+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   38 Leda (A856 AA) Classification: Main-belt Asteroid          SPK-ID: 2000038 [ 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 110 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1545582261735973 3.5132e-08   a 2.738864100284506 5.7947e-09 au q 2.315550123213987 9.5709e-08 au i 6.971256190203162 3.7986e-06 deg node 295.7221147478364 3.1508e-05 deg peri 169.24581651 3.368e-05 deg M 135.4826209817798 1.2349e-05 deg tp 2458577.432295398489 (2019-Apr-03.93229540) 5.6273e-05 TDB period 1655.5951754632 4.53 5.2542e-06 1.439e-08 d yr n .2174444606600642 6.9008e-10 deg/d Q 3.162178077355025 6.6904e-09 au   Orbit Determination Parameters    # obs. used (total)      2960      data-arc span      60143 days (164.66 yr)      first obs. used      1856-01-29      last obs. used      2020-09-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42253      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:34:05   Additional Information  Earth MOID = 1.33265 au   Jupiter MOID = 1.97525 au   T_jup = 3.323  [ hide covariance matrix ] Orbital Elements at Epoch 2454670.5 (2008-Jul-23.0) TDB Reference: JPL 110 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1533102575042689 3.5203e-08   q 2.320473346544391 9.5635e-08 au tp 2455267.397130327686 (2010-Mar-11.89713033) 5.55e-05 TDB node 295.7932866398621 3.148e-05 deg peri 169.59156330908 3.3683e-05 deg i 6.973090152951483 3.7996e-06 deg   Orbit Determination Parameters    # obs. used (total)      2960      data-arc span      60143 days (164.66 yr)      first obs. used      1856-01-29      last obs. used      2020-09-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42253      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:34:05   Additional Information  Jupiter MOID = 1.97525 au   T_jup = 3.323  Orbit Covariance (6×6)   e q tp node peri i e 1.239276260978022E-15 -3.362052445041078E-15 -3.458114119526414E-13 -2.967245264991186E-15 -8.030038577671316E-14 -7.333266186083552E-18 q -3.362052445041078E-15 9.146059101240703E-15 9.415155631032963E-13 8.644160219349042E-15 2.139680791679311E-13 -7.163482203778065E-17 tp -3.458114119526414E-13 9.415155631032963E-13 3.080269936274005E-9 -7.312950973334948E-12 6.824877428311042E-10 -1.847242325087081E-13 node -2.967245264991186E-15 8.644160219349042E-15 -7.312950973334948E-12 9.910104388349239E-10 -9.847219626558124E-10 -1.968619724832661E-11 peri -8.030038577671316E-14 2.139680791679311E-13 6.824877428311042E-10 -9.847219626558124E-10 1.134573110250801E-9 1.949086880772798E-11 i -7.333266186083552E-18 -7.163482203778065E-17 -1.847242325087081E-13 -1.968619724832661E-11 1.949086880772798E-11 1.443663610324857E-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 8.55   n/a E2021B10 IRAS observations used: 25 diameter diameter 92.255 km 0.490 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 12.838 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [De Young, J.A.; Schmidt, R.E. (1996) Minor Planet Bull. 23, 44.] [Pilcher, F. (2009) Minor Planet Bull. 36, 25-27.] [Pilcher, F. (2010) Minor Planet Bull. 37, 119-122.] [Pilcher, F. (2011) Minor Planet Bull. 38, 183-185.] [Franco, L.; Pilcher, F.; Durech, J. (2013) Minor Planet Bull. 40, 229-231.] [Pilcher, F. (2013) Minor Planet Bull. 40, 33.] geometric albedo albedo 0.055   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.726   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.56, mean=11.52, max.=18.34) deg. U-B UB 0.419   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=4.56, mean=11.52, max.=18.34) deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Cgh   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) 38 Leda (A856 AA)          Discovered 1856-Jan-12 by Chacornac, J. at Paris 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 1985-Sep-02 23:55 < 00:01 Jupiter 1.99102620865646 1.99102592710211 1.99102649021082 3.07159649617146 2.92982335448943 2446311.496322589 0.241593431774037 94.1001399063952 10.782922882008 87.5209138493712 4259906.23161405 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34 2044-Jun-04 10:01 < 00:01 Jupiter 1.99255923532872 1.99255893689454 1.99255953376302 3.06397272610281 2.92194170634204 2467770.917279357 0.368509494910782 83.5046496381406 10.0211452652274 85.0950736225166 3969141.26653777 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34 2140-Jan-18 22:13 00:01 Jupiter 1.9887865194957 1.98878620327978 1.98878683571173 3.00843740765181 2.86337166780328 2502696.425785922 1.25115879112733 115.292559690447 11.9582839393738 86.4923648492286 4075455.32798635 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34 2198-Oct-20 03:12 00:02 Jupiter 1.97518072277107 1.9751803675208 1.97518107802145 3.0187161914326 2.87314837860755 2524155.633363518 1.77247284040633 92.8007493409169 11.6196560000264 84.8929496232372 3506686.36420363 T 110 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:12 2020-Nov-13 04:34 Alternate Designations  A856 AA = 1949 QO2 = A904 SF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 09:32 UT (server date/time)   Site Manager:   Ryan S. 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