+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   890 Waltraut (A918 EO) Classification: Main-belt Asteroid          SPK-ID: 2000890 [ 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 .0603188215998748 3.7066e-08   a 3.021049445443737 1.3582e-08 au q 2.838823302899616 1.1507e-07 au i 10.87618610994541 4.2919e-06 deg node 160.5296553772885 2.1437e-05 deg peri 88.2150764231188 4.1877e-05 deg M 79.27835666242528 3.581e-05 deg tp 2458578.135590345730 (2019-Apr-04.63559035) 0.00019049 TDB period 1917.94070761312 5.25 1.2934e-05 3.541e-08 d yr n .187701318696145 1.2658e-09 deg/d Q 3.203275587987859 1.4402e-08 au   Orbit Determination Parameters    # obs. used (total)      2679      data-arc span      37341 days (102.23 yr)      first obs. used      1918-03-11      last obs. used      2020-06-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42288      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:22:27   Additional Information  Earth MOID = 1.85291 au   Jupiter MOID = 1.86175 au   T_jup = 3.216  [ 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 10.5   n/a MPO502161 IRAS observations used: 3 diameter diameter 28.376 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 12.581 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Brinsfield, J.W. (2010) Minor Planet Bull. 37, 19-20.] [Owings, L.E. (2010) Minor Planet Bull. 37, 138.] [Blaauw, R.C.; Cooke, W.J.; Suggs, R.M. (2011) Minor Planet Bull. 38, 131-132.] [Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2016) Astron. Astrophys., submitted.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2018) Icarus 299, 84-96.] [Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2018) Icarus 309, 297-337.] geometric albedo albedo 0.121   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.770   0.069 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.74, mean=6.89, max.=6.97) deg. U-B UB 0.330   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=6.74, mean=6.89, max.=6.97) deg. Tholen spectral type spec_T CTGU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo 890 Waltraut (A918 EO)          Discovered 1918-Mar-11 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A918 EO = A908 GA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-04 04:01 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin