+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1321288700260836 3.2965e-08   a 2.18832650410266 4.9476e-09 au q 1.899185395867446 7.2155e-08 au i 5.302023171306455 4.1756e-06 deg node 31.39514835788344 4.0614e-05 deg peri 16.53612876912704 4.4182e-05 deg M 228.5942817075586 1.8019e-05 deg tp 2459432.096954219192 (2021-Aug-05.59695422) 5.9774e-05 TDB period 1182.405952632327 3.24 4.01e-06 1.098e-08 d yr n .3044639611281992 1.0326e-09 deg/d Q 2.477467612337874 5.6014e-09 au   Orbit Determination Parameters    # obs. used (total)      3301      data-arc span      47586 days (130.28 yr)      first obs. used      1890-04-16      last obs. used      2020-07-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39501      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:13:24   Additional Information  Earth MOID = .909437 au   Jupiter MOID = 2.87629 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 12.0   n/a MPO473764 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. 2019-August); 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 ] 2020-Oct-23 23:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin