+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102134 (1999 RD181) Classification: Main-belt Asteroid          SPK-ID: 2102134 [ 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 .1931554102326331 3.9543e-08   a 2.37305479415545 1.3224e-08 au q 1.914686421885837 9.6396e-08 au i 2.006459393204245 4.8178e-06 deg node 55.14497468006313 0.00013329 deg peri 253.6198139302928 0.00013409 deg M 323.268005246676 1.8356e-05 deg tp 2459336.739201354386 (2021-May-02.23920135) 6.8718e-05 TDB period 1335.242281747867 3.66 1.1161e-05 3.056e-08 d yr n .269613990600081 2.2536e-09 deg/d Q 2.831423166425063 1.5778e-08 au   Orbit Determination Parameters    # obs. used (total)      460      data-arc span      7557 days (20.69 yr)      first obs. used      1999-09-07      last obs. used      2020-05-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54502      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:56:29   Additional Information  Earth MOID = .899235 au   Jupiter MOID = 2.42715 au   T_jup = 3.517  [ 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 16.43   n/a E2021B55   diameter diameter 1.376 km 0.199 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.282   0.087 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   102134 (1999 RD181)          Discovered 1999-Sep-09 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 RD181 = 1999 RL83 = 2002 JH42  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 01:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin