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2020 MK4 is an active centaur orbiting in the outer Solar System between Jupiter and Saturn.[3] It was discovered on 24 June 2020, by the Pan-STARRS survey at Haleakala Observatory in Hawaii, United States.[4]

2020 MK4
Discovery
Discovered byPan-STARRS
Discovery siteHaleakala Obs.
Discovery date24 June 2020
Designations
MPC designation
2020 MK4
Minor planet category
centaur[1][2]
Orbital characteristics[1]
Epoch 17 December 2020 (JD 2459200.5)
Uncertainty parameter 4
Observation arc147 days (0.402 yr)
Aphelion6.25417 AU (0.935611 Tm)
Perihelion6.0253 AU (901.37 Gm)
Semi-major axis
6.14521 AU (0.919310 Tm)
Eccentricity0.01952
Orbital period (sidereal)
15.23 yr (5564.22 d)
Mean anomaly
138.7°
Mean motion
0° 3m 52.917s / day
Inclination6.72263°
Longitude of ascending node
1.446°
Argument of perihelion
164.5°
Earth MOID5.03147 AU (752.697 Gm)
Jupiter MOID0.578149 AU (86.4899 Gm)
TJupiter3.005
Physical characteristics
Absolute magnitude (H)
11.3[1]

    Size


    A lower limit for the absolute magnitude of the nucleus is Hg=11.30±0.03 mag that, for an albedo in the range 0.1—0.04, gives an upper limit for its size in the interval (23, 37) km.[3]


    Colors


    The values of its color indexes, (g′-r′)=0.42±0.04 and (r′-i′)=0.17±0.04, are similar to the solar ones.[3] Its surface colors place this centaur among the most extreme members of the gray group.[3]


    Outburst


    2020 MK4 was discovered in outburst state[5] and by late 2020, it had returned to its regular brightness.[3]


    Orbital evolution


    Centaurs have short dynamical lives due to strong interactions with the giant planets.[6] 2020 MK4 follows a very chaotic orbital evolution that may lead it to be ejected from the Solar System during the next 200,000 yr.[3] Extensive numerical simulations indicate that 2020 MK4 may have experienced relatively close flybys with comet 29P/Schwassmann–Wachmann, in some cases with one of both objects were transient Jovian satellites; during these events, 2020 MK4 may have crossed the coma of comet 29P when in outburst.[3]


    See also



    References


    1. "JPL Small-Body Database Browser: 2020 MK4" (2020-06-06 last obs.). Jet Propulsion Laboratory. Retrieved 5 April 2021.
    2. "Orbit Fit and Astrometric record for 20MK4". Southwest Research Institute. Retrieved 11 August 2021.The Deep Ecliptic Survey Object Classifications
    3. de la Fuente Marcos, C.; de la Fuente Marcos, R.; Licandro, J.; Serra-Ricart, M.; Martino, S.; de Leon, J.; Chaudry, F.; Alarcón, M. R. (13 May 2021). "The active centaur 2020 MK4". Astronomy & Astrophysics. 649 (1): A85 (15 pages). arXiv:2104.01668. Bibcode:2021A&A...649A..85D. doi:10.1051/0004-6361/202039117. S2CID 233024896.
    4. "MPEC 2020-N36: 2020 MK4". Minor Planet Center. Retrieved 5 April 2021.
    5. "2020 MK4 belatedly confirmed outburst". Minor Planet Mailing List. Retrieved 6 April 2021.
    6. Horner, J.; Evans, N.W.; Bailey, M. E. (2004). "Simulations of the Population of Centaurs I: The Bulk Statistics". Monthly Notices of the Royal Astronomical Society. 354 (3): 798. arXiv:astro-ph/0407400. Bibcode:2004MNRAS.354..798H. doi:10.1111/j.1365-2966.2004.08240.x. S2CID 16002759.




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