+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21129 (1993 BJ7) Classification: Main-belt Asteroid          SPK-ID: 2021129 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07726697578476516 1.759e-08   a 2.605706123514094 9.9309e-09 au q 2.404371091566316 4.4382e-08 au i 15.22266713585438 5.0243e-07 deg node 140.8151986289921 3.008e-06 deg peri 103.9690031256883 1.586e-05 deg M 121.5622486610005 1.3827e-05 deg tp 2458681.720505614751 (2019-Jul-17.22050561) 5.8262e-05 TDB period 1536.337308957711 4.21 8.783e-06 2.405e-08 d yr n .2343235420379349 1.3396e-09 deg/d Q 2.807041155461872 1.0698e-08 au   Orbit Determination Parameters    # obs. used (total)      2250      data-arc span      10245 days (28.05 yr)      first obs. used      1993-01-23      last obs. used      2021-02-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47476      source      ORB      producer      Otto Matic      solution date      2021-Mar-17 02:54:27   Additional Information  Earth MOID = 1.43879 au   Jupiter MOID = 2.33516 au   T_jup = 3.358  [ 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 13.61   n/a E2021B10   diameter diameter 5.130 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.222   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21129 (1993 BJ7)          Discovered 1993-Jan-23 by Elst, E. W. at La Silla Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1993 BJ7 = 1998 KM59 = 1999 RC220  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-13 06:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin