+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   746 Marlu (A913 EJ) Classification: Main-belt Asteroid          SPK-ID: 2000746 [ 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 95 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2369102740773152 3.637e-08   a 3.109424909475487 1.2541e-08 au q 2.372770201948819 1.1372e-07 au i 17.48015148786149 4.6442e-06 deg node 1.938518783416216 1.1934e-05 deg peri 306.7896730996166 1.4612e-05 deg M 60.35220901955683 8.9916e-06 deg tp 2458664.755268104470 (2019-Jun-30.25526810) 4.9689e-05 TDB period 2002.712169876404 5.48 1.2116e-05 3.317e-08 d yr n .1797562352767932 1.0875e-09 deg/d Q 3.846079617002156 1.5512e-08 au   Orbit Determination Parameters    # obs. used (total)      3168      data-arc span      38410 days (105.16 yr)      first obs. used      1915-09-12      last obs. used      2020-11-09      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40413      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:55:50   Additional Information  Earth MOID = 1.40405 au   Jupiter MOID = 1.74409 au   T_jup = 3.106  [ 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 9.8   n/a MPO502160 IRAS observations used: 14 diameter diameter 74.274 km 1.122 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 7.787 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Klinglesmith, D.A.; Dehart, A.; Hanowell, J.; Henderickx, S. (2015) Minor Planet Bull. 42, 101-104.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.032   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.726   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=12.94 deg. U-B UB 0.283   0.050 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=12.94 deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 746 Marlu (A913 EJ)          Discovered 1913-Mar-01 by Kaiser, F. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A913 EJ = 1926 WA = 1975 XN  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 01:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin