2012 XE₁₃₃ was first observed on 12 December 2012 by J. A. Johnson working for the Catalina Sky Survey. As of March 2013, it has been observed 102 times with a data-arc span of 28 days. It is an Aten asteroid and its semi-major axis of 0.72 AU is very similar to that of Venus but its eccentricity is rather large (0.4332) and its inclination of 6.7° is also significant. With an absolute magnitude of 23.4, it has a diameter of approximately 62 to 138 meters. On 26 November 2020 it has been recovered and has now a well established orbit with an uncertainty parameter of 3.^{[citation needed]}

2012 XE₁₃₃ has been identified as a Venus co-orbital following a transitional path between Venus's Lagrangian points L₅ point and L₃ point.^[4] Besides being a Venus co-orbital, this asteroid is also a Mercury grazer and an Earth crosser. 2012 XE₁₃₃ exhibits resonant (or near-resonant) behavior with Mercury, Venus and the Earth.^[4] Its short-term dynamical evolution is similar to that of two other Venus co-orbitals, 2001 CK32 and Zoozve.^[4]

2012 XE₁₃₃ was included in the Minor Planet Center list of Potentially Hazardous Asteroids (PHAs) because it comes to within 0.05 AU of Earth periodically,^{[citation needed]} but it has since been removed. It will approach Earth at 0.0055 AU (and the Moon at 0.0045 AU) on 30 December 2028.^{[citation needed]}

• (322756) 2001 CK32
• 524522 Zoozve
• 2013 ND15

Further reading

• Understanding the Distribution of Near-Earth Asteroids Bottke, W. F., Jedicke, R., Morbidelli, A., Petit, J.-M., Gladman, B. 2000, Science, Vol. 288, Issue 5474, pp. 2190–2194.
• A Numerical Survey of Transient Co-orbitals of the Terrestrial Planets Christou, A. A. 2000, Icarus, Vol. 144, Issue 1, pp. 1–20.
• Debiased Orbital and Absolute Magnitude Distribution of the Near-Earth Objects Bottke, W. F., Morbidelli, A., Jedicke, R., Petit, J.-M., Levison, H. F., Michel, P., Metcalfe, T. S. 2002, Icarus, Vol. 156, Issue 2, pp. 399–433.
• Transient co-orbital asteroids Brasser, R., Innanen, K. A., Connors, M., Veillet, C., Wiegert, P., Mikkola, S., Chodas, P. W. 2004, Icarus, Vol. 171, Issue 1, pp. 102–109.
• The population of Near Earth Asteroids in coorbital motion with Venus Morais, M. H. M., Morbidelli, A. 2006, Icarus, Vol. 185, Issue 1, pp. 29–38.
• Asteroid 2012 XE133: a transient companion to Venus de la Fuente Marcos, C., de la Fuente Marcos, R. 2013, Monthly Notices of the Royal Astronomical Society, Vol. 432, Issue 2, pp. 886–893.
• AstDys-2 on 2012 XE133 Retrieved 2013-02-20

• 2012 XE₁₃₃ data at MPC
• List of Potentially Hazardous Asteroids (PHAs)
• 2012 XE133 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• 2012 XE133 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• 2012 XE133 at the JPL Small-Body Database  
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters