2009 BD

Small near-Earth asteroid October 2026 2009 BD #FFC2E0 2009 BD http://www.minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=2009+BD Minor Planet Center 20 June 2011 Mount Lemmon Survey 16 January 2009 Catalina Mountains north of Tucson, Arizona, USA 2009 BD NEOApollo MPO 201128 last observation: 20 June 2011; arc: 885 days JPL Small-Body Database Browser: (2009 BD) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009%20BD Jet Propulsion Laboratory 30 March 2016 21 November 2025 (JD 2461000.5) 1 885 days (2.42 yr) 1.11723387 AU Gm on on 1.00697053 AU Gm on 1.06210220 AU Gm on 0.05190806 1.095 yr (399.80 d) 1.26733118° 253.15632° 119.74017° 316.65987° 0.00322842 AU km on ~640 kg/m3 g/cm3 out 7–15 mABSOLUTE MAGNITUDE (H) 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 NASA 28.128.43 ± 0.12 0.90043966 ms /day 2009 BD is a very small asteroid, approximately 10 meters in diameter, which is classified as a near-Earth object of the Apollo group and as an Earth co-orbital asteroid. Orbit During the 2011 opposition, the last opposition of 2009 BD that was observed, 2009 BD approached on 2 June 2011 within 0.00231 AU (346,000 km) of the Earth, which is less than 1 lunar distance. For comparison, the distance to the Moon is about 0.0026 AU (384,400 km). With an orbital period of 399.80 days, 2009 BD is in a near 1:1 orbital resonance with Earth, and also has about the same orbit around the Sun as Earth. Other resonant near-Earth objects in addition to 2009 BD include 3753 Cruithne (the first to be discovered), (85770) 1998 UP 1, 54509 YORP, 2001 GO 2, 2002 AA 29, 2003 YN 107, 164207 Cardea, and (706765) 2010 TK 7 (an Earth trojan). The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 5.801. The orbit has a small inclination of about 1.27 degrees. JPL and MPC give different parameters for the orbit of 2009 BD, affecting whether the orbit type should be considered an Apollo asteroid or an Amor asteroid. JPL includes non-gravitational acceleration parameters in the orbital solution. Physical characteristics Because 2009 BD is a very small multi-opposition near-Earth object, the effect of radiation pressure on the orbit caused by light from the Sun was able to be detected.2012NewA...17..446M 10.1016/j.newast.2011.11.008 Detection of radiation pressure acting on 2009 BD 1106.0564 New Astronomy 17 4 446–452 2012 Micheli Marco Tholen David J. Elliott Garrett T. 119185066 The radiation-related acceleration allowed the Area to Mass Ratio (AMR) to be estimated at (2.97 ± 0.33) × 10−4 m2/kg. Assuming an albedo of 0.12, a typical average for asteroids in the inner solar system, this AMR corresponds to a density of about 640 kg/m3. This density is consistent with the density of very porous rock. For comparison, the asteroid 2006 RH 120 has a measured density of about 400 kg/m3, and the density of the asteroid 253 Mathilde as measured by the NEAR-Shoemaker space probe was 1300 kg/m3. In contrast, the density of the man-made near-Earth object 6Q0B44E is 15 kg/m3. References External links 2009+BD 2009BD # # Category:Minor planet object articles (unnumbered) Category:Earth-crossing asteroids # 20110602 20090116