+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   5649 Donnashirley (1990 WZ2) Classification: Mars-crossing Asteroid          SPK-ID: 2005649 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3367847253966891 3.6122e-08   a 2.280510678317463 1.1488e-08 au q 1.512469515756099 8.2398e-08 au i 21.72282043166886 8.3761e-06 deg node 3.438753788878103 1.033e-05 deg peri 62.5535689599068 1.6805e-05 deg M 193.3673222200386 1.4232e-05 deg tp 2459582.742985018104 (2022-Jan-03.24298502) 5.2506e-05 TDB period 1257.901375643164 3.44 9.5046e-06 2.602e-08 d yr n .2861909581869503 2.1624e-09 deg/d Q 3.048551840878827 1.5356e-08 au   Orbit Determination Parameters    # obs. used (total)      936      data-arc span      16069 days (43.99 yr)      first obs. used      1975-06-08      last obs. used      2019-06-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47152      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:41:51   Additional Information  Earth MOID = .623723 au   Jupiter MOID = 2.68276 au   T_jup = 3.440  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.6   n/a MPO381304   diameter diameter 2.600 km 0.549 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   geometric albedo albedo 0.380   0.222 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   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) 5649 Donnashirley (1990 WZ2)          Discovered 1990-Nov-18 by Helin, E. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 23:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin