A rare visitor from deep space is making a safe flyby of Earth today — and backyard skywatchers with telescopes may be able to see it move in real time.
Tonight, a large near-Earth asteroid known as 152637 (1997 NC1) is sweeping past our planet. There is absolutely no danger to Earth, but this is still a sky event worth paying attention to. Why? Because this is a big asteroid, passing unusually close on astronomical terms, and it is bright enough that experienced amateur astronomers may be able to track it from their own backyards.
Think of it as one of the solar system’s ancient leftovers, silently cruising through our neighborhood — a rocky remnant from the time the planets were forming. For one night, we get a front-row seat.
What’s happening?
Asteroid 1997 NC1 makes its closest approach to Earth on Saturday, June 27, passing at a distance of about 2.6 million kilometres. That sounds far — and it is — but in space terms, it is close enough to make this a noteworthy flyby, especially for an object of this size.
This asteroid is classified as a potentially hazardous asteroid, which can sound alarming, but that label does not mean it is dangerous tonight. It simply means the asteroid is large enough and has an orbit that brings it close enough to Earth’s neighborhood that astronomers keep a careful watch on it.
The good news: its path is well known, and this flyby is completely safe.
The exciting part: it should be bright enough to spot in a backyard telescope.
Will I see it with my eyes alone?
No — this is not a naked-eye event.
Unlike a meteor, the asteroid will not flash across the sky. It will not leave a trail. It will not look dramatic at first glance. Through the eyepiece, it will appear as a very faint “star” slowly shifting position against the fixed background stars.
But that’s what makes this so cool.
You are not looking at a star. You are looking at a mountain-sized piece of space rock moving through the inner solar system. If you watch carefully for several minutes, or make a quick sketch of the star field and check again, you may actually notice it has moved.
That’s the thrill of asteroid observing: the sky becomes three-dimensional.
When should you look?
For North American observers, the official closest approach happened during the morning hours, but the best practical time to try observing is after nightfall on June 27, once the sky is fully dark.
Aim for the late evening and around midnight, when the asteroid’s region of sky is well placed in the south. The Moon is bright this weekend, so darker rural skies will help a lot. If you are observing from a city or suburb, this will be more of a challenge — but not impossible with enough aperture and accurate pointing.
Where do you look?
The asteroid is traveling through the constellation Ophiuchus, not far in the sky from the bright red-orange star Antaresin Scorpius.
Here’s the simple skywatching version:
Step outside after dark and face south. Look for Antares, the fiery heart of the Scorpion, glowing low in the southern sky. The asteroid will be moving through the star fields above and around this general region, in Ophiuchus.
This is a rich part of the summer sky, packed with Milky Way star fields, so use a detailed star chart or astronomy app to guide your telescope. Search for “1997 NC1” or “152637” in apps such as SkySafari, Stellarium, or a similar planetarium program. For the most accurate position, use JPL’s Horizons system or updated ephemerides for your location.
Because the asteroid is moving quickly, coordinates matter. A chart that is even a little out of date can put you in the wrong field.
What equipment do you need?
A small telescope may show it under excellent skies, but for most observers I would recommend at least a 6-inch telescope for a more realistic shot. Larger telescopes will make the hunt much easier, especially with the bright Moon nearby.
A computerized GoTo telescope will be a big help. If you are star-hopping manually, use a detailed finder chart and low-power eyepiece to get into the correct field, then increase magnification once you are confident you are in the right area.
Large mounted binoculars may show it under very dark skies, but this is definitely not a casual handheld-binocular target. For most skywatchers, a telescope is the way to go.
How to confirm you’ve found it
The asteroid will look like a faint point of light. The trick is to watch for motion.
Try this:
- Center the correct star field in your telescope.
- Make a quick sketch of the faint stars you see, or take a short exposure with a camera.
- Wait 5 to 10 minutes.
- Look again.
One of the “stars” should have shifted slightly. That moving point is the asteroid.
If you are imaging, take a series of short exposures over several minutes. When you blink the images back and forth, the asteroid should reveal itself by hopping across the star field while the real stars stay put.
This is one of those sky events where patience pays off.
Why this flyby matters
Asteroids like 1997 NC1 are reminders that Earth is part of a busy solar system. Our planet is not sitting alone in empty space. It moves through a cosmic environment filled with dust, meteoroids, comets, and asteroids — most harmless, some scientifically valuable, and a few important enough to monitor carefully.
That’s why astronomers keep tracking these objects. Radar observations during flybys like this can help refine an asteroid’s orbit, measure its size, reveal its shape, and improve our understanding of near-Earth objects.
Tonight’s visitor is not a threat. It is a teaching moment — and a rare observing challenge.
Clouded out?
If clouds ruin your view, don’t worry. Several observatories and online telescope projects are tracking the flyby, so you may still be able to watch it online. But if you have a telescope and clear skies, this is a wonderful chance to try something a little different from the usual planets, Moon, and deep-sky objects.
You won’t see a Hollywood-style space rock streaking overhead.
You’ll see something better: a real asteroid, moving silently through the starry background of our night sky.
So tonight, look south. Find Antares. Aim into the rich summer star fields of Ophiuchus. And remember: that tiny moving speck of light is an ancient piece of the solar system, passing safely by our world.
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