2025 GN1
| Discovery | |
|---|---|
| Discovered by | Cerro Tololo-DECam |
| Discovery site | Cerro Tololo Obs. |
| Discovery date | 4 April 2025 |
| Designations | |
| 2025 GN1 | |
| JKt019 | |
| Atira · NEO | |
| Orbital characteristics | |
| Epoch 21 November 2025 (JD 2461000.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 0.24 yr (88 days) |
| Aphelion | 0.7877 AU |
| Perihelion | 0.1362 AU |
| 0.4620 AU | |
| Eccentricity | 0.7116 |
| 0.314 yr (114.7 days) | |
| 199.148° | |
| 3° 8m 20.338s / day | |
| Inclination | 32.835° |
| 41.017° | |
| 6.106° | |
| Earth MOID | 0.225 AU |
| Mercury MOID | 0.124 AU |
| Venus MOID | 0.027 AU |
| Physical characteristics | |
| 0.4±0.2 km | |
| 0.098±0.081 (assumed for X-type asteroids) | |
| X | |
| 20.06±0.25 | |
2025 GN1 is an Atira-type near-Earth asteroid discovered by the Dark Energy Camera (DECam) at Cerro Tololo Inter-American Observatory on 4 April 2025. With a diameter of 0.4 km (0.25 mi), it is believed to be a fragment of the near-Earth asteroid 2021 PH27, the closest orbiting asteroid to the Sun known as of 2026. 2025 GN1 and 2021 PH27 form an asteroid pair because they share identical orbits and spectral types, which suggest that they split apart from a single parent body over 10,500 years ago. The splitting of the parent body was likely caused by either thermal fracturing or rotational fissioning due to either outgassing or the YORP effect.