(2017 ST20)
Tracked by NASA JPL Near-Earth Object Web Service (NeoWs), (2017 ST20) is a C-type (Carbonaceous Chondrite) body measuring between 79.17m and 177.03m in diameter. On 2026-10-18, it completes a cislunar approach at 91.97 Lunar Distances (35,370,562.3 km) with a relative heliocentric velocity of 8.13 km/s.
(2017 ST20) (JPL ID 3782011) is a C-type (Carbonaceous Chondrite) Near-Earth Asteroid spanning 79.2m–177.0m (mean 128.1m). On 2026-10-18, it transits Earth's cislunar surveillance sector at 91.974 Lunar Distances (35,370,562 km) with a relative velocity of 8.13 km/s and a theoretical kinetic energy reserve of 24.78 megatons TNT. Its well-constrained heliocentric ephemeris passes safely outside Earth capture corridors while serving as an orbital calibration target.
Exact Landmark Scale Comparison (177.03m)
Kinetic Impact Physics & Orbital Parameters
(2017 ST20) (H = 22.6, Vmag ≈ 20.9) 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 ST20) compared to city landmarks?
(2017 ST20) has an estimated diameter between 79.17m and 177.03m. At its upper-bound size of 177.03m, it stands 40% as tall as the 443m Empire State Building in New York City and 54% of the 330m Eiffel Tower.
Will (2017 ST20) impact Earth during its 2026-10-18 approach?
No. NASA JPL Center for Near-Earth Object Studies (CNEOS) orbital solutions confirm (2017 ST20) will pass safely at a minimum distance of 91.97 Lunar Distances (35,370,562.3 km). You can still simulate a hypothetical street-level impact in our 3D CesiumJS simulator.
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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.