2025 MN45
| Discovery | |
|---|---|
| Discovered by | Simonyi Survey Telescope |
| Discovery site | Vera C. Rubin Observatory |
| Discovery date | 2 May 2025 |
| Designations | |
| 2025 MN45 | |
| main belt | |
| Orbital characteristics | |
| Epoch 21 November 2025 (JD 2461000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 5.60 yr (2,047 days) |
| Earliest precovery date | 26 September 2019 |
| Aphelion | 2.491 AU |
| Perihelion | 2.388 AU |
| 2.439 AU | |
| Eccentricity | 0.0210 |
| 3.81 yr (1,392 d) | |
| 95.679° | |
| 0° 15m 31.352s / day | |
| Inclination | 9.852° |
| 54.262° | |
| 98.697° | |
| Physical characteristics | |
| Dimensions | ≃ 0.87 × 0.66 km (minimum) |
| ≃ 0.71 km | |
| ≃ 1.88 min | |
| 0.15 (assumed) | |
| |
| 18.74±0.20 | |
2025 MN45 is a rapidly rotating main-belt asteroid 0.71 kilometers (0.44 mi) in diameter, discovered by the Vera C. Rubin Observatory on 2 May 2025. It has the shortest known rotation period of any asteroid with a diameter larger than 0.5 km (0.31 mi) as of 2026, completing one rotation approximately every 1.88 minutes. The extreme spin rate of 2025 MN45 indicates that it is not a rubble pile, but is instead made of a strong material like solid rock which prevents centrifugal forces from breaking it apart.