+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1660 Wood (1953 GA) Classification: Main-belt Asteroid          SPK-ID: 2001660 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3011165999457784 2.4713e-08   a 2.39560593925967 5.9989e-09 au q 1.674249224019885 5.9128e-08 au i 20.57050697861215 4.3428e-06 deg node 212.9327436549826 8.4873e-06 deg peri 276.6588116770135 1.1368e-05 deg M 88.55619627463322 8.7992e-06 deg tp 2458667.351431144598 (2019-Jul-02.85143114) 3.2328e-05 TDB period 1354.320644215605 3.71 5.0871e-06 1.393e-08 d yr n .2658159288478577 9.9846e-10 deg/d Q 3.116962654499454 7.8053e-09 au   Orbit Determination Parameters    # obs. used (total)      2851      data-arc span      32679 days (89.47 yr)      first obs. used      1931-05-20      last obs. used      2020-11-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38063      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:01:57   Additional Information  Earth MOID = .819901 au   Jupiter MOID = 2.35017 au   T_jup = 3.384  [ 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 11.7   n/a MPO332831   diameter diameter 11.342 km 0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 6.8090 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Hills, K. (2012) Minor Planet Bull. 39, 239-240.] [Oey, J.; Alvarez, E.M. (2012) Minor Planet Bull. 39, 147-148.] [Han, X.L.; Li, B.; Zhao, H. (2013) Minor Planet Bull. 40, 14-15.] geometric albedo albedo 0.239   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   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) 1660 Wood (1953 GA)          Discovered 1953-Apr-07 by Bruwer, J. A. at Johannesburg (UO) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1953 GA = 1931 KL = 1933 YC = 1951 RD1 = 1955 VQ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-28 16:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin