Magna · Planetary Defense

Every rock that passes close.Tracked, named, and measured — in one place.

Open the tracker

Near-Earth asteroids — their distance in lunar distances, their size, their speed. The ones NASA is watching, gathered where you can see them.

What passes, unseen

Something crosses our orbit almost every week. Most of us never hear a word.

Dozens of asteroids swing past inside the Moon's distance every year — some the size of a car, a few the size of a building. Astronomers see them coming. The data is public. It's just scattered across observatory feeds and catalog numbers, where no one thinks to look.

This gathers them into one clear view: what's coming, how close, how big, how fast. Not doom — just the quiet fact of a busy sky, made legible.

A ruler you can feel

Distance measured in Moons, not millions of miles.

A "lunar distance" is the gap between here and the Moon — about 239,000 miles. When a rock passes at 2.8 lunar distances, you can picture it: three Moons out, and closing. It turns an abstract number into something your body understands.

Scanning…reading the approach feed…
For every close pass

Four numbers. Nothing hidden.

Designation

Its name in the catalog — the rock, on the record.

Distance

How many Moons away at closest approach.

Size

Estimated diameter — a car, a house, a stadium.

Velocity

How fast it's moving relative to Earth, in km/s.

Date

When it reaches its nearest point to us.

Trajectory

Its path across the sky, drawn toward Earth.

Where the numbers come from
NASA / JPL CNEOS

Every approach is drawn from the Center for Near-Earth Object Studies — the same catalog the world's astronomers use. No guesses, no embellishment.

Nightly scanning

Surveys sweep the sky every clear night and refine each orbit as new observations arrive. The list updates as the sky does.

Measured, not alarmed

Close is not the same as dangerous. We show you the pass exactly as it is — the wonder of a crowded neighborhood, not a warning siren.

The way in

See the sky. Then let it watch for you.

FreeThe live approach list — every upcoming close pass, its distance, size, and speed. Open it right now.
Free accountSave the passes you're tracking and pick up where you left off.
Watch the sky — $14/mo Open the tracker

The tracker lives inside Magna Earth — $14/mo or $129/yr — with the alerts, the scanner, and the rest of the living Earth.