+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20831 Zhangyi (2000 UM47) Classification: Main-belt Asteroid          SPK-ID: 2020831 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05734180592590069 2.8703e-08   a 2.251696010898153 6.3933e-09 au q 2.122579695237107 6.409e-08 au i 2.068276803374233 3.905e-06 deg node 355.7420349346962 7.6347e-05 deg peri 311.3123327308634 8.3701e-05 deg M 80.42783768208369 3.4624e-05 deg tp 2458924.780833779572 (2020-Mar-16.28083378) 0.00011871 TDB period 1234.136123759861 3.38 5.2562e-06 1.439e-08 d yr n .2917020197927931 1.2424e-09 deg/d Q 2.3808123265592 6.7599e-09 au   Orbit Determination Parameters    # obs. used (total)      1723      data-arc span      10539 days (28.85 yr)      first obs. used      1992-04-04      last obs. used      2021-02-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50579      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:32:29   Additional Information  Earth MOID = 1.10637 au   Jupiter MOID = 2.72954 au   T_jup = 3.624  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.14   n/a E2021B10   diameter diameter 1.812 km 0.268 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.340   0.115 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20831 Zhangyi           Discovered 2000 Oct. 24 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Zhang Yi (b. 1985) was awarded second place in the 2004 Intel International Science and Engineering Fair for his environmental science team project. He also received the Intel Foundation Achievement Award. He attends the Wusong High School, Shanghai, China. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20041226/MPCPages.arc Last Updated: 2004-12-25 Alternate Designations  2000 UM47 = 1992 GD2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-21 11:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin