+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21634 Huangweikang (1999 NB18) Classification: Main-belt Asteroid          SPK-ID: 2021634 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .188399291956128 3.1875e-08   a 2.302265067959301 6.437e-09 au q 1.868519959260441 7.4503e-08 au i 6.756975257922294 3.4335e-06 deg node 69.43890864084287 2.8286e-05 deg peri 328.0877286415356 2.9618e-05 deg M 323.5733291363113 8.6282e-06 deg tp 2459329.606585021052 (2021-Apr-25.10658502) 3.0766e-05 TDB period 1275.943409198831 3.49 5.3512e-06 1.465e-08 d yr n .2821441745806306 1.1833e-09 deg/d Q 2.736010176658159 7.6497e-09 au   Orbit Determination Parameters    # obs. used (total)      1821      data-arc span      23691 days (64.86 yr)      first obs. used      1956-03-10      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48426      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:53:43   Additional Information  Earth MOID = .879345 au   Jupiter MOID = 2.68224 au   T_jup = 3.558  [ 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 14.61   n/a E2021B10   diameter diameter 3.281 km 0.208 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.285   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21634 Huangweikang           Discovered 1999 July 14 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Huang Wei-Kang (b. 1986) was awarded first place and Best in Category in the 2005 Intel International Science and Engineering Fair for his engineering team project. He also received the EU Contest for Young Scientists Award. He attends the Taipei Municipal Lishan Senior High School, Taipei, Chinese Taipei. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050822/MPCPages.arc Last Updated: 2005-08-26 [ show close-approach data ] Alternate Designations  1999 NB18 = 1975 UE1 = 1998 HZ133  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 18:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin