+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   308635 (2005 YU55) Classification: Apollo [NEO, PHA]          SPK-ID: 2308635 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 130 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4305588716168578 1.6427e-09   a 1.157113899594999 4.0879e-09 au q .6589082446531941 2.5729e-09 au i .3402453412260451 1.1612e-06 deg node 35.91984441292271 4.066e-05 deg peri 273.5848485310565 4.0634e-05 deg M 160.5509757053758 1.5555e-05 deg tp 2458997.744314550183 (2020-May-28.24431455) 1.857e-05 TDB period 454.6347130015611 1.24 2.4092e-06 6.596e-09 d yr n .7918445066001017 4.1962e-09 deg/d Q 1.655319554536804 5.8479e-09 au   Orbit Determination Parameters    # obs. used (total)      3993      # delay obs. used      9      # Doppler obs. used      10      data-arc span      4019 days (11.00 yr)      first obs. used      2005-12-24      last obs. used      2016-12-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .21898      source      ORB      producer      Otto Matic      solution date      2021-Apr-14 06:07:57   Additional Information  Earth MOID = .000451408 au   Jupiter MOID = 3.61934 au   T_jup = 5.348  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 21.9   n/a MPO254628   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   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 Reference: 20111210/Numbers.arc Last Updated: 2011-12-12 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 02:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin