(523972) 1999 CW8

Main-belt asteroid May 2019 yes (523972) 1999 CW 8 #FFC2E0 Celestia 1999 CW8 orbit.png Orbital diagram of 1999 CW 8 LINEAR Lincoln Laboratory ETS 12 February 1999 (523972) 1999 CW 8 NEOApollo 27 April 2019 (JD 2458600.5) 0 20.05 yr (7,322 d) 3.5757 AU 0.8954 AU 2.2355 AU 0.5995 3.34 yr (1,221 d) 353.67° 0.2949 ms / day 33.645° 317.00° 262.11° 0.23 AU (90.2 LD) 0.074 AU 0.64 km (est at 0.159) SMASS B 18.6 523972 1999 CW 8 is a bright carbonaceous asteroid and sub-kilometer near-Earth object of the Apollo group, first observed on 12 February 1999, by astronomers of the Lincoln Near Earth Asteroid Research program at Lincoln Laboratory ETS in New Mexico, United States. Numbering and naming This minor planet was numbered by the Minor Planet Center on 18 May 2019 (M.P.C. 114615). As of 2019, it has not been named. Orbit and classification 200px|thumb|left|The orbit of 1999 CW 8, showing its inclination above the plane of the Solar System 1999 CW 8 is an Apollo asteroid that crosses Earth's orbit. It orbits the Sun at a distance of 0.9–3.6 AU once every 3 years and 4 months (1,221 days; semi-major axis of 2.24 AU). Its orbit has an eccentricity of 0.60 and an inclination of 34° with respect to the ecliptic. The asteroid never approaches Earth closer than 0.2 AU in the foreseeable future, but occasionally makes close approaches to Mars of 0.07 AU. It makes one such approach in 2073, at 0.067 AU, and another one in 2103, at 0.094 AU. Due to 1999 CW 8's relatively high inclination, although it passes closer to the Sun than the Earth (0.9 AU), it never comes closer than 0.2 AU. Physical characteristics It is a carbonaceous B-type asteroid, relatively rare in the asteroid belt but common in the inner Solar System. Based on an absolute magnitude of 18.6, and an assumed albedo of 0.159 (derived from the B-type asteroid 2 Pallas), the asteroid can be estimated to have a mean diameter of approximately 640 meters. If it impacted the Earth would cause significant damage, but not as much as the Cretaceous–Paleogene extinction event progenitor, which brought about a mass extinction, as it is only 1/20 to 1/10 the size. However, it is unlikely to come close enough to Earth to impact it, or even become a risk of impact. See also Mars-crossing asteroid References 2019-03-01 last obs. JPL Small-Body Database Browser: (1999 CW8) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3019066 Jet Propulsion Laboratory 29 May 2019 (523972) 1999 CW8 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1999+CW8 29 May 2019 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 29 May 2019 Asteroid Size Estimator CNEOS – NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 16 October 2017 External links 1999+CW8 523972 1999CW8 3019066 523972 (523972) 1999 CW 8 523972 523972 523972 19990212