(433953) 1997 XR2

Near-Earth asteroid September 2020 yes (433953) 1997 XR 2 #FFC2E0 4 December 1997 LINEAR Lincoln Lab's ETS (433953) 1997 XR 2 ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 19.20 yr (7,014 days) 1.2924 AU 0.8601 AU 1.0762 AU 0.2008 1.12 yr (408 days) 316.19° 0.8828 ms / day 7.1919° 250.69° 84.604° 0.000135 AU0.05 LD 0.2 km (generic)0.23 km 1.7e10 kg 20.8 (433953) 1997 XR 2 is a sub-kilometer sized asteroid, classified as a 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. 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. The body's observation arc begins with its official discovery observation, as no precoveries were taken, and no prior identifications were made. Impact risk Between 2002 and 2006, 1997 XR 2 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. With an estimated mass of 1.7e10 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 2004 VD 17 at level 1 in November 2004, and then when 99942 Apophis – then known only by its provisional designation 2004 MN 4 – was temporarily assessed at level four in December 2004. Both 2004 VD 17 and 99942 Apophis are now rated at level zero. Recovery On 24 February 2006, 1997 XR 2 was observed by the Mount Lemmon Survey after being lost for more than 8 years. 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 0.0392 AU km on on from Earth. Physical characteristics According to a generic conversion of absolute magnitude to diameter, 1997 XR 2 measures 200 to 230 meters. Naming As of 2017, this minor planet remains unnamed. References 30em 2017-02-16 last obs. JPL Small-Body Database Browser: 433953 (1997 XR2) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2433953 Jet Propulsion Laboratory 2 June 2017 433953 (1997 XR2) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=433953 1 March 2017 1997 XR2 Earth Impact Risk Summary Wayback Machine http://neo.jpl.nasa.gov/risk/1997xr2.html 2013-01-13 dead https://web.archive.org/web/20060207190049/http://neo.jpl.nasa.gov/risk/1997xr2.html 7 February 2006 last observation: 2007-01-15; arc: 9.1 years JPL Close-Approach Data: (1997 XR2) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1997XR2;cad=1#cad 2013-09-03 Absolute Magnitude (H) NASA/JPL http://neo.jpl.nasa.gov/glossary/h.html https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html dead 2 March 2001 1 March 2017 External links Earth Impact Risk Ratings Posted in the Last 31 Days https://web.archive.org/web/20071005041238/http://www.hohmanntransfer.com/crt.htm#news 5 October 2007 , A/CC's Consolidated Risk Tables Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend 433953 433953 1997XR2 433953 433953 (433953) 1997 XR 2 433953 433953 433953 433953 19971204