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2020 CD3

2020 CD3
2020 CD3 imaged in colour by Gemini North
Discovery [1][2]
Discovered byMt. Lemmon Survey
Discovery siteMt. Lemmon Obs. (CSS)
Discovery date15 February 2020
Designations
2020 CD3
C26FED2 [3][4]
NEO · Arjuna [5] · Apollo [6]
temporarily captured [1] · co-orbital [5]
Orbital characteristics [6]
Epoch 2022-Aug-09 (JD 2459800.5)
Uncertainty parameter 0
Observation arc2.03 yr (742 days)
Earliest precovery date9 May 2018
Aphelion1.0418 AU
Perihelion1.0162 AU
1.029 AU
Eccentricity0.01245
(Geocentric hyperbolic e=58901)[7]
1.04 yr (381.25 d)
151.09°
0° 56m 40.373s / day
Inclination0.63407°
82.211°
49.972°
Earth MOID0.0212 AU (3.17 million km; 8.3 LD)
Physical characteristics
0.9±0.1 m (albedo of 0.35)[8]
1.2±0.1 m (albedo of 0.23)[8]
Mass~4,900 kg (est.)[9]
Mean density
2.1±0.7 g/cm3[8]
1,146.8 s or
19.114 min (double-peaked solution)
573.4 s (single-peaked solution)[8]
0.35 (assumed V-type)[8]
0.23 (assumed from main belt)
V[8]
B–V=0.90±0.07[8]
V–R=0.46±0.08
R–I=0.44±0.06
>30 (current)[10]
20 (at discovery)[2]
31.80±0.34[6]
31.8[2]

2020 CD3 (also CD3 for short)[11][12] is a tiny near-Earth asteroid (or minimoon) that ordinarily orbits the Sun but makes close approaches to the Earth–Moon system, in which it can temporarily enter Earth orbit through temporary satellite capture (TSC). It was discovered at the Mount Lemmon Observatory by astronomers Theodore Pruyne and Kacper Wierzchoś on 15 February 2020, as part of the Mount Lemmon Survey or Catalina Sky Survey. The asteroid's discovery was announced by the Minor Planet Center on 25 February 2020, after subsequent observations confirmed that it was orbiting Earth.

It is the second temporary satellite of Earth discovered in situ, after 2006 RH120, which was discovered in 2006. Based on its nominal trajectory, 2020 CD3 was captured by Earth around 2016–2017, and escaped Earth's gravitational sphere of influence around 7 May 2020.[5][8][13] 2020 CD3 will make another close pass to Earth in March 2044, though it will most likely not be captured by Earth due to the greater approach distance.[14][15]

2020 CD3 has an absolute magnitude around 32, indicating that it is very small in size. Assuming that 2020 CD3 has a low albedo characteristic of dark, carbonaceous C-type asteroids, its diameter is probably around 1.9–3.5 metres (6–11 ft).[16][17] 2020 CD3 is classified as an Arjuna asteroid, a subtype of small Earth-crossing Apollo asteroids that have Earth-like orbits.[5]

  1. ^ a b c Cite error: The named reference MPEC-2020-D104 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference NEO-Exchange was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference PseudoMPEC was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Marcos2020 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference jpldata was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference geocentric was invoked but never defined (see the help page).
  8. ^ a b c d e f g h Cite error: The named reference Bolin2020 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference CNEOS was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference NEODyS was invoked but never defined (see the help page).
  11. ^ Crewe, Ralph (24 November 2020). "Here's what we know about Earth's new minimoon". Universe Today. Retrieved 25 November 2020.
  12. ^ Fedorets, Grigori; et al. (23 November 2020). "Establishing Earth's Minimoon Population through Characterization of Asteroid 2020 CD3". The Astronomical Journal. 160 (6): 277. arXiv:2011.10380. Bibcode:2020AJ....160..277F. doi:10.3847/1538-3881/abc3bc. S2CID 227119071.
  13. ^ Cite error: The named reference Horizons2020-May-07 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference NEODyS-CA was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Koren2020 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Byrd2020 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Crane2020 was invoked but never defined (see the help page).

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