C/2018 C2 (Lemmon)

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C/2018 C2 (Lemmon)
Perihelion
1.9565 AU
−1083±3 AU[a]
Eccentricity1.0018
0.99924 (Barycentric epoch 2200)[4]
≈ 130,000 years (outbound)[4]
-0.00036
0° 0m 0.072s / day
Inclination34.453°
91.14°
134.14°
Earth MOID1.062 AU
Jupiter MOID1.405 AU
Physical characteristics
Dimensions1.7–7.6 km (assumed)
19.0 (March 2018)
15.1±0.63

C/2018 C2 (Lemmon) is a

A/2017 U7.[2] Based on the absolute magnitude of 15.1, it may measure several kilometers in diameter.[5] On 22 March 2018 it was determined to be a hyperbolic comet.[6]

Orbit

Heliocentric eccentricity from 2000–2035 which is strongly influenced by Jupiter's 12 year orbital period.
The path of C/2018 C2 across the sky with annual retrograde loops

While near

Oort Cloud. It had an orbital period of millions of years until the current approach to the Solar System, where perturbations will shorten the orbit drastically to about 5,200 AU, with an orbital period of 130,000 years.[4] Hui Man-To calculated that the comet would have its next perihelion after 130 to 140 thousands years, at a distance of about 2 AU.[8][4]

As of March 2018[update], A/2018 C2 was inbound 2.2 

hyperbolic comet.[9]

Notes

  1. ^ Objects on hyperbolic trajectories have negative semimajor axis, giving them a positive orbital energy.

References

  1. ^ a b "C/2018 C2". Minor Planet Center. Retrieved 5 March 2018.
  2. ^
    IAU Minor Planet Center
    . 4 March 2018. Retrieved 4 March 2018. (AK18C020)
  3. ^ a b c "JPL Small-Body Database Browser: (A/2018 C2)" (2018-02-27 last obs.). Jet Propulsion Laboratory. Archived from the original on 5 March 2018. Retrieved 5 March 2018.
  4. ^ a b c d Horizons output. "Barycentric Osculating Orbital Elements for Comet C/2018 C2 (Lemmon)". Retrieved 15 October 2022.
  5. ^ "Asteroid Size Estimator". Jet Propulsion Laboratory. Retrieved 5 March 2018.
  6. IAU Minor Planet Center
    . 28 March 2018. Retrieved 28 March 2018. (CK18C020)
  7. ^ Horizons output. "Heliocentric orbit of Comet C/2018 C2 (Lemmon) becoming CLOSED in January 2023". Retrieved 16 October 2022.
  8. ^
    S2CID 250760308
    .
  9. ^ "JPL Small-Body Database Search Engine: comets and e > 1". Jet Propulsion Laboratory Solar System Dynamics. Retrieved 4 March 2018.

External links

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