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]

2018 RY7
Discovery [1]
Discovered byMLS
M. B. Africano [2]
Discovery siteMount Lemmon Obs.
Discovery date14 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 arc89 days
Aphelion1.1656 AU
Perihelion0.8668 AU
1.0162 AU
Eccentricity0.1470
1.02 yr (374 d)
80.480°
0° 57m 43.92s / day
Inclination13.351°
2.8171°
136.88°
Earth MOID0.0938 AU (36.5424 LD)
Physical characteristics
23–103 m (est.)[4][5][a]
24.4[3]

Orbit and physical properties

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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

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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

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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

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  • ^ This is assuming an albedo of 0.60 and 0.03, respectively.

References

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  1. ^ a b c d "2018 RY7". Minor Planet Center. Retrieved 13 November 2018.
  2. ^ a b "MPEC 2018-S12 : 2018 RY7". Minor Planet Electronic Circular. 16 September 2018. Retrieved 7 January 2019.
  3. ^ a b c d e "JPL Small-Body Database Browser: (2018 RY7)" (2018-10-20 last obs.). Jet Propulsion Laboratory. Retrieved 13 November 2018.
  4. ^ a b "2018 RY7 – Summary". NEODyS-2, Near Earth Objects – Dynamic Site. Retrieved 13 November 2018.
  5. ^ a b "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 13 November 2018.
  6. ^ a b 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.
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