2018 RY7
| Discovery[1] | |
|---|---|
| Discovered by | MLS M. B. Africano[2] |
| Discovery site | Mount Lemmon Obs. |
| Discovery date | 14 September 2018 (first observed only) |
| Designations | |
| 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] | |
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]
Orbit and physical properties
[edit]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
[edit]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
[edit]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]
Notes
[edit]References
[edit]- 1 2 3 4 "2018 RY7". Minor Planet Center. Retrieved 13 November 2018.
- 1 2 "MPEC 2018-S12 : 2018 RY7". Minor Planet Electronic Circular. 16 September 2018. Retrieved 7 January 2019.
- 1 2 3 4 5 "JPL Small-Body Database Browser: (2018 RY7)" (2018-10-20 last obs.). Jet Propulsion Laboratory. Retrieved 13 November 2018.
- 1 2 "2018 RY7 – Summary". NEODyS-2, Near Earth Objects – Dynamic Site. Retrieved 13 November 2018.
- 1 2 "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 13 November 2018.
- 1 2 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (11 February 2019). "Dancing with Venus in the shadow of the Earth: a pair of genetically related near-Earth asteroids trapped in a mean-motion resonance". Monthly Notices of the Royal Astronomical Society: Letters. 483 (1): L37–L41. arXiv:1811.04873. Bibcode:2019MNRAS.483L..37D. doi:10.1093/mnrasl/sly214. Retrieved 4 December 2018.
External links
[edit]- List Of Apollo Minor Planets (by designation)
- 2018 RY7 at NeoDyS-2, Near Earth Objects—Dynamic Site
- 2018 RY7 at ESA–space situational awareness
- 2018 RY7 at the JPL Small-Body Database