138971 (2001 CB21)
Designation: 138971 | Estimated Size: 696 m
Physical Characteristics
| Primary Designation | 138971 |
|---|---|
| Full Name | 138971 (2001 CB21) |
| Estimated Diameter | 696 m (about 2 Eiffel Towers) |
| Absolute Magnitude (H) | 18.54 |
| Total Encounters in Catalog | 1 |
Keplerian Orbit View
View in Full Solar System Orrery →
Heliocentric Orbit Projection
True-scale heliocentric projection showing 138971 (2001 CB21) (blue ellipse) relative to Earth (cyan), Venus, and Mars orbits.
| Orbital Classification | APO (Near-Earth Object) |
|---|---|
| Semi-Major Axis (a) | 1.030 AU |
| Eccentricity (e) | 0.333 |
| Perihelion Distance (q) | 0.689 AU |
| Aphelion Distance (Q) | 1.380 AU |
| Orbital Period | 1.05 years |
| Orbital Inclination (i) | 7.9° |
| Potentially Hazardous Asteroid | Yes (PHA) |
Earth Close-Approach Timeline
| Date (TDB) | Nominal Distance | Lunar Distances | Velocity | Inside Moon? | Details |
|---|---|---|---|---|---|
| 2026-Sep-29 07:18 | 8,100,000 km | 21.1 LD | 10.228326989398 km/s | No | View Encounter |