astro.wikisort.org - Asteroid

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 by	MLS M. B. Africano [2]
Discovery site	Mount Lemmon Obs.
Discovery date	14 September 2018 (first observed only)
Designations
MPC designation	2018 RY7
Minor planet category	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
Semi-major axis	1.0162 AU
Eccentricity	0.1470
Orbital period (sidereal)	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°
Argument of perihelion	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]

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]

Notes

References

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
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2018 RY7 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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