+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21783 (1999 RR248) Classification: Main-belt Asteroid          SPK-ID: 2021783 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06444902294963263 3.4676e-08   a 2.648488230862502 1.3993e-08 au q 2.477795752089813 9.1722e-08 au i 4.000572542225143 3.7136e-06 deg node 118.6435283003801 7.7361e-05 deg peri 348.564458556245 9.0385e-05 deg M 201.2927034576188 4.5781e-05 deg tp 2459894.548613593057 (2022-Nov-11.04861359) 0.00020047 TDB period 1574.329009043253 4.31 1.2476e-05 3.416e-08 d yr n .2286688474468105 1.8122e-09 deg/d Q 2.819180709635191 1.4894e-08 au   Orbit Determination Parameters    # obs. used (total)      1061      data-arc span      10484 days (28.70 yr)      first obs. used      1991-10-07      last obs. used      2020-06-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54216      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:55:00   Additional Information  Earth MOID = 1.49458 au   Jupiter MOID = 2.24606 au   T_jup = 3.385  [ 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 14.89   n/a E2021B10   diameter diameter 3.410 km 0.205 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.200   0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21783 (1999 RR248)          Discovered 1999-Sep-07 by Spacewatch at Kitt Peak Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 RR248 = 2000 WG180  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 20:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin