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Loading contentA near-Earth asteroid studied for its close approaches to Earth.
asteroid:apophisDataset membership
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In the graph export: graph.json · graph.jsonld
Planned API: GET /api/v0/entities/asteroid:apophis
Scientific entity. See the evidence framework and authority dashboard.
How 99942 Apophis connects across Asteria Star — scientific, cultural, and astrological links are kept separate.
The Sun and the bodies gravitationally bound to it.
Near-Earth asteroids with orbits mostly inside Earth's but reaching out to cross it, named after 2062 Aten.
Automatic systems at CNEOS and ESA continuously propagate every known orbit forward for a century or more, flagging any that could approach Earth. Apophis was tracked this way until observations ruled out an impact for the next century.
Explaining a risk to decision-makers and the public accurately and without alarm — including retracting a warning when better data clears an object, as happened with Apophis. Clear communication is itself part of planetary defence.
A 0–10 scale, like a hazard traffic light, for communicating the risk of a near-Earth object to the public — combining impact probability and energy into a single colour-coded number. Apophis briefly reached level 4, the highest ever, before further observations returned it to zero.
A large, dark asteroid in the outer main belt.
A near-Earth asteroid sampled by NASA's OSIRIS-REx.
The first Mars-crossing asteroid discovered — its orbit crosses that of Mars.
The largest stony (S-type) asteroid and the parent of the Eunomia family in the intermediate main belt.
The namesake of the Hilda group, whose members orbit in a 3:2 mean-motion resonance with Jupiter in the outer main belt.
A metal-rich main-belt asteroid and NASA mission target.
Facts on this topic will be cited from these primary and reference sources.
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.