve been excited by observations of Comet 12P\/Pons-Brooks<\/a>, but that comet is now fading from Northern Hemisphere skies.<\/p> Well, no promises, but towards the end of 2024 we might have a comet in the sky as bright as E3 was, or brighter.<\/p> If the most optimistic predictions are to believed it might even be the best comet for a long time. There are even whispers of it being a Great Comet!<\/p> But calm down. It\u2019s far too soon to be making predictions like that.<\/p> The past couple of nights, 24\/25 April, have been very clear up here in Kendal, Cumbria, UK, allowing me to take more images of Comet C\/2023 A3 (Tsuchinshan-ATLAS).<\/p> At the moment the comet is a late evening object for northern observers, drifting slowly westwards through the zodiacal constellation of Virgo, passing north of the constellation’s brightest star, first magnitude Spica, and just beneath 3rd magnitude Heze.<\/p> The comet is still very dim, shining – if that’s the right word – at around tenth magnitude, but it is easily found in small telescopes and can now be imaged with just a DSLR camera and long lens, tracking the stars to take long exposures.<\/p> It is now very clearly a fuzzy, non-stellar object in such photos, and even appears slightly elongated, hinting at the presence of a short tail.<\/p> Images taken through large telescopes using much more sophisticated cameras do indeed show such a tail – a promising sign, considering the comet is still so far away, halfway between Mars and Jupiter in fact.<\/p> Over the next few weeks the comet will continue to move through Virgo until it crosses the border into the deep south of the neighbouring constellation of Leo in mid-June.<\/p> By then it will best be seen after midnight, low in the south-west, but will still be much too faint to see with the naked eye.<\/p> What will this icy visitor do as it rounds the Sun in September? How bright could it become then?<\/p> That’s what we’d all like to know, but there’s no sure way of knowing.<\/p> That’s why it’s important to keep a close eye on the comet now, to gather as much information as possible.<\/p> So if your sky is clear over the next week or so get out there, find Virgo, and look for Comet C\/2023 A3 (Tsuchinshan-ATLAS) close to it with your camera or telescope.<\/p> And cross your fingers that it doesn’t let us down in the Autumn\u2026<\/p> The ball of ice and dust that has eyebrows raising and hopes rising is called C\/2023 A3 (Tsuchinshan-ATLAS).<\/p> It was spotted in February 2023 during a sky survey performed by ATLAS \u2013 the Asteroid Terrestrial-impact Last Alert System<\/a> \u2013 using the 0.5-m f\/2 Schmidt reflector telescope operated at the Sutherland Observatory in South Africa.<\/p> Back then it was an uninspiring 18th<\/sup> magnitude spot on a photo and was given the equally uninspiring name ‘A10SVYR’.<\/p> When its orbit was calculated it was noticed it had already been spotted by the Purple Mountain Observatory in China on 9 January 2023, when it was magnitude 18.7.<\/p> Follow-up observations revealed A10SVYR had a short tail, so it was designated a comet.<\/p> Following the long-established naming convention it was given a name honouring both its discoverers: C\/2023 A3 (Tsuchinshan\u2013ATLAS).<\/p> As Comet 12P\/Pons-Brooks is now fading from Northern Hemisphere skies as of April 2024, comet-chasers are thinking about A3, which could be a beautiful sight come autumn.<\/p> Comet A3\u2019s orbit will bring it close enough to both the Sun and the Earth in September\/October 2024.<\/p> There is good chance it will be visible to the naked eye, and has the potential<\/i> to be a bright naked-eye comet.<\/p> It\u2019s easy to get carried away by this, but perhaps understandable. It\u2019s far too long since we had a really bright comet in the sky.<\/p> You might remember how beautiful Comet Hale-Bopp<\/a> was back in 1997.<\/p> Even if you didn\u2019t see it yourself, if you speak its name at an astronomy society meeting you\u2019ll see many people smile, as fond memories of seeing its twin tails painted on the spring sky come flooding back.<\/p> But anyone predicting A3 will be ‘another Hale-Bopp’ is being very unwise. It\u2019s still far too early to know what it will do, and how bright it will be.<\/p> Initial data seems to suggest that Comet C\/2023 A3 completes an orbit every 80,000 years.<\/p> As of April 2024, A3 is an 11th-magnitude speck in Virgo, visible only through large telescopes and on long-exposure images.<\/p> By the end of September it will be a morning object, perhaps shining as brightly as mag. 0.6, but rising just before the Sun.<\/p> Our best views of A3 will come when it moves up into the evening sky around 10 October.<\/p> By then it will have faded slightly, but is predicted to still be as bright as mag. 0.8, low in the west after sunset.<\/p> Hopefully by then it will have grown a tail, but we can\u2019t count on that.<\/p> By mid-October the comet will still be a first-magnitude object, setting almost three hours after the Sun.<\/p> It should be a lovely sight to the naked eye and in binoculars and telescopes too.<\/p> Comet C\/2023 A3 will reach perihelion – the closest point to the Sun in its orbit – on 28 September 2024.<\/p> At the moment A3 is so faint it is only visible in large telescopes, and that won\u2019t change for months.<\/p> If it behaves itself, early summer 2024 it should<\/i> start to become visible in the evening sky through small telescopes.<\/p> It might<\/i> be bright enough to be visible through binoculars or even to the naked eye in late September 2024, when it will be a pre-dawn object, very<\/i> low in the east before sunrise.<\/p> Will it have a tail by then? We don\u2019t know. It all depends on how old and how active the comet is, and experts are still figuring all that out. <\/p> We\u2019ll lose sight of the comet early October 2024, when it passes close to the Sun as seen from Earth.<\/p> Some are wondering if A3 will be visible in the daytime, by blocking the Sun.<\/p> But they wondered the same thing about Comet ISON a few years ago and that never happened! <\/p> So let\u2019s not even go there now.<\/p> If the comet survives its passage around the Sun, the main northern observing period will begin after 11 or 12 October 2024.<\/p> Then the comet moves up into the evening sky, visible after sunrise, a little higher and easier to see each evening.<\/p> How bright will the comet be during mid-October 2024?<\/p> Some experts are suggesting it might reach first or even zero magnitude, making it obvious to the naked eye (for info on what this means, read our guide to stellar magnitude<\/a>)<\/p> Others are saying we’ll be lucky if it’s even third, which would make it ‘another E3’ not ‘another Hale-Bopp’, only visible to most people through binoculars. We just don\u2019t know. <\/p> If this all sounds very vague, that\u2019s just the way it is. Comets are hard to predict, and have a habit of not living up to expectations.<\/p> The comet is a long, long way away, and not doing much yet.<\/p> But as it gets closer, and more and more people see and photograph it, we\u2019ll have a better idea of what it will do when it approaches and then passes us late in 2024. <\/p> Keep checking back on this page. We\u2019ll keep you updated!<\/p> Find out more about the comet via the International Astronomical Union’s Minor Planet Center<\/a> or at astro.vanbuitenen.nl\/comet\/2023A3<\/a>.<\/strong><\/em><\/p> <\/body><\/html>\n Could Comet A3 become another Great Comet, or even simply reach naked-eye brightness? We’ll find out in autumn 2024… <\/p>\n","protected":false},"author":24,"featured_media":57856,"template":"","categories":[1],"acf":{"readingTimeMinutes":"8"},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/04\/have-you-seen-comet-c-2023-a3-tsuchinshan-atlas-yet-weve-been-keeping-an-eye-on-it.jpg",1500,922,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/04\/have-you-seen-comet-c-2023-a3-tsuchinshan-atlas-yet-weve-been-keeping-an-eye-on-it-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/04\/have-you-seen-comet-c-2023-a3-tsuchinshan-atlas-yet-weve-been-keeping-an-eye-on-it-300x184.jpg",300,184,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/04\/have-you-seen-comet-c-2023-a3-tsuchinshan-atlas-yet-weve-been-keeping-an-eye-on-it-768x472.jpg",768,472,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/04\/have-you-seen-comet-c-2023-a3-tsuchinshan-atlas-yet-weve-been-keeping-an-eye-on-it-1024x629.jpg",800,491,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/04\/have-you-seen-comet-c-2023-a3-tsuchinshan-atlas-yet-weve-been-keeping-an-eye-on-it.jpg",1500,922,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2024\/04\/have-you-seen-comet-c-2023-a3-tsuchinshan-atlas-yet-weve-been-keeping-an-eye-on-it.jpg",1500,922,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Could Comet A3 become another Great Comet, or even simply reach naked-eye brightness? We'll find out in autumn 2024...","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed\/57855"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/rss_feed"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/types\/rss_feed"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/users\/24"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media\/57856"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media?parent=57855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/categories?post=57855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Dominic](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2023\/01\/comet-2022-e3-ztf-aeade3a.jpg\" "\\"\\"\/")
Latest observations<\/strong><\/h2>
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Short-term predictions<\/strong><\/h2>
The story so far<\/strong><\/h2>
![\"\"](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2023\/03\/C-2023-A3-Tsuchinshan-ATLAS-c34ae8a.jpeg\" "\\"\\"\/")
Why everyone’s talking about C\/2023 A3 (Tsuchinshan-ATLAS)<\/strong><\/h2>
![\"Comet](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2024\/03\/comet-pons-brooks-cheltenham-1024x896.jpg?fit=800%2C700\")
![\"Comet](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2020\/02\/Comet-Hale-Bopp-by-Alan-Hale-10d7d34.jpg\" "\\"\\"\/")
![\"Comet](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2020\/02\/Comet-Hale-Bopp-a72fe2b-e1678444047934.png\" "\\"\\"\/")
What we know about C\/2023 A3 (Tsuchinshan-ATLAS)<\/strong><\/h2>
![\"A](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2023\/09\/C-2023-A3-Tsuchinshan-ATLAS-location-1024x545.jpg?fit=800%2C426\")
![\"A](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2024\/04\/Comet-C-2023-A3-Tsuchinshan-ATLAS-April-2024-Virgo-1024x602.jpg?fit=800%2C470\")
Perihelion<\/strong><\/h2>
![\"Comet](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2019\/02\/RGB-Stack-on-comet-v2-2500-4ea82bc-e1678442580373.jpg\" "\\"\\"\/")
![\"Comet](\"https:\/\/c02.purpledshub.com\/uploads\/sites\/48\/2019\/02\/Comet-ISON-27918f1.png\" "\\"\\"\/")
How bright will C\/2023 A3 get?<\/strong><\/h2>
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