astro.wikisort.org - Asteroid

2018 PD₂₀ is a small asteroid, classified as a near-Earth object of the Apollo group, approximately 9–20 meters (30–66 feet) in diameter. On 11 August 2018, it was first observed by ATLAS at the Mauna Loa Observatory on Hawaii (T08),[1] when it passed 33,500 kilometers (20,800 miles) from the Earth.[4] This is notable because it came within a tenth of the lunar distance, or 0.10 LD which is closer to Earth than satellites in a geostationary orbit. These have an altitude of 0.11 LD, about 36,000 km (22,000 mi), approximately 3 times the width of the Earth.

2018 PD₂₀

Orbit and positions of 2018 PD20
Discovery [1]
Discovered by	ATLAS-MLO
Discovery site	Mauna Loa Obs. (first observed only)
Discovery date	11 August 2018
Designations
MPC designation	2018 PD20
Alternative designations	A107ZJi [2][3]
Minor planet category	NEO · Apollo [1][4]
Orbital characteristics [4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 7[4] · 6[1]
Observation arc	1 day
Aphelion	1.6604 AU
Perihelion	0.8163 AU
Semi-major axis	1.2383 AU
Eccentricity	0.3408
Orbital period (sidereal)	1.38 yr (503 d)
Mean anomaly	300.72°
Mean motion	0° 42m 54.72s / day
Inclination	9.4808°
Longitude of ascending node	317.68°
Argument of perihelion	283.56°
Earth MOID	0.000182 AU (0.0708 LD) 27191 km
Physical characteristics
Mean diameter	9 m (est. at 0.24)[5] 20 m (est. at 0.05)[5]
Absolute magnitude (H)	27.38[4] 27.4[1]

Orbit and classification

2018 PD₂₀ orbits the Sun at a distance of 0.82–1.66 AU once every 17 months (503 days; semi-major axis of 1.24 AU). Its orbit has an eccentricity of 0.34 and an inclination of 9° with respect to the ecliptic.[4]

The asteroid has an Earth minimum orbital intersection distance of 0.000181761 AU (27,191 km), which translates into 0.078 lunar distances.[4]

See also

• List of asteroid close approaches to Earth in 2018

References

External links

• Closest asteroid flyby of the year: 2018 PD20 flew past Earth at 0.09 LD
• MPEC 2018-P79 : 2018 PD20
• 2018 PD20 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 PD20 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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