 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 | |
| 2018 PD20 | |
| A107ZJi [2] [3] | |
| 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 |
| 1.2383 AU | |
| Eccentricity | 0.3408 |
| 1.38 yr (503 d) | |
| 300.72 ° | |
| 0° 42m 54.72s / day | |
| Inclination | 9.4808° |
| 317.68° | |
| 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] |
| 27.38
[4] 27.4 [1] | |
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.
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
References
- ^ a b c d e "2018 PD20". Minor Planet Center. Retrieved 7 September 2018.
- ^ "Previous NEO Confirmation Page Objects". Minor Planet Center. Retrieved 7 September 2018.
- ^ "Pseudo-MPEC for A107ZJi". www.projectpluto.com. Archived from the original on 20 August 2018. Retrieved 21 August 2018.
- ^ a b c d e f g "JPL Small-Body Database Browser: (2018 PD20)" (2018-08-12 last obs.). Jet Propulsion Laboratory. Retrieved 7 September 2018.
- ^ a b "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 7 September 2018.
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
- 2018 PD20 at the JPL Small-Body Database
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