Asteroid (2026 SG12)
Closest pass on 2026-Sep-30 14:45 TDB (Julian Date: 2461314.114845993)
Key Facts
- On 2026-Sep-30 14:45, asteroid (2026 SG12) passed Earth at a nominal distance of 5,630,000 km (14.7 lunar distances).
- At closest approach, the object was traveling at 11.7 km/s relative to Earth.
- The object has an estimated size of 56.3 m, which is about 5 school buses.
- The miss distance was about 15 times the distance to the Moon.
- Hazard classification: 50 to 140 meters. Reaches Earth surface to carve a crater over a kilometer wide (like Meteor Crater, Arizona), destroying infrastructure across an entire metropolitan region and generating damaging regional seismic waves.
Visual Scale Comparison
| Target | 56 m |
|---|---|
| Smaller | blue whale: 25 m |
| Larger | Boeing 747: 70.6 m |
Object size compared to known reference benchmarks.
Miss Distance Orbital Dial
Concentric orbital rings showing Earth, Moon orbit, and asteroid trajectory.
Astrometric & Orbital Parameters
| Designation | 2026 SG12 |
|---|---|
| Full Object Name | (2026 SG12) |
| Nominal Miss Distance | 5,630,000 km (14.7 lunar distances / 0.0376567732225038 au) |
| 3-Sigma Minimum Distance | 5,550,219.648 km (14.439 LD) |
| Relative Velocity (v_rel) | 11.6599209909943 km/s (about one and a half ISS orbital speeds) |
| Velocity at Infinity (v_inf) | 11.6538510187608 km/s |
| Time Uncertainty (3-sigma) | 01:50 |
| Absolute Magnitude (H) | 24.001 mag |
| Orbit Solution ID | 1 (NASA JPL Small-Body Database) |
| Inside Moon Orbit | No |
| Inside Geostationary Ring | No |
Cite this page
Permanent URL: https://whatnearlyhitus.com/approaches/2026-Sep-30/2026-sg12/ | Machine-readable twin: index.json
APA:
What Nearly Hit Us Project. (2026). Asteroid (2026 SG12) Close Approach on 2026-Sep-30 14:45. What Nearly Hit Us. Retrieved from https://whatnearlyhitus.com/approaches/2026-Sep-30/2026-sg12/MLA:
"Asteroid (2026 SG12) Close Approach on 2026-Sep-30 14:45." What Nearly Hit Us, What Nearly Hit Us Project, 2026-09-24, https://whatnearlyhitus.com/approaches/2026-Sep-30/2026-sg12/.BibTeX:
@misc{approach_2026SG12_202630,
title = {Asteroid (2026 SG12) Close Approach on 2026-Sep-30 14:45},
author = {{What Nearly Hit Us Project}},
year = {2026},
url = {https://whatnearlyhitus.com/approaches/2026-Sep-30/2026-sg12/},
note = {Primary upstream source: NASA/JPL CNEOS CAD API}
}