Newly Found Sungrazing Comet Could Flare Brighter Than Venus—or Disintegrate at the Sun

As April begins, a small, dark chunk of ice and dust is rushing toward the sun at more than 340,000 mph, on a path that will take it skimming just above the star’s visible surface.

If it survives, Comet C/2026 A1 (MAPS) could briefly outshine every planet and unfurl a ghostly tail in the evening sky. If it does not, it will disintegrate in a blast of heat and tidal forces, its demise recorded only by solar observatories.

For now, astronomers say, both outcomes are still on the table.

C/2026 A1 is a long-period “sungrazing” comet on track to reach perihelion—its closest point to the sun—on April 4 at about 14:23 Coordinated Universal Time. At that moment it will pass roughly 0.0057 astronomical unit from the sun’s center, only about 162,000 kilometers (101,000 miles) above the solar photosphere.

“This is firmly in sungrazer territory,” said veteran comet researcher Zdeněk Sekanina in a recent technical paper assessing the object. “The physical conditions near perihelion are so extreme that survival is by no means guaranteed.”

A record-setting discovery from a small Chilean observatory

The comet was first spotted on Jan. 13 from the AMACS1 Observatory near San Pedro de Atacama, Chile, by the MAP Observation Program (MAPS), a small team led by French astronomer Alain Maury with Georges Attard, Daniel Parrott and Florian Signoret.

Using a 0.28-meter Schmidt telescope and a sensitive CCD camera, the group picked up a faint, fuzzy object of about magnitude 17.8 in the southern constellation Columba. At the time, the comet was more than 300 million kilometers from the sun, or 2.06 astronomical units.

Within a week, additional observations allowed the Minor Planet Center in Cambridge, Massachusetts, to compute a preliminary orbit. On Jan. 20, the International Astronomical Union’s Central Bureau for Astronomical Telegrams issued a circular confirming the discovery and assigning the designation C/2026 A1 (MAPS).

Follow-up work quickly showed that MAPS was no ordinary comet. Its orbit placed it in the Kreutz family, a swarm of sungrazing comets believed to be fragments of a single giant object that broke apart many centuries ago. Thousands of Kreutz comets have been seen diving into the sun in images from NASA and ESA’s Solar and Heliospheric Observatory (SOHO).

What made this one stand out is how early it was found. Most Kreutz sungrazers are discovered by SOHO days or even hours before they are destroyed. Only a handful have ever been seen from the ground before perihelion, and none at such a large distance from the sun.

“This is the most distant ground-based discovery of a Kreutz comet to date,” Sekanina wrote, calling it a rare chance to monitor a sungrazer’s evolution over months instead of days.

A tiny nucleus on a huge, looping path

Refined orbital solutions show MAPS moving on a highly elongated, retrograde path tilted about 145 degrees to the plane of the planets. Its semimajor axis is around 154 astronomical units, giving it an orbital period of roughly 1,900 years.

At aphelion, the far point of its orbit, the comet travels hundreds of times farther from the sun than Earth does, out beyond the Kuiper Belt into the distant reaches of the solar system. Its last passage near the sun likely occurred in late antiquity.

In February, the James Webb Space Telescope turned its infrared eye on the inbound comet. Analysis of those data suggests the solid nucleus is only about 400 meters (1,300 feet) across—comparable to the well-known sungrazer Comet Lovejoy (C/2011 W3).

That size estimate has fueled caution about MAPS’ survival prospects.

“The faint absolute magnitude of C/2026 A1 (MAPS) does not bode well for the comet’s survival past perihelion,” Daniel Green of the Central Bureau for Astronomical Telegrams wrote in the original discovery notice, a line that has since been widely quoted in astronomy reports.

How bright could it get?

Since December, the comet has brightened from roughly magnitude 20 in early “precovery” images to about magnitude 8 by late March, becoming accessible in small telescopes and binoculars for experienced observers with clear southwestern horizons.

