2018 RY7
Small near-Earth object of the Apollo group
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2018 RY7, is a small near-Earth object of the Apollo group. It is currently trapped in a 3:5 mean motion resonance with Venus.[6] The object was first observed on 14 September 2018, by astronomer B. M. Africano with the Mount Lemmon Survey at Mount Lemmon Observatory, Arizona, United States.[2][1]
| Discovery[1] | |
|---|---|
| Discovered by | MLS M. B. Africano[2] |
| Discovery site | Mount Lemmon Obs. |
| Discovery date | 14 September 2018 (first observed only) |
| Designations | |
| 2018 RY7 | |
| NEO · Apollo[1][3] Earth crosser | |
| Orbital characteristics[3] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 89 days |
| Aphelion | 1.1656 AU |
| Perihelion | 0.8668 AU |
| 1.0162 AU | |
| Eccentricity | 0.1470 |
| 1.02 yr (374 d) | |
| 80.480° | |
| 0° 57m 43.92s / day | |
| Inclination | 13.351° |
| 2.8171° | |
| 136.88° | |
| Earth MOID | 0.0938 AU (36.5424 LD) |
| Physical characteristics | |
| 23–103 m (est.)[4][5][a] | |
| 24.4[3] | |
Orbit and physical properties
The asteroid's orbit determination is in need of some improvement. It orbits the Sun at a distance of 0.87–1.17 AU once every 374 days (semi-major axis of 1.016 AU). Its orbit has an eccentricity of 0.1470 and an inclination of 13.35° with respect to the ecliptic.[3] It is a member of Apollo dynamical class in both the JPL Small-Body Database and the Minor Planet Center.[1][3] Apollo asteroids are Earth-crossing asteroids.
False binary
2018 RY7 is currently trapped in a 3:5 mean motion resonance with Venus and follows an orbit very similar to that of 2017 SN16.[6] This pair of near-Earth objects show the highest observed level of dynamical coherence among the NEO-population.
Physical characteristics
2018 RY7 has an absolute magnitude of 24.4 which gives a calculated mean diameter between 23 and 103 meters for an assumed geometric albedo of 0.60 and 0.03, respectively.[4][5]