+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   904 Rockefellia (A918 UC) Classification: Main-belt Asteroid          SPK-ID: 2000904 [ 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 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0858830206611013 3.1304e-08   a 2.998768923943455 1.198e-08 au q 2.74122559049055 9.1837e-08 au i 15.14600644699521 4.2549e-06 deg node 197.9508147720144 1.2937e-05 deg peri 252.0804858786847 2.7884e-05 deg M 215.7281625096048 2.5618e-05 deg tp 2459960.637208571704 (2023-Jan-16.13720857) 0.00013644 TDB period 1896.762388598754 5.19 1.1366e-05 3.112e-08 d yr n .189797099607164 1.1373e-09 deg/d Q 3.256312257396359 1.3008e-08 au   Orbit Determination Parameters    # obs. used (total)      3045      data-arc span      39089 days (107.02 yr)      first obs. used      1913-10-31      last obs. used      2020-11-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43314      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:36:40   Additional Information  Earth MOID = 1.80023 au   Jupiter MOID = 2.02088 au   T_jup = 3.195  [ hide covariance matrix ] Orbital Elements at Epoch 2456187.5 (2012-Sep-17.0) TDB Reference: JPL 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09006513715524619 3.1478e-08   q 2.724251315433762 9.3089e-08 au tp 2456170.898405679371 (2012-Aug-31.39840568) 0.00012352 TDB node 198.1759049285297 1.2926e-05 deg peri 251.1640768853039 2.6761e-05 deg i 15.16282320432672 4.2589e-06 deg   Orbit Determination Parameters    # obs. used (total)      3045      data-arc span      39089 days (107.02 yr)      first obs. used      1913-10-31      last obs. used      2020-11-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43314      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 11:36:40   Additional Information  Jupiter MOID = 2.02088 au   T_jup = 3.195  Orbit Covariance (6×6)   e q tp node peri i e 9.908612913654459E-16 -2.910989606491848E-15 -5.18197176140577E-13 -2.447175466341983E-15 -9.964808961548239E-14 -2.95820198274936E-16 q -2.910989606491848E-15 8.665483668129208E-15 1.843558861026241E-12 6.289029908380362E-15 3.525102187106656E-13 8.278511172904266E-16 tp -5.18197176140577E-13 1.843558861026241E-12 1.525655988534986E-8 1.113081194381547E-11 2.905833225405358E-9 2.10682961510329E-13 node -2.447175466341983E-15 6.289029908380362E-15 1.113081194381547E-11 1.670931178509249E-10 -1.589622392369586E-10 1.901284012136812E-12 peri -9.964808961548239E-14 3.525102187106656E-13 2.905833225405358E-9 -1.589622392369586E-10 7.161404447496681E-10 -1.758979772536976E-12 i -2.95820198274936E-16 8.278511172904266E-16 2.10682961510329E-13 1.901284012136812E-12 -1.758979772536976E-12 1.813842951078252E-11 [ 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 10.45   n/a E2021B10   diameter diameter 49.146 km 0.763 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 6.826 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Polakis, T. (2018) Minor Planet Bull. 45, 199-203.] [Polakis, T. (2020) Minor Planet Bull. 47, 314-321.] geometric albedo albedo 0.055   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   904 Rockefellia (A918 UC)          Discovered 1918-Oct-29 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2066-May-02 02:23 < 00:01 Europ 0.0381391102050996 0.0381373804595601 0.0381408406123549 4.10001034197695 4.10001027400711 2475772.599399976 0.725192440043092 278.452151502249 28.0582910508141 72.8853645335062 194307.712863031 T 44 CATAB v2.0f-lin.ifort 2021-Apr-12 11:37:04 2021-Apr-12 11:37 2086-Jan-23 21:58 00:01 Eunom 0.0400299399777592 0.0400253311986138 0.0400345497058101 6.22222075608011 6.22222069972108 2482979.415093140 1.42759151524556 385.055629063169 24.8075273166559 -53.5301056239574 194254.166303043 T 44 CATAB v2.0f-lin.ifort 2021-Apr-12 11:37:04 2021-Apr-12 11:37 Alternate Designations  A918 UC = 1949 UK = 1961 AK = A913 UD = A916 KC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-May-06 01:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin