+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   281 Lucretia (A888 UC) Classification: Main-belt Asteroid          SPK-ID: 2000281 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1317382182153103 1.6556e-08   a 2.188285184927328 4.2556e-09 au q 1.900004393718041 3.6303e-08 au i 5.301411472486432 1.0434e-06 deg node 31.35317577412052 9.5122e-06 deg peri 16.61560437127802 1.0604e-05 deg M 289.4038310565043 9.7244e-06 deg tp 2459432.363795094308 (2021-Aug-05.86379509) 3.217e-05 TDB period 1182.372464159635 3.24 3.4491e-06 9.443e-09 d yr n .3044725844963482 8.8818e-10 deg/d Q 2.476565976136615 4.8163e-09 au   Orbit Determination Parameters    # obs. used (total)      3446      data-arc span      47722 days (130.66 yr)      first obs. used      1890-04-16      last obs. used      2020-12-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .39056      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:38:14   Additional Information  Earth MOID = .909349 au   Jupiter MOID = 2.87693 au   T_jup = 3.658  [ 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 11.90   n/a E2021B10 IRAS observations used: 6 magnitude slope G 0.28   n/a PDS3 (MPC 17258) Fit diameter diameter 11.036 km 0.145 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 4.348 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Taylor, R.C.; Gehrels, T.; Capen, R.C. (1976) Astron. J. 81, 778-786.] [Durech, J. (2006) IAU 2006, poster paper.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] geometric albedo albedo 0.226   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.918   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=6.59, mean=14.10, max.=21.70) deg. U-B UB 0.530   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=6.59, mean=12.63, max.=21.03) deg. Tholen spectral type spec_T SU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B S   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) 281 Lucretia (A888 UC)          Discovered 1888-Oct-31 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A888 UC = 1948 EK = 1984 JX = A906 FD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 09:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin