2020 PP1
Discovery [1][2]
Discovered byPan-STARRS 1
Discovery siteHaleakalā Obs.
Discovery date12 August 2020
Designations
2020 PP1
P113Iyv [3]
Orbital characteristics [4]
Epoch 1 July 2021 (JD 2459396.5)
Uncertainty parameter 1
Observation arc3.94 yr (1,438 days)
Earliest precovery date24 August 2017
Aphelion1.075 AU
Perihelion0.9278 AU
1.001 AU
Eccentricity0.07356
3.99 yr
87.711°
0° 59m 0.667s / day
Inclination5.8636°
140.603°
2 April 2021 19:40 UT[4]
43.210°
Earth MOID0.03257 AU
TJupiter6.066
Physical characteristics
Mean diameter
10–30 m (assumed albedo 0.04–0.20)[5]
20.4 (at discovery)[1]
26.7[4] · 26.6[2]

    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]

    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

    1. 1 2 3 "MPEC 2020-P68 : 2020 PP1". Minor Planet Electronic Circular. Minor Planet Center. 13 August 2020. Retrieved 20 January 2021.
    2. 1 2 "2020 PP1". Minor Planet Center. International Astronomical Union. Retrieved 3 August 2021.
    3. ↑ "2020 PP1". NEO Exchange. Las Cumbres Observatory. 13 August 2020. Retrieved 3 August 2021.
    4. 1 2 3 4 "JPL Small-Body Database Browser: 2020 PP1" (2021-08-01 last obs.). Jet Propulsion Laboratory. Retrieved 3 August 2021.
    5. 1 2 Bruton, Dan. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Department of Physics, Engineering, and Astronomy. Stephen F. Austin State University. Archived from the original on 23 July 2011. Retrieved 3 August 2021.
    6. 1 2 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (March 2021). "Using Mars co-orbitals to estimate the importance of rotation-induced YORP break-up events in Earth co-orbital space". Monthly Notices of the Royal Astronomical Society. 501 (4): 6007–6025. arXiv:2101.02563. Bibcode:2021MNRAS.501.6007D. doi:10.1093/mnras/stab062.
    7. ↑ "MPEC 2021-P17 : 2020 PP1". Minor Planet Electronic Circular. Minor Planet Center. 3 August 2021. Retrieved 3 August 2021.

    Further reading

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