From that behavior, astronomers derive a light curve—a mathematical relationship between brightness and distance from the sun. Extrapolating that curve inward is tricky, especially for sungrazers, whose activity can change abruptly as ices deep inside the nucleus start to vaporize.

In optimistic scenarios, MAPS’ dust and gas production ramps up steeply in the days before perihelion and the nucleus holds together. Under those conditions, several independent forecasts suggest the comet could briefly reach magnitude –8 to –9 when closest to the sun, brighter than Venus and potentially detectable in broad daylight if the sun is safely blocked.

More conservative models, including Sekanina’s, point the other way. His analysis of the light curve so far concludes that to match the brightness of past “great comets” in the same family, such as Ikeya–Seki in 1965, MAPS would have to brighten at an unrealistically fast rate as it nears the sun.

“Given the comet’s modest intrinsic brightness and small nucleus, I consider it unlikely to achieve the extraordinary luminosity of the brightest Kreutz comets,” Sekanina wrote.

Many Kreutz comets disintegrate outright near perihelion, leaving only a fading dust tail. Others, like Lovejoy in 2011, survive their closest approach only to break apart days later as internal stresses catch up.

A late breakup might paradoxically produce the most dramatic visual display, by dumping fresh dust into space to be stretched into a long, bright tail.

What observers can expect—and how to stay safe

For casual skywatchers in the Northern Hemisphere, MAPS has so far been a challenging target, low in the evening twilight.

In the days before April 4, it will slide closer to the sun in the sky, making it harder to see from the ground even as its actual brightness increases. At perihelion, its apparent separation from the solar disk will shrink to about 0.04 degree—less than one-tenth the apparent diameter of the sun.

That geometry means any talk of a “daylight comet” on April 4 needs to be accompanied by firm warnings, astronomers say.

“Observing a comet when it is very close to the sun can be dangerous,” one guide from a public astronomy site cautioned, urging people not to look at or near the sun with unfiltered optics.

Specialized instruments such as coronagraphs on SOHO, NASA’s STEREO spacecraft and ESA’s Solar Orbiter will provide the clearest views around perihelion by blocking the sun’s glare. The public will likely see the comet’s drama play out through images those missions post online, not with the naked eye.

If MAPS emerges intact on the far side of the sun, viewing prospects improve somewhat. Models show the comet moving into the western evening sky in early to mid-April, low in the twilight, with the best chances from the Southern Hemisphere and low northern latitudes. Venus will be nearby as a bright guide star.

Even in that relatively optimistic case, observers will need a clear horizon and may contend with bright sky conditions. And if the comet disintegrates completely near perihelion, there may be little to see at all.

A fragment from deep time

Beyond the question of sky spectacle, C/2026 A1 offers scientists a window into the history of the solar system.

Kreutz comets are thought to be shards of a single super-comet that broke up in a complex chain of events. Historical records describe exceptionally bright “daylight comets” in 371 B.C. and A.D. 363, which some researchers link to earlier passages of the parent body or its largest fragments.

Sekanina’s recent work suggests MAPS is probably a second-generation fragment from that ancient system, split off from one of the A.D. 363 comets and now completing another 1,900-year circuit.

This time, instead of being recorded by chroniclers on parchment, its fate will be followed by space telescopes, solar probes and backyard observers comparing images on social media.

Another comet, C/2025 R3 (PanSTARRS), is expected to brighten later in April and could become a more straightforward naked-eye object. Together, the two have fueled talk of a “double comet season,” even as astronomers caution that comet forecasts are notoriously uncertain.

In the coming days, those forecasts will be tested. As MAPS disappears into the sun’s glare, telescopes on and above Earth will watch to see whether a small nucleus can withstand one of the harshest environments in the solar system.

By mid-April, scientists will know whether C/2026 A1 has joined the short list of memorable sungrazers or has simply become another faint wisp in the long breakup of a comet that has haunted Earth’s skies since long before modern science existed.