(192642) 1999 RD32

Asteroid and suspected contact binary September 2020 yes (192642) 1999 RD 32 #FFC2E0 (192642) 1999 RD32.jpg Goldstone radar image showing the two lobes of suspected contact binary 1999 RD 32. LINEAR Lincoln Lab's ETS 8 September 1999 (192642) 1999 RD 32 ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 21.92 yr (8,007 days) 4.6801 AU 0.6093 AU 2.6447 AU 0.7696 4.30 yr (1,571 days) 89.009° 0.2292 ms / day 6.7914° 310.04° 299.89° 0.0495 AU19.3 LD 0.6702 AU 1.63 km (calculated–dated)5 km (est.–radiometric) 17.08 0.03 hlightcurve-plot-Warner17.1 0.5 h 0.04 (est.–radiometric)0.20 (assumed–dated) C 16.0016.23 0.0116.3 (192642) 1999 RD 32 is an asteroid and suspected contact binary on an eccentric orbit, classified as a large near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 5 km mi 1 off us in diameter. It was discovered on 8 September 1999, at a magnitude of 18, by astronomers of the LINEAR program using its 1-meter telescope at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, United States. The asteroid is likely of carbonaceous composition and has a rotation period of 17.08 hours.lightcurve-plot-Warner Description 1999 RD 32 orbits the Sun at a distance of 0.6–4.7 AU once every 4 years and 4 months (1,571 days; semi-major axis of 2.64 AU). Its orbit has a high eccentricity of 0.77 and an inclination of 7° with respect to the ecliptic. The asteroid's observation arc begins with a precovery taken at Palomar Observatory in January 1995. It is known that 1999 RD 32 passed 0.0093 AU km mi on on from Earth on 27 August 1969. During the 1969 close approach the asteroid reached about apparent magnitude 8.8. The similarly sized 4179 Toutatis also reached that brightness in September 2004. It passed less than 0.007 AU km mi on off from asteroid 29 Amphitrite on 17 January 1939. Arecibo radar observations on 5–6 March 2012 showed that 1999 RD 32 is approximately 5 km 0 us in diameter and has an estimated albedo of only 0.04. Other sources calculate a smaller diameter of 1.63 kilometers based on a dated assumption, that the object is a stony rather than a carbonaceous asteroid. The two visible lobes suggest that 1999 RD 32 is a tight binary asteroid or contact binary. About 10–15% of near-Earth asteroids larger than 200 meters are expected to be contact binary asteroids with two lobes in mutual contact. +Close-approaches to Earth Date Distance from Earth 1969-08-27 0.0093 AU km mi on on 2012-03-14 0.1487 AU km mi on off 2042-03-11 0.1428 AU km mi on off 2046-09-04 0.1071 AU km mi on off Numbering and naming This minor planet was numbered by the Minor Planet Center on 13 November 2008. As of 2018, it has not been named. Notes lightcurve-plot-Warner Lightcurve plot of (192642) 1999 RD32, Palmer Divide Observatory, B. D. Warner (2012): rotation period 17.08 0.03 hours with a brightness amplitude of 0.28 0.02 mag. Summary figures at the LCDB References 2016-12-04 last obs. JPL Small-Body Database Browser: 192642 (1999 RD32) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2192642 Jet Propulsion Laboratory 16 January 2018 192642 (1999 RD32) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=192642 16 January 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 MPEC 1999-R32 : 1999 RD32 IAU Minor Planet Center 1999-09-11 https://minorplanetcenter.net/mpec/J99/J99R32.html 2014-02-28 (J99R32D) 2012-11-03 last obs and observation arc=17.8 years JPL Close-Approach Data: 192642 (1999 RD32) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1999RD32;cad=1#cad 2014-02-28 12 March 2012 (192642) 1999 RD32 Goldstone Radar Observations Planning NASA/JPL Asteroid Radar Research http://echo.jpl.nasa.gov/asteroids/1999RD32/1999RD32_planning.html 16 January 2018 2012-03-12 Near-Earth Asteroids and Radar Speckle Tracking Michael Busch http://www.aoc.nrao.edu/events/nmsymposium/2012/talks/Busch_2012_New_Mexico_Symposium.pdf 2014-02-28 1999RD32 Ephemerides for 25 August 1969 through 31 August 1969 NEODyS (Near Earth Objects – Dynamic Site) http://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=192642&oc=500&y0=1969&m0=8&d0=25&h0=0&mi0=0&y1=1969&m1=8&d1=31&h1=0&mi1=0&ti=3.0&tiu=hours 2014-02-28 192642 16 January 2018 Brian D. Warner Ralph Megna July 2012 Lightcurve Analysis of NEA (192642) 1999 RD32 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39..154W The Minor Planet Bulletin 39 3 154 1052-8091 2012MPBu...39..154W 16 January 2018 6 O. Vaduvescu A. Aznar Macias V. Tudor M. Predatu A. Galád S. Gajdos J. Világi H. F. Stevance R. Errmann E. Unda-Sanzana F. Char N. Peixinho M. Popescu A. Sonka R. Cornea O. Suciu R. Toma P. Santos-Sanz A. Sota J. Licandro M. Serra-Ricart D. Morate T. Mocnik M. Diaz Alfaro F. Lopez-Martinez J. McCormac N. Humphries August 2017 The EURONEAR Lightcurve Survey of Near Earth Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017EM&P..120...41V Earth 120 2 41–100 2017EM&P..120...41V 10.1007/s11038-017-9506-9 16 January 2018 10316/80202 free B. Carry E. Solano S. Eggl F. E. DeMeo April 2016 Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016Icar..268..340C Icarus 268 340–354 2016Icar..268..340C 10.1016/j.icarus.2015.12.047 1601.02087 16 January 2018 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 16 January 2018 External links Arecibo images from 2012 Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books 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 192642 192642 1999 RD32 192642 192642 (192642) 1999 RD 32 192642 192642 192642 192642 192642 20120314 19990908