(386454) 2008 XM

(386454) 2008 XM is a highly eccentric, sub-kilometer-sized asteroid, with one of the smallest known perihelions among all minor planets. It is classified as near-Earth object of the Apollo group and was discovered on 2 December 2008, by the LINEAR program at Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States.[2]

(386454) 2008 XM
Discovery [1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date2 December 2008
Designations
(386454) 2008 XM
2008 XM
Apollo · NEO · PHA [1][2]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc5.16 yr (1,884 days)
Aphelion2.3334 AU
Perihelion0.1111 AU
1.2222 AU
Eccentricity0.9091
1.35 yr (494 days)
204.67°
0° 43m 45.84s / day
Inclination5.4478°
240.63°
27.357°
Earth MOID0.0048 AU · 1.9 LD
Physical characteristics
Mean diameter
0.367±0.009 km[3]
0.128±0.032[3]
20.0[1]

    Orbit and classification

    The asteroid orbits the Sun at a distance of 0.1–2.3 AU once every 16 months (494 days). Its orbit has an eccentricity of 0.91 and an inclination of 5° with respect to the ecliptic.[1] Due to its outstanding eccentricity, it is also a Mercury-crosser, Venus-crosser and Mars-crosser.

    It has the third-smallest perihelion of any numbered asteroid behind (137924) 2000 BD19 and (374158) 2004 UL. Its Earth minimum orbital intersection distance of 0.0047 AU (700,000 km) corresponds to only 1.9 lunar distances.[1]

    Physical characteristics

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 367±9 meters in diameter and its surface has an albedo of 0.128.[3] As of 2016, the body's composition and spectral type, as well as its rotation period and shape remains unknown.[1]

    Naming

    As of 2020, this minor planet remains unnamed.[2]

    References
    1. "JPL Small-Body Database Browser: 386454 (2008 XM)" (2014-01-29 last obs.). Jet Propulsion Laboratory. Retrieved 2 June 2017.
    2. "386454 (2008 XM)". Minor Planet Center. Retrieved 26 October 2016.
    3. Mainzer, A.; Bauer, J.; Grav, T.; Masiero, J.; Cutri, R. M.; Wright, E.; et al. (April 2014). "The Population of Tiny Near-Earth Objects Observed by NEOWISE". The Astrophysical Journal. 784 (2): 7. arXiv:1310.2980. Bibcode:2014ApJ...784..110M. doi:10.1088/0004-637X/784/2/110. Retrieved 26 October 2016.
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