(459883) 2014 JX55

(459883) 2014 JX55 is an asteroid from the central regions of the asteroid belt. After its first observations as 2007 EB26 in 2007, it was considered an inner heliospheric asteroid and near-Earth object with one of the closest perihelion ever observed of any body orbiting the Sun,[4] until further observations invalidated the conclusions from early observations. The object measures approximately 2.8 kilometers (1.7 miles) in diameter.

(459883) 2014 JX55
Discovery [1][2]
Discovered byWISE
Discovery siteWISE
Discovery date28 June 2010
Designations
(459883) 2014 JX55
2014 JX55 · 2007 EB26
2010 MV87
main-belt [1][2] · (middle)
Orbital characteristics [2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc11.24 yr (4,106 d)
Aphelion3.0725 AU
Perihelion2.1810 AU
2.6267 AU
Eccentricity0.1697
4.26 yr (1,555 d)
51.957°
0° 13m 53.4s / day
Inclination32.070°
271.86°
32.457°
Physical characteristics
Mean diameter
2.8 km (est. at 0.1)[3]
15.9[1][2]

    Orbit and classification

    Inner heliospheric asteroid

    When the object was first observed as 2007 EB26 by the Mount Lemmon Survey in March 2007, it was considered to have the second-smallest positive semi-major axis (0.55 AU) of any known object orbiting the Sun, after Mercury. It was classified as an Apohele asteroid, which always stay inside of Earth's orbit, approaching within 0.116 AU (17,400,000 km; 10,800,000 mi) of the Sun approximately every 148 days, before leaving for a distance of 0.98 AU, making it a Mercury- and Venus-crossing asteroid.[4] If these early orbital calculations had not turned out to be wrong, the object would still rank today among the inner heliospheric asteroids with the smallest known perihelia.[5]

    Orbital determination as main-belt asteroid

    The object remained listed as an inner heliospheric asteroid for several years,[6] until identifications with 2010 MV87 and 2014 JX55 and a subsequent improvement of the orbital uncertainty completely overturned previous calculations. 2014 JX55 is now a secured central main-belt asteroid orbiting the Sun at a distance of 2.2–3.1 AU once every 4 years and 3 months (1,555 days; semi-major axis of 2.63 AU). Its orbit has an eccentricity of 0.17 and an inclination of 32° with respect to the ecliptic.[2][7]

    References
    1. "459883 (2014 JX55)". Minor Planet Center. Retrieved 15 November 2019.
    2. "JPL Small-Body Database Browser: 459883 (2014 JX55)" (2018-06-06 last obs.). Jet Propulsion Laboratory. Retrieved 15 November 2019.
    3. "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 15 November 2019.
    4. "MPEC 2007-E56 : 2007 EB26". Minor Planet Center. 12 March 2007. Retrieved 15 November 2019. (K07E26B)
    5. List of asteroids with q<0.3075 AU generated by the JPL Small-Body Database Search Engine Retrieved 2013-05-18
    6. Cranmer, Steven R. "Predictions for Dusty Mass Loss from Asteroids during Close Encounters with Solar Probe Plus; Table 1 – Inner heliospheric asteroids tracked in this study, sorted by perihelion". p. 5. arXiv:1606.01785.
    7. "Asteroid (459883) 2014 JX55". AstDyS-2, Asteroids – Dynamic Site. Retrieved 15 November 2019.
    Atira 2007 EB26
    Current

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