2019 LF6

2019 LF6 is a near-Earth object of the Atira group. After 2021 PH27, it has the second-smallest semi-major axis among the known asteroids (0.555 AU), beating the previously-held record of 2019 AQ3.[3][4] It orbits the Sun in 151 days.[2]

2019 LF6
Highly inclined orbit of 2019 LF6 passing within Mercury's orbit, and slightly outside Venus's orbit
Discovery [1]
Discovered byZwicky Transient Facility
Discovery sitePalomar Obs.
Discovery date10 June 2019
(first observed only)
Designations
2019 LF6
NEO · Atira [1]
Orbital characteristics [2]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 3
Observation arc358 days
Aphelion0.7938 AU
Perihelion0.3170 AU
0.5554 AU
Eccentricity0.42928
0.41 yr (151.2 d)
347.653°
2° 22m 51.74s / day
Inclination29.506°
179.029°
213.779°
Earth MOID0.2608 AU
Physical characteristics
Mean diameter
1–2 km (est. at 0.05–0.15)
17.200±0.398[2]

    Discovery

    Discovered at only 19th magnitude, it is very difficult to see, never getting far from the sun and twilight.[5] It only occasionally brightens above 16th magnitude. Discovery was made using the Zwicky Transient Facility.[6]

    Orbit and classification

    It orbits the Sun at a distance of 0.3–0.8 AU once every 5 months (151 days; semi-major axis of 0.56 AU). Its orbit has an eccentricity of 0.43 and an unusually high[6] inclination of 30° with respect to the ecliptic.[2]

    The asteroids 594913 ꞌAylóꞌchaxnim and 2019 AQ3 are the only known asteroids with closer aphelions. The orbital evolution of 2019 AQ3 is similar to that of 2019 LF6.[7]

    References
    1. "2019 LF6". Minor Planet Center. Retrieved 10 July 2019.
    2. "JPL Small-Body Database Browser: (2019 LF6)" (2019-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 10 July 2019.
    3. "JPL Small-Body Database Search Engine: a > 0 (au) and a < 0.7 (au) and data-arc span > 3 (d)". JPL Solar System Dynamics. Retrieved 10 July 2019.
    4. de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (1 August 2019). "Understanding the evolution of Atira-class asteroid 2019 AQ3, a major step towards the future discovery of the Vatira population". Monthly Notices of the Royal Astronomical Society. 487 (2): 2742–2752. arXiv:1905.08695. Bibcode:2019MNRAS.487.2742D. doi:10.1093/mnras/stz1437.
    5. Hop Aboard 2019 LF6, The Asteroid With The Shortest Year Known Astrobob, 7/10/2019
    6. Young, Monica (10 July 2019). "Sky-surveying Telescopes Sweep Up Near-Earth Asteroids". Sky & Telescope. Retrieved 13 July 2019.
    7. de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (25 July 2019). "Hot and Eccentric: The Discovery of 2019 LF6 as a New Step in the Quest for the Vatira Population". Research Notes of the American Astronomical Society. 3 (7): 106. Bibcode:2019RNAAS...3g.106D. doi:10.3847/2515-5172/ab346c. S2CID 201405666.

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