Comet 220P/McNaught Just Had a Second Outburst: How to Actually See It This Week
A comet that almost nobody outside dedicated observer forums had heard of two months ago is, for the moment, the brightest comet in the sky. 220P/McNaught, a small periodic comet that normally sits around 12th magnitude, too faint for binoculars, has gone through two separate unexplained outbursts in 2026 and is currently sitting at roughly magnitude 6 to 7. That's genuinely bright for a comet, and it's happening now, this week, which is the only reason it's worth writing about at all. Comet outbursts don't wait for anyone, and this one could fade again just as fast as it flared.
If you've never gone looking for a comet before, this is a reasonable one to start with. It won't be dramatic the way a bright naked-eye comet with a long tail is, but it's an accessible, binocular-range target with a genuinely interesting backstory: astronomers still don't know exactly what's causing it to keep flaring up.
What actually happened
220P/McNaught is a Jupiter-family periodic comet, discovered on May 20, 2004 by the Australian-British astronomer Robert H. McNaught at Siding Spring Observatory, one of dozens of comets bearing his name. It orbits the Sun roughly once every 5.5 years and, for most of that orbit, is a dim, unremarkable object that only serious comet-watchers bother tracking.
That changed twice this year. On June 1, 2026, the comet suddenly brightened by about seven magnitudes, a roughly 600-fold jump in output, in a matter of days. It settled back down after that, the way outbursts typically do, but then on August 5 it did it again: a second outburst of similar scale pushed it up to around magnitude 6 to 7, where it currently sits. Two independent outbursts on the same apparition, both of that magnitude, is unusual enough that it's drawn attention from comet observers well beyond the small community that normally tracks an object this faint.
The going explanation, and it is an explanation rather than a confirmed cause, is that a crack, a surface collapse, or a minor fragmentation event exposed a pocket of fresh, volatile-rich ice on the nucleus to direct sunlight, which then flash-vaporized and vented outward as a burst of gas and dust. That's the standard mechanism behind cometary outbursts in general, but nobody has pinned down the specific trigger for either of 220P/McNaught's 2026 events, and there's no way to predict whether a third one is coming.
Where to actually look
The comet is currently positioned in the constellation Cetus, the Sea Monster, close to the star Mu Ceti. It's a pre-dawn target, best placed around 4 a.m. local time, low in the eastern sky rather than overhead. That timing matters more than usual right now because of the Moon: a half-lit Moon is rising at roughly the same time as the comet for Northern Hemisphere observers, and its glare will wash out a faint, diffuse object like this one badly. If you're in the Northern Hemisphere, your best chance is the narrowest possible window right as the comet clears the horizon and before moonlight and twilight both start working against you.
Southern Hemisphere observers have it noticeably easier. There's a roughly 30-minute window of genuinely dark, moonless sky before dawn where the comet sits low in the east, uninterrupted by the Moon. That's a real, if brief, advantage for anyone south of the equator trying to catch this specific event.
Either way, don't expect a bright point of light the way a star at the same magnitude would look. Comet light is spread across a coma rather than concentrated in a point, and this comet's coma is already wider than 7 arcminutes, roughly a quarter the apparent width of the full Moon. What you're actually hunting for is a soft, diffuse smudge with a short tail pointing away from the Sun, not a sharp dot. Binoculars are genuinely useful here since they gather more light than your eyes alone while still giving you a wide enough field of view to sweep the area around Mu Ceti until the smudge resolves.
What you actually need
- A clear view of the eastern horizon before dawn. This isn't an overhead-at-midnight object; you need an unobstructed sightline low to the east.
- Binoculars, ideally 10x50 or similar. A telescope helps resolve more detail, but binoculars are enough to spot the coma at the comet's current brightness, and their wider field of view makes sweeping for a diffuse target much easier than a telescope's narrow view.
- A star chart or sky app centered on Cetus and Mu Ceti. The comet moves against the background stars from night to night, so a fixed finder chart from more than a few days ago may already be slightly off; use something current.
- Genuinely dark skies, away from city light pollution. A diffuse magnitude 6 to 7 object disappears fast under any amount of skyglow, far faster than a star of the same catalog magnitude would.
- Patience, and a willingness to go out more than one night. Comet outbursts fade unpredictably, sometimes within days, so if clouds or the Moon ruin your first attempt, don't assume you have unlimited time to try again.
