+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3430 Bradfield (1980 TF4) Classification: Main-belt Asteroid          SPK-ID: 2003430 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09856067570830045 3.2137e-08   a 2.757898467247415 1.1648e-08 au q 2.486078130780624 9.2182e-08 au i 4.428111217722457 4.2768e-06 deg node 43.213684062 4.3159e-05 deg peri 278.5135569882772 4.9095e-05 deg M 274.3365650078299 2.523e-05 deg tp 2459398.569424886410 (2021-Jul-03.06942489) 0.00011798 TDB period 1672.884037071429 4.58 1.0598e-05 2.902e-08 d yr n .2151972234908884 1.3634e-09 deg/d Q 3.029718803714206 1.2796e-08 au   Orbit Determination Parameters    # obs. used (total)      2555      data-arc span      16903 days (46.28 yr)      first obs. used      1974-04-24      last obs. used      2020-08-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43022      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 23:03:34   Additional Information  Earth MOID = 1.47843 au   Jupiter MOID = 2.23962 au   T_jup = 3.331  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.5   n/a MPO384782   diameter diameter 8.492 km 0.263 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.269   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 3430 Bradfield (1980 TF4)          Discovered 1980-Oct-09 by Shoemaker, C. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1980 TF4 = 1974 HY1 = 1976 YS7  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-26 05:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin