Key takeaways
- Comet C/2026 A1 (MAPS) was due to pass just 161,000 km from the Sun's surface on 4 April, close enough to be vaporised or emerge as a spectacular naked-eye comet.
- If it had survived, MAPS could have reached magnitude −2 to −5, rivalling Venus or brighter, and become visible in the evening sky from around 7 April, just in time for Easter.
- MAPS was a Kreutz sungrazer, part of a family of comets that all trace back to a single parent body that broke apart over 2,000 years ago.
- It disintegrated about six hours before perihelion, so the hoped-for Easter comet display did not happen.
Jump to section 6 sections
When this post was first published on 1 April 2026, a comet was falling toward the Sun, and by 4 April astronomers would know whether it became one of the most spectacular sights in the night sky this decade, or whether it quietly tore itself apart in the solar furnace. It tore itself apart: Comet MAPS disintegrated about six hours before perihelion.
Comet C/2026 A1 (MAPS) was due to reach perihelion on 4 April 2026 at around 14:22 UTC, passing just 161,000 kilometres from the Sun's surface. To put that in perspective, the Sun is 1.4 million kilometres across, so MAPS would have skimmed barely a tenth of a solar diameter above the photosphere. At that distance, surface temperatures on the comet's sunlit side would have exceeded 2,000°C.
Had the nucleus held together, MAPS could have emerged from the solar glare as a bright naked-eye comet, possibly visible by Easter weekend. Instead, it joined the long list of sungrazers that never came home.
Either way, it was a story worth following.
What Was Comet MAPS?
C/2026 A1 (MAPS) was discovered on 13 January 2026 by a team of four astronomers, Alain Maury, Georges Attard, Daniel Parrott, and Florian Signoret, using the AMACS1 Observatory in Chile's Atacama Desert. The comet's name comes from their initials: Maury, Attard, Parrott, Signoret.
What immediately caught the astronomical community's attention was the distance at which MAPS was found: 2.056 AU (307.6 million km) from the Sun. That is the farthest any Kreutz sungrazer has ever been discovered: a record that exists because most sungrazers are only spotted weeks or days before perihelion by solar observatories like SOHO and STEREO, when they are already deep inside the inner solar system.
Finding one this far out gave astronomers months of lead time. The James Webb Space Telescope turned its Mid-Infrared Instrument (MIRI) on the comet in February 2026, pinning the nucleus diameter down to roughly 400 metres, comparable in size to C/2011 W3 (Lovejoy), the last Kreutz sungrazer to survive a close solar passage.
That comparison matters. Lovejoy made it through. Most sungrazers do not.
The Kreutz Sungrazers: A Family of Fragments
MAPS was not just any comet. It belonged to the Kreutz sungrazer group: a family of comets that all share remarkably similar orbits because they are all fragments of a single parent body.
The story begins over two thousand years ago. Around 371 BC, the Greek philosopher Aristotle recorded a brilliant comet visible in the sky. Modern orbital calculations suggest that this was the original Kreutz progenitor, a large comet that passed dangerously close to the Sun and broke apart. One of the main fragments returned as the Great Comet of 1106, which was recorded across Europe, East Asia, and the Islamic world. That comet fragmented again, spawning a cascade of daughter comets that have been arriving at the Sun ever since.
The family's greatest hits include some of the most spectacular comets in recorded history. C/1843 D1, the Great March Comet, had a tail stretching over 300 million kilometres. C/1965 S1 (Ikeya-Seki) reached an estimated magnitude of −10 at perihelion, bright enough to see in broad daylight next to the Sun. And in December 2011, C/2011 W3 (Lovejoy) stunned astronomers by surviving its perihelion passage intact, emerging from behind the Sun with a magnificent tail visible to the naked eye from the Southern Hemisphere.
NASA's SOHO spacecraft has discovered more than 4,000 Kreutz sungrazers since 1995. The vast majority are tiny: house-sized chunks that silently evaporate as they approach the Sun. Only a handful have been large enough to be observed from the ground. MAPS was one of them.
Would It Survive? The Make-or-Break Moment
This was the question everyone was asking, and before perihelion the honest answer was: nobody knew.
When a comet passes this close to the Sun, it faces two existential threats. The first is thermal stress: the intense heat vaporises surface ice and can fracture the nucleus if internal gas pressure builds faster than it can escape. The second is tidal forces: the Sun's gravity pulls harder on the near side of the comet than the far side, stretching the nucleus apart. At 161,000 km from the solar surface, both forces were extreme.
The comet's recent lightcurve, the graph of how its brightness has changed over time, had astronomers nervous. MAPS brightened steadily through most of March, reaching about magnitude 8.5 by late March. But the brightening was punctuated by flare-ups and pauses, a pattern that is often a warning sign. When a comet's nucleus is fracturing beneath its surface, escaping gas and dust can cause sudden brightness spikes followed by periods of stalling. Several previous sungrazers showed similar behaviour before disintegrating at perihelion.
The comparison with Lovejoy offered cautious hope. Lovejoy had a nucleus of roughly the same size (~400 metres) and survived its 2011 perihelion, though it passed slightly farther from the Sun (about 140,000 km from the surface versus MAPS' 161,000 km). But Lovejoy's nucleus did eventually fragment after perihelion, and the comet dissolved within weeks.
The SOHO and STEREO solar observatories were due to watch MAPS in real time as it rounded the Sun on 4 April. If the comet survived, it was expected to become visible in coronagraph images within hours of perihelion. If it did not, the remnants, a fading dust tail, would drift away from the Sun without a head.
What Would Have Happened If It Survived?
Had MAPS emerged intact from behind the Sun, the next few days could have been extraordinary.
The best-case scenario, modelled on Comet Ikeya-Seki's 1965 performance, would see MAPS reach a peak brightness of around magnitude −5 to −10 near perihelion. At −10, it would be visible in broad daylight as a brilliant point of light near the Sun, though you would need to block the Sun itself (never look directly at it) to spot it.
A more likely scenario, based on Lovejoy's 2011 performance, would see MAPS emerge from the solar glare at around magnitude −2 to +1 by 7 April, fading gradually over the following two weeks. At magnitude −2, it would be brighter than Jupiter and clearly visible to the naked eye in twilight.
The timing was remarkable. MAPS would have become visible in the evening sky from around 7 April, with its angular distance from the Sun increasing rapidly, from about 7° on 5 April to 21° by 10 April. By Easter weekend (5–6 April), keen observers might have caught a first glimpse very low on the western horizon just after sunset, with conditions improving dramatically through the following week.
The comet was due to make its closest approach to Earth on 5–6 April at a distance of 0.96 AU (about 144 million km), quite far as comet encounters go, but the combination of a fresh, actively outgassing nucleus and forward-scattering of sunlight through the dust tail could still have produced a stunning visual.
If MAPS had survived, would you have been ready?
Kit we've tested and reviewed in full
Nobody could promise Comet MAPS would make it round the Sun in one piece. If it had, a bright twilight comet low on the horizon would have been exactly the kind of target these three are built for.
Compact enough to grab quickly if MAPS had popped up low in the west-southwest after sunset, exactly where you would have needed to be fast.
Exactly the size this article recommended for showing tail structure clearly, which would have mattered if MAPS had emerged fainter than the best-case forecasts.
A telescope this size can reveal structure in the dust tail and even a hint of a separate ion tail, had MAPS put on the show everyone was hoping for.
Affiliate links: you pay the same price, we earn a small commission that helps keep WatchTheStars free.
How Comet MAPS Would Have Been Seen From the UK
If MAPS had survived, this is what UK observers were advised to plan for:
When: From approximately 7–8 April onwards, the plan was to look west-southwest in the 30–45 minutes after sunset. The comet's elongation from the Sun would increase each day, making it progressively easier to spot. Mid-April (around 12–17 April) was expected to offer the best combination of brightness and sky separation.
Where in the sky: Low on the western horizon after sunset. You would have needed a clear, unobstructed western horizon: hilltops, coastlines, or open fields away from trees and buildings. The comet would have been at its highest roughly 30–40 minutes after sunset before following the Sun below the horizon.
What to look for: The expected sight was a fuzzy star-like object with a tail pointing upward and to the left (away from the Sun). In binoculars, the tail should have been clearly visible. In a telescope, observers might have seen structure in the dust tail and possibly a secondary ion tail.
Equipment: If MAPS had reached magnitude 0 or brighter, it would have been a naked-eye object: no equipment needed, though binoculars would have dramatically improved the view. A pair of 10×50 binoculars would have shown the tail structure beautifully. If it had been fainter (magnitude 2–4), binoculars would have become essential.
Photography: The recommended setup was a DSLR or mirrorless camera on a tripod with a 50–200mm lens, ISO 800–1600, exposures of 2–8 seconds, to capture the comet and its tail against the twilight sky, shooting in RAW for maximum flexibility in post-processing.
Important caveat: Northern Hemisphere observers were at a disadvantage compared to those in the Southern Hemisphere, as the comet's declination would be relatively low. From southern England (latitude ~51°N), the comet would have been at a modest altitude above the horizon during prime viewing time. The further south you were (Cornwall, Channel Islands), the better the view would have been.
What If It Didn't Make It?
Even if MAPS disintegrated at perihelion, the story was not necessarily over.
When Kreutz sungrazers break apart near the Sun, they can leave behind a "headless" dust tail: a ghostly fan of debris that lingers in the sky for days or even weeks after the nucleus is gone. Comet C/2024 S1 (ATLAS), a Kreutz sungrazer that disintegrated at perihelion in October 2024, left behind exactly this kind of remnant, visible in SOHO coronagraph images for several days.
Whether such a remnant from MAPS would be visible to the naked eye from Earth depended on how much dust was released before and during the breakup. It was unlikely but not impossible.
Either way, the SOHO, STEREO, and Solar Orbiter spacecraft were due to capture the event in exquisite detail. If MAPS broke apart, the footage would be scientifically valuable: each fragmentation event teaches us more about the internal structure and composition of these ancient icy wanderers.
And that is the deeper point. MAPS was a fragment of a fragment of a comet that Aristotle may have seen in 371 BC. Whether it survived that weekend or not, it was carrying a piece of history that stretched back over two millennia, and that alone made it worth watching.
This post was written before the outcome of the perihelion passage was known, and has been updated with it. Follow us on Instagram @watchthestarsuk for real-time updates.
Frequently Asked Questions
Equipment guides
Related topics
Ian ClaytonAmateur astronomer and founder of WatchTheStars.co.uk, dedicated to helping others explore the wonders of our universe. Full profile →
