(433953) 1997 XR2

Template:Mp is a sub-kilometer sized asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. It was discovered on 4 December 1997, by the Lincoln Near-Earth Asteroid Research (LINEAR) program at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States.<ref name="MPC" />

Orbit and classification

The asteroid orbits the Sun at a distance of 0.9–1.3 AU once every 13 months (408 days). Its orbit has an eccentricity of 0.20 and an inclination of 7° with respect to the ecliptic.

It has an Earth minimum orbital intersection distance of 0.000135 AU, which corresponds to 0.05 lunar distances.<ref name="jpldata" /> The body's observation arc begins with its official discovery observation, as no precoveries were taken, and no prior identifications were made.<ref name="MPC" />

Impact risk

Between 2002 and 2006, Template:Mp was considered to have about a 1 in 10,000 chance of colliding with Earth on 1 June 2101, based on a 27-day observation arc following its discovery.<ref name="JPL-Impact-Risk "/> With an estimated mass of Template:Val kilograms, it was ranked at level 1 on the Torino scale (0–10) of impact risk, and was the only near-Earth object to be ranked higher than zero until it was joined by Template:Mpl at level 1 in November 2004, and then when 99942 Apophis – then known only by its provisional designation Template:Mp – was temporarily assessed at level four in December 2004. Both Template:Mpl and 99942 Apophis are now rated at level zero.

Recovery

On 24 February 2006, Template:Mp was observed by the Mount Lemmon Survey after being lost for more than 8 years.<ref name="MPC" /> The refinement of its orbit eliminated the possibility of impact in 2101. It is now known that on 20 November 2101, the asteroid will be Template:Convert from Earth.<ref name=jpl-close />

Physical characteristics

According to a generic conversion of absolute magnitude to diameter, Template:Mp measures 200 to 230 meters.<ref name="h" /><ref name="JPL-Impact-Risk "/>

Naming

As of 2017, this minor planet remains unnamed.<ref name="MPC" />

External links

• Earth Impact Risk Ratings Posted in the Last 31 Days Template:Webarchive, A/CC's Consolidated Risk Tables
• Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Template:NeoDys
• Template:ESA-SSA
• Template:JPL small body