(386454) 2008 XM

(386454) 2008 XMDiscovery[1]

Discovered by| LINEAR
Discovery site| Lincoln Lab's ETS
Discovery date| 2 December 2008
Designations

MPC designation

| (386454) 2008 XM

Alternative designations

| 2008 XM
Minor planet category| Apollo * NEO * PHA[1][2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 5.16 yr (1,884 days)
|{{{apsis}}}|helion}}| 2.3334 AU
|{{{apsis}}}|helion}}| 0.1111 AU

Semi-major axis

| 1.2222 AU
Eccentricity| 0.9091
Orbital period| 1.35 yr (494 days)
Mean anomaly| 204.67°
Mean motion| 0° 43m 45.84s / day
Inclination| 5.4478°
Longitude of ascending node| 240.63°

|{{{apsis}}}|helion}}

| 27.357°
Earth MOID| 0.0048 AU * 1.9 LD
Physical characteristics
Mean diameter| 0.367±0.009 km[3]
Geometric albedo| 0.128±0.032[3]
Absolute magnitude (H)| 20.0[1]

(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]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 3 Naming
* 4 References
* 5 External links

## 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.[citation needed] 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Small-Body Database Browser: 386454 (2008 XM)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2386454. Retrieved 2 June 2017.
2. ↑ 2.0 2.1 2.2 "386454 (2008 XM)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=386454. Retrieved 26 October 2016.
3. ↑ 3.0 3.1 3.2 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. doi:10.1088/0004-637X/784/2/110. Bibcode: 2014ApJ...784..110M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...784..110M. Retrieved 26 October 2016.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* (386454) 2008 XM at NeoDyS-2, Near Earth Objects—Dynamic Site
* Ephemeris * Obs prediction * Orbital info * MOID * Proper elements * Obs info * Close * Physical info * NEOCC
* (386454) 2008 XM at ESA–space situational awareness
* Ephemerides * Observations * Orbit * Physical Properties * Summary
* (386454) 2008 XM at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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