2020 VT4

2020 VT4
Discovery [1][2]
Discovered byATLAS-MLO
Discovery siteMauna Loa Obs.
Discovery date14 November 2020
Designations
2020 VT4
A10sHcN [3][4]
NEO · Apollo (pre-flyby)[5]
Aten (post-flyby)[2]
Orbital characteristics [2]
Epoch 17 December 2020 (JD 2459200.5)
(post-flyby as pre-flyby was very different)
Uncertainty parameter 5
Observation arc5 days
Aphelion1.092 AU
Perihelion0.724 AU
0.908 AU
Eccentricity0.20299
0.86 yr (315.92 d)
143.860°
1° 8m 22.286s / day
Inclination10.173°
231.422°
14 November 2020 12:17 UT (pre-flyby)[5]
53.678°
Earth MOID0.0002 AU
Physical characteristics
5–11 m (assumed)[6]
20.0 (current)[7]
17.3 (at discovery)[1]
28.66±0.50[5]
28.7[2]

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.[a] The asteroid was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey at the Mauna Loa Observatory fifteen hours after its closest approach to Earth.[b] The Earth encounter perturbed the asteroid's trajectory from an Earth-crossing Apollo-type orbit to an Aten-type orbit, subsequently reducing the asteroid's heliocentric orbital period from 1.5 years to 0.86 years.[5][2]

2020 VT4 passed closer to Earth than any known asteroid, except for those that became meteors. It passed closer than 2020 QG and 2011 CQ1, which passed about 3,000 km and 5,500 km from Earth's surface, respectively.[6] Given an estimated absolute magnitude of 28.7, 2020 VT4 is estimated to be around 5 to 10 metres in diameter. Had it impacted Earth, it would mostly have disintegrated during atmospheric entry and might have left a common strewn field.[4]

  1. ^ a b Cite error: The named reference MPEC-2020-V152 was invoked but never defined (see the help page).
  2. ^ a b c d e 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. ^ a b 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 jpldata was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference CNEOS was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference NEODyS was invoked but never defined (see the help page).


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