(101869) 1999 MM

Sub-kilometer asteroid on an eccentric orbit October 2019 yes (101869) 1999 MM #FFC2E0 20 June 1999 LONEOS Anderson Mesa Stn. (101869) 1999 MM ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 8.67 yr (3,167 days) 2.6168 AU 0.6319 AU 1.6243 AU 0.6110 2.07 yr (756 days) 254.72° 0.4761 ms / day 4.7642° 110.98° 268.77° 0.0016 AU (0.6 LD) 370–830 m 19.3 (101869) 1999 MM is a sub-kilometer asteroid on an eccentric orbit, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group. It was discovered on 20 June 1999, by the Lowell Observatory Near-Earth-Object Search (LONEOS) at its U.S. Anderson Mesa Station in Flagstaff, Arizona. The first observation was made by Catalina Sky Survey just 8 days before its official discovery. Orbit and classification The asteroid orbits the Sun at a distance of 0.6–2.6 AU once every 2 years and 1 month (756 days). Its orbit has an eccentricity of 0.61 and an inclination of 5° with respect to the ecliptic. It has a notably low Earth minimum orbit intersection distance of 0.0016 AU km on in, which is less than one lunar distance, and also approaches Mars and Venus to within 15 million kilometers. 1999 MM's orbit is very similar to that of 69230 Hermes, which in 1937 made what was for decades the closest observed approach to Earth by an asteroid. Its nearest pass to Earth within at least a century of present was the 930,000 kilometers one in 1875. In 2090 it passes Venus at 788,000 kilometers. Physical characteristics Based on its absolute magnitude of 19.3, its mean diameter is between 370 and 830 meters, assuming an albedo in the range of 0.05 to 0.25. Numbering and naming This minor planet was numbered by the Minor Planet Center on 19 October 2005. As of 2018, it has not been named. References 30em 2008-02-12 last obs. JPL Small-Body Database Browser: 101869 (1999 MM) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2101869 Jet Propulsion Laboratory 1 June 2017 101869 (1999 MM) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=101869 2 February 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 2 February 2018 External links MPEC from 1999 discovery MPEC from 2001 Discovery Circumstances: Numbered Minor Planets (100001)-(105000) – Minor Planet Center List of the Potentially Hazardous Asteroids (PHAs), Minor Planet Center 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 101869 101869 1999MM 101813 Elizabethmarston 101869 101902 Gisellaluccone 101869 101869 101869 19990620