+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21672 Laichunju (1999 RK14) Classification: Main-belt Asteroid          SPK-ID: 2021672 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .190993131365268 3.7907e-08   a 2.554488244529883 1.174e-08 au q 2.066598535671354 9.5663e-08 au i 8.082833112158182 4.8928e-06 deg node 166.0696242506448 3.3525e-05 deg peri 237.3051925495467 3.6718e-05 deg M 344.3766202040451 1.7821e-05 deg tp 2459065.218252058952 (2020-Aug-03.71825206) 7.3975e-05 TDB period 1491.263161077023 4.08 1.028e-05 2.815e-08 d yr n .2414060840475668 1.6641e-09 deg/d Q 3.042377953388412 1.3982e-08 au   Orbit Determination Parameters    # obs. used (total)      1133      data-arc span      10633 days (29.11 yr)      first obs. used      1991-10-03      last obs. used      2020-11-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53616      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:17:35   Additional Information  Earth MOID = 1.08746 au   Jupiter MOID = 2.4075 au   T_jup = 3.399  [ 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 14.6   n/a MPO449112   diameter diameter 3.792 km 0.827 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.162   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21672 Laichunju           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Lai Chun-Ju (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for his mathematics project. He attends the Taipei Municipal Chien-Kuo Senior High School, Taipei City, 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 RK14 = 1991 TY5 = 1995 SW2 = 1997 ET18  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-26 00:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin