+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   886 Washingtonia (A917 WA) Classification: Main-belt Asteroid          SPK-ID: 2000886 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2704085661714193 3.7489e-08   a 3.170136176102496 1.2758e-08 au q 2.312904198154474 1.2022e-07 au i 16.86413247110114 4.1322e-06 deg node 58.88651175982088 1.404e-05 deg peri 302.1629278429506 1.5384e-05 deg M 101.7637080514572 7.9975e-06 deg tp 2458417.718540628254 (2018-Oct-26.21854063) 4.4445e-05 TDB period 2061.651736076105 5.64 1.2445e-05 3.407e-08 d yr n .1746172710455839 1.0541e-09 deg/d Q 4.027368154050518 1.6208e-08 au   Orbit Determination Parameters    # obs. used (total)      3729      data-arc span      40187 days (110.03 yr)      first obs. used      1910-06-03      last obs. used      2020-06-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .32571      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:22:27   Additional Information  Earth MOID = 1.36071 au   Jupiter MOID = 1.68216 au   T_jup = 3.080  [ hide covariance matrix ] Orbital Elements at Epoch 2456490.5 (2013-Jul-17.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2638507632104917 3.6901e-08   q 2.33863822371651 1.1685e-07 au tp 2456345.444792658159 (2013-Feb-21.94479266) 4.3698e-05 TDB node 59.57664057501225 1.4046e-05 deg peri 300.8318379919119 1.5568e-05 deg i 16.83918554336491 4.1247e-06 deg   Orbit Determination Parameters    # obs. used (total)      3729      data-arc span      40187 days (110.03 yr)      first obs. used      1910-06-03      last obs. used      2020-06-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .32571      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:22:27   Additional Information  Jupiter MOID = 1.68216 au   T_jup = 3.080  Orbit Covariance (6×6)   e q tp node peri i e 1.361672607307483E-15 -4.297962213286965E-15 2.121833248226094E-13 3.429135765265617E-16 1.724017826475934E-14 1.751965215118601E-15 q -4.297962213286965E-15 1.365357660576302E-14 -6.211187610339537E-13 1.197872219271936E-15 -4.97800602294375E-14 -3.925462483025794E-15 tp 2.121833248226094E-13 -6.211187610339537E-13 1.909558146975661E-9 -4.345265554954296E-12 3.241047077501521E-10 -3.783792453012959E-12 node 3.429135765265617E-16 1.197872219271936E-15 -4.345265554954296E-12 1.972842970306963E-10 -1.886438322394537E-10 -6.452869834263411E-12 peri 1.724017826475934E-14 -4.97800602294375E-14 3.241047077501521E-10 -1.886438322394537E-10 2.423552938948846E-10 5.620743909980525E-12 i 1.751965215118601E-15 -3.925462483025794E-15 -3.783792453012959E-12 -6.452869834263411E-12 5.620743909980525E-12 1.701282502616878E-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 9.3   n/a MPO236394   diameter diameter 86.793 km 0.857 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 9.001 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Warner, B.D. (2003) Minor Planet Bull. 30, 61-64.] geometric albedo albedo 0.078   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B C   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) 886 Washingtonia (A917 WA)          Discovered 1917-Nov-16 by Peters, G. H. at Washington Independent discovery Nov. 12 by M. Harwood, Nantucket. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A917 WA = 1945 WA = 1952 BN = A910 LA = A916 NA = A917 UD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-27 01:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin