astro.wikisort.org - Asteroid

2020 PP₁ is a sub-kilometer asteroid, classified as a near-Earth object of the Apollo group, that is a temporary quasi-satellite of the Earth. There are over a dozen known Earth quasi-satellites, some of which switch periodically between the quasi-satellite and horseshoe co-orbital states.[6]

2020 PP₁

Discovery [1][2]
Discovered by	Pan-STARRS 1
Discovery site	Haleakalā Obs.
Discovery date	12 August 2020
Designations
MPC designation	2020 PP1
Alternative designations	P113Iyv [3]
Minor planet category	NEO[4] Apollo Earth crosser
Orbital characteristics [4]
Epoch 1 July 2021 (JD 2459396.5)
Uncertainty parameter 1
Observation arc	3.94 yr (1,438 days)
Earliest precovery date	24 August 2017
Aphelion	1.075 AU
Perihelion	0.9278 AU
Semi-major axis	1.001 AU
Eccentricity	0.07356
Orbital period (sidereal)	3.99 yr
Mean anomaly	87.711°
Mean motion	0° 59m 0.667s / day
Inclination	5.8636°
Longitude of ascending node	140.603°
Time of perihelion	2 April 2021 19:40 UT[4]
Argument of perihelion	43.210°
Earth MOID	0.03257 AU
TJupiter	6.066
Physical characteristics
Mean diameter	0.9–2.0 km (assumed albedo 0.04–0.20)[5]
Apparent magnitude	20.4 (at discovery)[1]
Absolute magnitude (H)	26.7[4] · 26.6[2]

Discovery

2020 PP₁ was discovered on 12 August 2020 by the Pan-STARRS 1 survey at the Haleakalā Observatory.[1] It was later recovered by the Karl Schwarzschild Observatory in August 2021, which allowed for precovery in earlier Pan-STARRS observations from 24 July 2017.[7]

Orbit and orbital evolution

2020 PP₁ is currently an Apollo asteroid (Earth-crossing but with a period longer than a year). Its semi-major axis (currently 1.001715 AU) is similar to that of Earth (0.999789 AU), but it has both low eccentricity (0.07384) and low orbital inclination (5.827°). It alternates between being an Aten asteroid and being an Apollo asteroid, although its orbital evolution is not fully stable and it can be considered as a temporary quasi-satellite of the Earth; its orbital evolution is akin to that of 469219 Kamoʻoalewa.[6]

Physical properties

With an absolute magnitude of 26.6, it has a diameter in the range 10–30 meters (for an assumed albedo range of 0.20–0.04 respectively).[5]

See also

References

Further reading

• Understanding the Distribution of Near-Earth Asteroids Bottke, W. F., Jedicke, R., Morbidelli, A., Petit, J.-M., Gladman, B. 2000, Science, Vol. 288, Issue 5474, pp. 2190–2194.
• A Numerical Survey of Transient Co-orbitals of the Terrestrial Planets Christou, A. A. 2000, Icarus, Vol. 144, Issue 1, pp. 1–20.
• Debiased Orbital and Absolute Magnitude Distribution of the Near-Earth Objects Bottke, W. F., Morbidelli, A., Jedicke, R., Petit, J.-M., Levison, H. F., Michel, P., Metcalfe, T. S. 2002, Icarus, Vol. 156, Issue 2, pp. 399–433.
• Transient co-orbital asteroids Brasser, R., Innanen, K. A., Connors, M., Veillet, C., Wiegert, P., Mikkola, S., Chodas, P. W. 2004, Icarus, Vol. 171, Issue 1, pp. 102–109.
• A trio of horseshoes: past, present and future dynamical evolution of Earth co-orbital asteroids 2015 XX₁₆₉, 2015 YA and 2015 YQ₁ de la Fuente Marcos, C., de la Fuente Marcos, R. 2016, Astrophysics and Space Science, Vol. 361, Issue 4, article 121 (13 pp).

External links

• Discovery MPEC
• 2020 PP₁ data at MPC
• 2020 PP1 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2020 PP1 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2020 PP1 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

---