+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   308635 (2005 YU55) Classification: Apollo [NEO, PHA]          SPK-ID: 2308635 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 118 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4304784360109137 1.8163e-09   a 1.157365898663562 8.5341e-09 AU q .659144836714506 3.9467e-09 AU i .340591506941859 7.8196e-07 deg node 35.90151585509064 2.672e-05 deg peri 273.6028889701172 2.6459e-05 deg M 103.6358626726919 5.3699e-06 deg tp 2456269.578185482517 (2012-Dec-08.07818548) 5.3358e-06 JED period 454.7832382613362 1.25 5.0302e-06 1.377e-08 d yr n .7915859022779769 8.7555e-09 deg/d Q 1.655586960612617 1.2208e-08 AU   Orbit Determination Parameters    # obs. used (total)      3505      # delay obs. used      9      # Doppler obs. used      10      data-arc span      2183 days (5.98 yr)      first obs. used      2005-12-24      last obs. used      2011-12-16      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .31506      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:41:34   Additional Information  Earth MOID = .000463764 AU   T_jup = 5.347  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 21.1 mag .1 The Astronomer's Telegram, #3763   magnitude slope G -0.12   n/a The Astronomer's Telegram, #3763   diameter diameter 0.4 km n/a 2010 radar result http://echo.jpl.nasa.gov/asteroids/2005YU55/2005YU55_planning.html rotation period rot_per 18 h n/a 2010 radar result http://echo.jpl.nasa.gov/asteroids/2005YU55/2005YU55_planning.html SMASSII spectral type spec_B C type   n/a M. Hicks et al., ATel 2571, 2010 also R. Binzel, personal communication 308635 (2005 YU55)          Discovered 2005-Dec-28 by Spacewatch at Kitt Peak (691) Reference: 20111210/Numbers.arc Last Updated: 2011-12-12 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-23 08:50 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin