+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1911639921364488 3.7347e-08   a 2.555043865041926 1.0485e-08 au q 2.06661147971677 9.3416e-08 au i 8.082649398484548 4.5624e-06 deg node 166.0664762673484 3.338e-05 deg peri 237.3218104077707 3.6133e-05 deg M 32.63779027094122 1.5009e-05 deg tp 2459065.257181128716 (2020-Aug-03.75718113) 6.2072e-05 TDB period 1491.74972905597 4.08 9.1827e-06 2.514e-08 d yr n .241327343982707 1.4855e-09 deg/d Q 3.043476250367082 1.249e-08 au   Orbit Determination Parameters    # obs. used (total)      1302      data-arc span      10745 days (29.42 yr)      first obs. used      1991-10-03      last obs. used      2021-03-04      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50899      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:51:28   Additional Information  Earth MOID = 1.08648 au   Jupiter MOID = 2.40745 au   T_jup = 3.398  [ 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 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2094-Aug-31 07:57 00:05 Hebe 0.0395324182616258 0.0395283104220139 0.0395365309968353 3.13015941129659 3.13015936105797 2486120.831019784 4.73083770509665 728.753328245895 27.5675686701473 -73.8195874075465 205826.778348793 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 03:51:32 2021-Apr-13 03:51 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-Apr-14 06:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin