+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   136841 (1997 WU50) Classification: Main-belt Asteroid          SPK-ID: 2136841 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3744253950492566 4.1577e-08   a 2.746265232438212 1.1655e-08 au q 1.717993787872496 1.1202e-07 au i 11.27960487359278 4.6914e-06 deg node 68.21628468035571 2.1106e-05 deg peri 304.1637910998476 2.2169e-05 deg M 48.48812763808513 6.7719e-06 deg tp 2458976.604657968115 (2020-May-07.10465797) 3.0324e-05 TDB period 1662.310488313623 4.55 1.0583e-05 2.897e-08 d yr n .216566040177736 1.3787e-09 deg/d Q 3.774536677003929 1.602e-08 au   Orbit Determination Parameters    # obs. used (total)      826      data-arc span      8454 days (23.15 yr)      first obs. used      1997-11-29      last obs. used      2021-01-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50246      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 10:06:23   Additional Information  Earth MOID = .747611 au   Jupiter MOID = 1.79582 au   T_jup = 3.216  [ 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 15.3   n/a MPO436675   diameter diameter 2.176 km 0.522 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   geometric albedo albedo 0.258   0.183 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   136841 (1997 WU50)          Discovered 1997-Nov-29 by LINEAR at Socorro Reference: 20061205/Numbers.arc Last Updated: 2006-12-13 [ show close-approach data ] Alternate Designations  1997 WU50 = 2003 AJ78  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 05:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin