2018 RY7

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]

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

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

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

References

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

• List Of Apollo Minor Planets (by designation)
• 2018 RY7 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides  · Observation prediction  · Orbital info  · MOID  · Proper elements  · Observational info  · Close approaches  · Physical info  · Orbit animation
• 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 viewer  · Orbit parameters  · Physical parameters