Why this is worth the early wake-up
Most comet news never turns into anything an ordinary person can actually go outside and see. Comets discovered years before perihelion, comets that stay below binocular range, comets only visible from one hemisphere with a large telescope, all real, all essentially invisible to anyone without specialized equipment and expertise. 220P/McNaught's current outburst is different specifically because it's happening at a brightness genuinely reachable with a pair of binoculars from a normal backyard, provided that backyard is dark enough and you're willing to be up before dawn.
It's also, honestly, a bit of a scientific curiosity in its own right. A comet flaring twice in the same apparition, by hundreds of times its normal brightness each time, isn't the routine behavior astronomers expect from a small, well-studied periodic object like this one. Whatever is happening on 220P/McNaught's nucleus right now is still being figured out in something close to real time, which is a genuinely rare thing to be able to say about an object anyone can point binoculars at this week.
If you miss it
Outburst comets are inherently unpredictable, and there's a real chance 220P/McNaught fades back toward its normal faintness before you get a clear, moonless night to try. That's simply how these events work, and it's not worth losing sleep over in the literal sense beyond one or two early mornings. If the timing doesn't line up, the broader night sky in mid-August 2026 still has plenty on offer: the Perseid meteor shower peaked this same week under an unusually dark new moon, covered in full in the Perseid meteor shower 2026 guide, and the galactic core is still up in the evening sky, detailed in the Milky Way season guide. Either one is a far more forgiving target for a casual night outside than a fast-fading comet outburst.
And if none of that lines up with your schedule either, Gloomia's own real-data astronomy wallpapers, Constellations, Orrery, and Asteroid Watch, are covered in depth in the real-data astronomy wallpapers guide, which walks through exactly what's genuinely live about each one, and what isn't, for anyone who wants a piece of the night sky on their desktop even on a cloudy morning. For a broader look at Gloomia's full space collection, the best space wallpapers guide covers everything from the free Starfield to the more dramatic paid scenes.
The bottom line
220P/McNaught is not going to be the celestial spectacle a bright naked-eye comet with a long, obvious tail delivers. It's a faint, diffuse smudge in binoculars, low in the eastern sky before dawn, and it demands a dark site and some patience to actually track down. But it's also a genuinely rare kind of event: a normally unremarkable comet behaving strangely, twice, in ways astronomers are still working out, and bright enough right now that anyone with binoculars and a clear eastern horizon can go look for themselves rather than just reading about it after the fact. If you're near Cetus before dawn this week and the sky is clear, it's worth the early alarm.
Frequently asked questions
What is Comet 220P/McNaught, and why is everyone talking about it right now?
220P/McNaught is a small, faint periodic comet discovered by Robert H. McNaught in 2004, normally too dim for anything but a serious telescope. It's making headlines because it has gone through two unrelated outbursts in 2026, one on June 1 and a bigger one in early August, each one brightening it by a factor of hundreds within days, for reasons astronomers still can't fully explain.
How bright is the comet right now, in mid-August 2026?
After its August outburst, 220P/McNaught jumped to roughly magnitude 6 to 7, up from around magnitude 12 just weeks earlier. That's easily within binocular range under a dark sky, and borderline naked-eye for experienced observers away from light pollution, though comet light is spread across a fuzzy coma rather than concentrated in a point like a star, so it never looks as obvious as a similarly rated star does.
Where do I look to find it?
The comet is currently in the constellation Cetus, the Sea Monster, near the star Mu Ceti. It's a pre-dawn object, best placed around 4 a.m. local time low in the eastern sky. Southern Hemisphere observers get a cleaner view with roughly a 30-minute moonless window before dawn; Northern Hemisphere observers have to contend with a half-lit Moon rising around the same time as the comet, which washes out its faint glow.
Do I need a telescope to see it?
A telescope helps, but a decent pair of binoculars and a genuinely dark sky are enough to pick it out at its current brightness. What you're looking for isn't a bright point of light, it's a soft, diffuse smudge, since the comet's expanding coma is already wider than 7 arcminutes, about a quarter the width of the full Moon, so its light is spread thin across a wider area than a star's.
Why did the comet suddenly get brighter?
Comet outbursts happen when something on the icy nucleus, a crack, a partial surface collapse, or a small fragmentation, exposes fresh, volatile-rich material to sunlight, which then vents gas and dust outward all at once. 220P/McNaught has now done this twice in 2026: about a 600-fold brightening on June 1, and another jump of similar scale in early August. The exact trigger for either event hasn't been confirmed.
Does Gloomia have a comet wallpaper?
Not specifically, no, and it's worth being upfront about that. But Gloomia's Constellations wallpaper renders the real night sky, live, for whatever coordinates you set, which is a genuinely useful tool for building a mental map of the region around Cetus before you go outside to actually look for the comet with binoculars.