Astronomy:2018 RY7
| Discovery [2] | |
|---|---|
| Discovered by | MLS M. B. Africano [1] |
| Discovery site | Mount Lemmon Obs. |
| Discovery date | 14 September 2018 (first observed only) |
| Designations | |
| 2018 RY7 | |
| Minor planet category | NEO · Apollo [2][3] Earth crosser |
| Orbital characteristics [3] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 89 days |
| |{{{apsis}}}|helion}} | 1.1656 AU |
| |{{{apsis}}}|helion}} | 0.8668 AU |
| 1.0162 AU | |
| Eccentricity | 0.1470 |
| Orbital period | 1.02 yr (374 d) |
| Mean anomaly | 80.480° |
| Mean motion | 0° 57m 43.92s / day |
| Inclination | 13.351° |
| Longitude of ascending node | 2.8171° |
| 136.88° | |
| Earth MOID | 0.0938 AU (36.5424 LD) |
| Physical characteristics | |
| Mean diameter | 23–103 m (est.)[4][5][a] |
| Absolute magnitude (H) | 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.[1][2]
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.[2][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]
Notes
References
- ↑ 1.0 1.1 "MPEC 2018-S12 : 2018 RY7". Minor Planet Electronic Circular. 16 September 2018. https://www.minorplanetcenter.net/mpec/K18/K18S12.html. Retrieved 7 January 2019.
- ↑ 2.0 2.1 2.2 2.3 "2018 RY7". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?object_id=2018+RY7. Retrieved 13 November 2018.
- ↑ 3.0 3.1 3.2 3.3 3.4 "JPL Small-Body Database Browser: (2018 RY7)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3829484;cad=1. Retrieved 13 November 2018.
- ↑ 4.0 4.1 "2018 RY7 – Summary". NEODyS-2, Near Earth Objects – Dynamic Site. https://newton.spacedys.com/neodys2/index.php?pc=1.1.0&n=2018+RY7. Retrieved 13 November 2018.
- ↑ 5.0 5.1 "Asteroid Size Estimator". CNEOS NASA/JPL. https://cneos.jpl.nasa.gov/tools/ast_size_est.html. Retrieved 13 November 2018.
- ↑ 6.0 6.1 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. doi:10.1093/mnrasl/sly214. Bibcode: 2019MNRAS.483L..37D. https://academic.oup.com/mnrasl/article-abstract/483/1/L37/5184474. Retrieved 4 December 2018.
External links
- List Of Apollo Minor Planets (by designation)
- 2018 RY7 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- 2018 RY7 at ESA–space situational awareness
- 2018 RY7 at the JPL Small-Body Database
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