2020 PP1

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 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]

    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. "MPEC 2020-P68 : 2020 PP1". Minor Planet Electronic Circular. Minor Planet Center. 13 August 2020. Retrieved 20 January 2021.
    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. "JPL Small-Body Database Browser: 2020 PP1" (2021-08-01 last obs.). Jet Propulsion Laboratory. Retrieved 3 August 2021.
    5. 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. 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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