What Apophis is

(99942) Apophis is a near-Earth asteroid roughly 375 metres across (ESA) — the size of a large stadium complex, or three and a half football pitches laid end to end. It was discovered in 2004, and for a few months it was the most alarming object ever catalogued: early orbit solutions gave it up to a 2.7% chance of striking Earth in 2029, briefly earning the highest rating ever issued on the Torino impact-hazard scale (Level 4).

That alarm is history. Every improvement in the orbit since — culminating in the March 2021 radar campaign by NASA's Goldstone complex and the Green Bank Observatory — has shrunk the uncertainty, and an impact is now ruled out for at least the next 100 years (ESA). What 2029 brings instead is the spectacle of the miss: the asteroid passes under 32,000 km from Earth's surface, closer than the geostationary satellites your TV dish points at.

The name, for the record, comes from the discoverers' fondness for a villain in Stargate SG-1, borrowed from an Egyptian serpent-deity. The "god of chaos" headlines write themselves; the object itself is a quiet lump of rock on a well-measured orbit.

Why scientists care so much

• Earth reshapes it live. Passing this deep in Earth's gravity, Apophis will be measurably torqued — its spin state and possibly its surface will change during the flyby. Planetary scientists get a natural experiment no mission could stage.
• It is the rehearsal for planetary defence. Tracking, predicting and communicating a close pass by a once-Torino-4 object is exactly the drill the field exists for. NASA's OSIRIS-APEX spacecraft is en route to rendezvous with Apophis right after the encounter.
• Statistics say this is your one chance. A pass this close by a body this large happens roughly once in 7,500 years. Nobody reading this gets another.

What it will actually look like

Honesty first: a faint, slowly moving star. No tail, no flare, no streak. At its ~magnitude-3 best it matches the middle stars of the Big Dipper — visible directly from a dark site, marginal from a suburb, invisible from a city centre. What makes it unlike anything else you have seen is the motion: about one Moon-width of sky per minute. Stars do not do that. Satellites do — but you will be watching a mountain, not a machine, and you will know it.

If you arrive expecting cinema, you will be disappointed; if you arrive knowing you are watching a 375-metre body sail past the planet, it is quietly unforgettable. That framing is the honest sell, and it is the only one this site will make.

How to find and follow it

• Go dark, look during the peak window (≈20:00–21:00 UT; local times in the comparison). Give your eyes 20 minutes without white light.
• Use the finder charts that the reference guides (apophis-2029.org, planetarium apps) will publish for the night — the track crosses the sky fast enough that charts beat verbal directions. We will link the definitive charts here nearer the date rather than guess now.
• Binoculars transform it. Any 7×50 or 10×50 pair makes the motion unmistakable and keeps the asteroid comfortably visible even from imperfect skies. Naked eye is the achievement; binoculars are the experience.
• Watch relative to a star pair. The classic trick: find two stars bracketing its position and watch it slide between them — the motion becomes obvious within seconds.
• No filters, no precautions. Unlike an eclipse, nothing here can hurt your eyes — it is night, and the object is faint. Bring warmth, not equipment anxiety.

← The location comparison · Photographing the pass

Sources: ESA Planetary Defence — Apophis (size, distance, 2.7% historical risk figure, 100-year rule-out, radar campaign); NASA (OSIRIS-APEX); Torino Level 4 as reported at discovery, December 2004. Motion rate ≈1 lunar diameter/minute as published in encounter analyses and consistent with the Horizons ephemeris.