+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19657 (1999 RE123) Classification: Main-belt Asteroid          SPK-ID: 2019657 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07862642984611323 1.58e-08   a 2.35325519383344 7.8893e-09 au q 2.168227139425493 3.8567e-08 au i 6.254321028804875 6.5284e-07 deg node 287.0459815103265 5.5851e-06 deg peri 323.6568175373877 1.1217e-05 deg M 51.44758113645078 1.0792e-05 deg tp 2459012.063761815960 (2020-Jun-11.56376182) 3.949e-05 TDB period 1318.566281402717 3.61 6.6307e-06 1.815e-08 d yr n .2730238176703752 1.373e-09 deg/d Q 2.538283248241386 8.5096e-09 au   Orbit Determination Parameters    # obs. used (total)      2289      data-arc span      15787 days (43.22 yr)      first obs. used      1977-07-20      last obs. used      2020-10-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45284      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:00:55   Additional Information  Earth MOID = 1.15543 au   Jupiter MOID = 2.50457 au   T_jup = 3.544  [ 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 13.64   n/a E2021B10   diameter diameter 4.373 km 0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.254   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19657 (1999 RE123)          Discovered 1999-Sep-09 by LINEAR at Socorro Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 RE123 = 1998 FK104  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 00:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin