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P/2019 LD2 (ATLAS)

For other comets discovered by the Asteroid Terrestrial-impact Last Alert System, see Comet ATLAS.

P/2019 LD2 (ATLAS)
P/2019 LD2 (ATLAS) imaged by the Hubble Space Telescope in April 2020
Discovery[1]
Discovered byA. Fitzsimmons
D. Young
Discovery siteATLAS–MLO
Discovery date10 June 2019
Orbital characteristics[3][4]
Epoch31 March 2024 (JD 2460400.5)
Observation arc5.53 years
Earliest precovery date9 May 2018
Number of
observations		748
Aphelion5.860 AU
Perihelion4.537 AU
Semi-major axis5.199 AU
Eccentricity0.12724
Orbital period11.854 years
Inclination11.606°
179.43°
Argument of
periapsis		118.24°
Mean anomaly124.96°
Last perihelion18 February 2020
Next perihelion25 July 2028[2]
TJupiter2.942
Earth MOID3.580 AU
Jupiter MOID0.052 AU
Physical characteristics[5]
Mean diameter
<2.4 km (1.5 mi)
(V–R) = 0.51±0.09
Comet total
magnitude (M1)		7.0
Comet nuclear
magnitude (M2)		12.2
19.0

P/2019 LD2 (ATLAS) is a Jupiter-family comet and centaur[6] discovered by the Asteroid Terrestrial-impact Last Alert System on 10 June 2019.[7][8] It was initially reported as the first known Jupiter trojan asteroid to display cometary activity,[9] but its classification as a Jupiter trojan was retracted after closer examination and a longer observation arc revealed its orbit to be unstable like a typical Jupiter family comet and implied that its position near the trojans is temporary.[3][10]

  1. ^ Cite error: The named reference MPEC_2020-K134 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Yoshida_2025 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference jpldata was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference MPC was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Kareta_2021 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Kareta_2020 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference NYT-20201203 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Steckloff_2020 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference UH-News was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference UH-News-2 was invoked but never defined (see the help page).

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