+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21674 Renaldowebb (1999 RG18) Classification: Main-belt Asteroid          SPK-ID: 2021674 [ 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 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .134924948679464 3.5166e-08   a 2.622084422160948 1.059e-08 au q 2.26829981606766 9.6055e-08 au i 15.58275235454509 3.9361e-06 deg node 153.5252735866415 1.119e-05 deg peri 229.6599251001851 1.786e-05 deg M 335.6450016767638 1.4676e-05 deg tp 2459305.418974167448 (2021-Mar-31.91897417) 6.3391e-05 TDB period 1550.845136550287 4.25 9.3953e-06 2.572e-08 d yr n .2321314949607328 1.4063e-09 deg/d Q 2.975869028254235 1.2019e-08 au   Orbit Determination Parameters    # obs. used (total)      1928      data-arc span      8736 days (23.92 yr)      first obs. used      1997-02-18      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47388      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:53:55   Additional Information  Earth MOID = 1.29595 au   Jupiter MOID = 2.54547 au   T_jup = 3.339  [ 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 14.17   n/a E2021B10   diameter diameter 4.073 km 0.882 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.267   0.127 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21674 Renaldowebb           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Renaldo Michael Webb (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for his physics project. He attends the Louisiana School for Mathematics, Science, and the Arts, Natchitoches, Louisiana, U.S.A. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20060711/MPCPages.arc Last Updated: 2006-07-17 [ show close-approach data ] Alternate Designations  1999 RG18 = 1998 KN59  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-13 06:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin