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]
Synodic rotation period
1,146.8 s or 19.114 min (double-peaked solution) 573.4 s (single-peaked solution)[8]
Geometric albedo
0.35 (assumed V-type)[8] 0.23 (assumed from main belt)
Spectral type
V[8] B–V=0.90±0.07[8] V–R=0.46±0.08 R–I=0.44±0.06
Apparent magnitude
>30 (current)[10] 20 (at discovery)[2]
Absolute magnitude (H)
31.80±0.34[6] 31.8[2]
2020 CD3 (also 2020CD3 or 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]
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^Crewe, Ralph (24 November 2020). "Here's what we know about Earth's new minimoon". Universe Today. Retrieved 25 November 2020.
^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.
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2020CD3 (also 2020CD3 or CD3 for short) is a tiny near-Earth asteroid (or minimoon) that ordinarily orbits the Sun but makes close approaches to the...
Look up cd3 in Wiktionary, the free dictionary. CD3 or CD-3 may refer to: CD3, or 2020CD3, a small minimoon of Earth CD3 (immunology), an antigen, cluster...
satellites. As of 2020[update], the only confirmed examples have been 2006 RH120 in Earth orbit during 2006 and 2007,[citation needed] and 2020CD3 in Earth orbit...
MPEC 2020-Q51 : 2020 QG, Minor Planet Center, https://www.minorplanetcenter.net/mpec/K20/K20Q51.html, 17 August 2020, accessed 17 August 2020. Newly-discovered...
common phenomenon. The only observed examples are 1991 VG, 2006 RH120, 2020CD3. 2006 RH120 was a temporary satellite of Earth for nine months in 2006...
Earth for twelve months from July 2006 to July 2007, and 2020CD3, which was discovered in 2020. Some defunct space probes or rockets have also been observed...
(WISE) satellite in January 2010. (614689) 2020 XL5: Discovered by the Pan-STARRS survey in December 2020 and later recognised as an Earth trojan in January 2021...
Cruithne and 469219 Kamoʻoalewa, and the occasional temporary satellite, like 2020CD3; however, since they do not permanently orbit Earth, they are not considered...
A number of significant scientific events occurred in 2020. 1 October Researchers report the discovery of a novel overlapping gene (OLG) (a gene partially...
(980-foot) asteroid 2010 TK7 is in a tadpole orbit around the leading L4 point. 2020 VT1 follows a temporary horseshoe orbit with respect to Mars. Astronomy portal...
also that it is not lunar ejecta; it is also different from the V type of 2020CD3 and the K-type of 2022 NX1. It is a S type asteroid and considering typical...
C/2020 F3 (NEOWISE) or Comet NEOWISE is a long period comet with a near-parabolic orbit discovered on March 27, 2020, by astronomers during the NEOWISE...
Earth satellite discovered in situ 2006 2020CD3 – another temporary Earth satellite discovered in 20202020 SO – a suspected near-Earth object identified...
2020 SO is a near-Earth object identified to be the Centaur upper stage used on 20 September 1966 to launch the Surveyor 2 spacecraft. The object was discovered...
reducing the effectiveness of muromonab-CD3. Muromonab-CD3 can cause excessive immunosuppression. Although CD3 antibodies act more specifically than polyclonal...
observed to be temporary satellites of Earth: 2020CD3 in February 2020 and 2020 SO in September 2020, albeit the latter has been confirmed to be a rocket...
approaches to Earth in 2020 "2020 JJ". Minor Planet Center. Retrieved 5 May 2020. "JPL Small-Body Database Browser: (2020 JJ)" (2020-05-04 last obs.). Jet...
qualified SDE result of the caucuses held only in CD3 on February 3, but the exact name of the CD3 elected national convention delegate will only be selected...
2020 VT4 is a tiny near-Earth asteroid that passed 370 km (230 mi) above Earth's surface on 13 November 2020 at 17:20 UTC. The asteroid was discovered...
asteroid temporarily captured by Earth in 2022 2020CD3 – another temporary Earth satellite discovered in 2020 2006 RH120 – the first temporary Earth satellite...