(2019 UN4)
Tracked by NASA JPL Near-Earth Object Web Service (NeoWs), (2019 UN4) is a Q-type (Olivine-Pyroxene) body measuring between 73.21m and 163.7m in diameter. On 2026-10-20, it completes a cislunar approach at 81.80 Lunar Distances (31,456,932.5 km) with a relative heliocentric velocity of 11.28 km/s.
(2019 UN4) (JPL ID 3879533) is a Q-type (Olivine-Pyroxene) Near-Earth Asteroid spanning 73.2m–163.7m (mean 118.5m). On 2026-10-20, it transits Earth's cislunar surveillance sector at 81.798 Lunar Distances (31,456,933 km) with a relative velocity of 11.28 km/s and a theoretical kinetic energy reserve of 37.76 megatons TNT. Its well-constrained heliocentric ephemeris passes safely outside Earth capture corridors while serving as an orbital calibration target.
Exact Landmark Scale Comparison (163.7m)
Kinetic Impact Physics & Orbital Parameters
(2019 UN4) (H = 22.8, Vmag ≈ 20.8) is below consumer optical detection thresholds (requires ≥1000mm survey aperture); explore certified meteorite specimens[↗] or indoor optical projection instead.
Campo del Cielo Meteorite Specimen (Certified Iron-Nickel)
Authentic coarse octahedrite Group IAB iron-nickel meteorite fragment (92.9% Fe, 6.7% Ni) recovered from the Chaco crater field with certificate of authenticity.
Satin-black 5W warm-white LED optical glass lens planetarium projecting 60,000 stars and simulated meteor shower trajectories indoors.
3D Ephemeris Trajectory Waypoints
Planetary Defense Frequently Asked Questions (Schema.org FAQ)
How big is (2019 UN4) compared to city landmarks?
(2019 UN4) has an estimated diameter between 73.21m and 163.7m. At its upper-bound size of 163.7m, it stands 37% as tall as the 443m Empire State Building in New York City and 50% of the 330m Eiffel Tower.
Will (2019 UN4) impact Earth during its 2026-10-20 approach?
No. NASA JPL Center for Near-Earth Object Studies (CNEOS) orbital solutions confirm (2019 UN4) will pass safely at a minimum distance of 81.80 Lunar Distances (31,456,932.5 km). You can still simulate a hypothetical street-level impact in our 3D CesiumJS simulator.
High-transmission BaK-4 Porro prism 15x70 optics with tripod adapter for bright near-Earth flybys, comets, and bolide shower radiants.
Autonomous apochromatic triplet smart telescope with integrated plate-solving, live stacking, and dual-band filter for magnitude 10–16 NEOs.
Ultra-portable Sony IMX678 starlight tele-camera with AI equatorial tracking and automated asteroid field stacking.
Authentic coarse octahedrite Group IAB iron-nickel meteorite fragment (92.9% Fe, 6.7% Ni) recovered from the Chaco crater field.
Low-read-noise Sony STARVIS 2 CMOS planetary and all-sky meteor bolide detection camera with 2.0μm pixels.