(2017 KU4)
Tracked by NASA JPL Near-Earth Object Web Service (NeoWs), (2017 KU4) is a S-type (Silicate Stony) body measuring between 46.19m and 103.29m in diameter. On 2026-10-21, it completes a cislunar approach at 149.20 Lunar Distances (57,376,893.3 km) with a relative heliocentric velocity of 18.69 km/s.
(2017 KU4) (JPL ID 3774725) is a S-type (Silicate Stony) Near-Earth Asteroid spanning 46.2m–103.3m (mean 74.7m). On 2026-10-21, it transits Earth's cislunar surveillance sector at 149.197 Lunar Distances (57,376,893 km) with a relative velocity of 18.69 km/s and a theoretical kinetic energy reserve of 25.97 megatons TNT. Its well-constrained heliocentric ephemeris passes safely outside Earth capture corridors while serving as an orbital calibration target.
Exact Landmark Scale Comparison (103.29m)
Kinetic Impact Physics & Orbital Parameters
(2017 KU4) (H = 23.8, Vmag ≈ 23.2) 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 (2017 KU4) compared to city landmarks?
(2017 KU4) has an estimated diameter between 46.19m and 103.29m. At its upper-bound size of 103.29m, it stands 23% as tall as the 443m Empire State Building in New York City and 31% of the 330m Eiffel Tower.
Will (2017 KU4) impact Earth during its 2026-10-21 approach?
No. NASA JPL Center for Near-Earth Object Studies (CNEOS) orbital solutions confirm (2017 KU4) will pass safely at a minimum distance of 149.20 Lunar Distances (57,376,893.3 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.