Apophis
99942 Apophis (2004 MN4)
🚀 Visited by spacecraft⚠️ Potentially hazardous
📋 A written introduction is coming — for now this page shows official values only.
Physical data
- Diameter
- 0.34 km
- Rotation period
- 30.56 hours
- Albedo
- 0.35
- Absolute magnitude H
- 19.09 mag
- Spectral type (SMASS)
- Sq
Orbit
- Orbit class (JPL)
- ATE — Aten
- Semi-major axis
- 0.922 AU
- Eccentricity
- 0.191
- Inclination
- 3.34°
- Perihelion distance
- 0.746 AU
- Aphelion distance
- 1.1 AU
- Orbital period
- 324 days
- Perihelion passage
- JD 2461042.919
- Earth MOID
- 0.000108 AU
Earth approach
- Potentially hazardous (PHA)
- Yes
- Near-Earth object (NEO)
- Yes
In everyday life
- About 340 m across — 0.1% of the 400 km Seoul–Busan expressway.
- One orbit takes about 324 Earth days.
- NASA JPL lists it as a potentially hazardous asteroid — its orbit comes within 16,157 km of Earth's (MOID 0.000108 AU).