How to See a Comet With Your Eyes or Binoculars

Know what to expect

Astronomers measure brightness with a scale called magnitude, where lower numbers are brighter. NASA gives a rough scale: the brightest stars are around magnitude 1, and the faintest are around magnitude 6. A comet near magnitude 3, like NEOWISE in mid-July 2020, is visible to the naked eye. A comet near magnitude 5 sits at the edge. NASA said Comet 12P/Pons-Brooks in 2024 would peak near magnitude 5 unless it had an outburst, and recommended binoculars or a small telescope.

Do not expect a photo. NASA's Bill Cooke has cautioned that pictures of a comet with a long green tail can mislead, and that you should not expect to see that with your own eyes. A faint comet looks like a small, fuzzy glow, and a bright one adds a tail.

Find out when a comet is worth the trip

Forecasts change, so check them close to the date. NASA's skywatching hub offers a monthly What's Up guide and links to the Night Sky Network, a group of amateur astronomy clubs. A club near you may hold a viewing night.

Brightness predictions are uncertain. Cooke has said that comet outbursts are impossible to predict. Comet 12P had minor outbursts roughly monthly in early 2024. An outburst is a sudden jump in brightness. If a comet is forecast to be a spectacle, treat the forecast as a hope, not a promise. The history of great comets shows how rare the truly bright ones are.

A comet's position also changes every night. NASA noted that NEOWISE rose higher above the northwestern horizon each evening. To check where a specific comet is on your date, see the guide to the JPL Small-Body Database, which explains NASA's lookup tools.

Choosing and using binoculars

NASA's Night Sky Network explains the numbers on binoculars. In 7x35, the first number is magnification and the second is the lens width in millimeters. It suggests 7x35 to 10x50 for beginners, and warns against anything much more powerful than 10x50 at first. Higher power gives a narrower view and shakier images. Large binoculars can jiggle unless they are mounted on a tripod or have image stabilization.

Wide fields matter for comets. NASA says binoculars show a much larger part of the sky than most telescopes, and NEOWISE's long tail was the reason it advised them. Roof-prism binoculars are lighter, and porro-prism models are heavier but offer wider views. Either works. Steady your hands by leaning against a wall, fence or car.

Where, when and what to look for

Move away from city lights and find an open view of the horizon. For NEOWISE, NASA suggested beaches, fields and higher ground, and said that binoculars may be necessary where light pollution is worse. Many bright comets sit low in the sky, so a clear horizon can decide whether you see one.

Timing depends on the comet. NASA's guidance for Comet 10P/Tempel 2 in July 2026 was to start once the sky is fully dark, about 45 to 60 minutes after sunset, and to choose a night around the New Moon. For 12P in 2024, the comet was low in the west just after sunset and hard to see an hour later. NEOWISE could be seen in the northeast before sunrise at first, then in the northwest after sunset.

Use a chart or app that shows the comet for your date and place. NASA's guides name landmarks. NEOWISE sat below the bowl of the Big Dipper, and 10P was in the constellation Capricornus. A named constellation or bright star gives you a starting point. Then sweep slowly with binoculars.

Once you find it, expect something modest. NASA's description of 10P was a small, fuzzy glow, possibly with a brighter central knot and a short, broad, fan-shaped tail. It added that the comet was not dramatic and not something you see just by looking up. A comet looks soft and blurry, while a star is a sharp point. NASA said NEOWISE, without optics, looked like a fuzzy star with a bit of a tail. The anatomy of a comet explains what those parts are, and the guide to comet tails shows why the tail points away from the Sun.

Sun safety

Never point binoculars or a telescope at the Sun without a proper solar filter made for that purpose. NASA's rule is plain: do not look at the Sun through a camera lens, telescope, binoculars or any other optical device unless a proper solar filter is attached to the front. Eclipse glasses are not a substitute, and NASA says not to use them with binoculars, telescopes or cameras. Binoculars and telescopes can look at the Sun only with filters made for them, and NASA advises asking an astronomer first.

This matters for comet hunting because comets near the Sun appear low in twilight. Wait until the Sun is completely below the horizon before you raise optics toward the western sky after sunset. Before sunrise, stop sweeping the eastern horizon as the sky brightens.

Common mistakes and myths

"You need a telescope." For a bright comet, binoculars often work better because of the wider field of view, as NASA noted for NEOWISE.

"Photos show what you will see." They do not. Cooke cautioned that pictures can mislead.

"Every comet in the news is visible." Most are not. NASA says comets start faint and distant and need a telescope at first.

"The Moon does not matter." Moonlight washes out a faint comet. NASA pointed to the New Moon as the best window for 10P.

"The comet stays in one spot." It moves against the stars from night to night, so check a chart for your date.

Frequently asked questions

Are binoculars or a telescope needed?

For a faint comet, yes. For a bright one, binoculars are usually the better tool, as NASA recommended for NEOWISE.

What is the best time to look?

It depends on the comet. NASA suggested waiting 45 to 60 minutes after sunset for 10P, and looking soon after sunset for comets low in the west.

How can a comet be told apart from a star?

A comet looks fuzzy and may have a tail, while a star is a sharp point. Over several nights, a comet also changes position against the background stars.

Is it safe to look near the Sun at dusk?

Only once the Sun has fully set. Never point binoculars or a telescope at the Sun without a proper solar filter made for that purpose.