+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   964 Subamara (A921 UL) Classification: Main-belt Asteroid          SPK-ID: 2000964 [ 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 .1201918365189229 3.9372e-08   a 3.047920820385502 1.2663e-08 au q 2.681585619419107 1.191e-07 au i 9.050596885628975 4.4477e-06 deg node 30.68147001057527 2.0646e-05 deg peri 9.634970769181455 2.5237e-05 deg M 169.1728230228694 1.5542e-05 deg tp 2458087.160913926961 (2017-Nov-29.66091393) 8.1618e-05 TDB period 1943.586830976068 5.32 1.2112e-05 3.316e-08 d yr n .1852245519790892 1.1543e-09 deg/d Q 3.414256021351898 1.4185e-08 au   Orbit Determination Parameters    # obs. used (total)      2769      data-arc span      41872 days (114.64 yr)      first obs. used      1905-10-26      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42827      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:23:56   Additional Information  Earth MOID = 1.68983 au   Jupiter MOID = 2.02017 au   T_jup = 3.208  [ 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 10.8   n/a MPO473775   diameter diameter 19.835 km 0.536 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 6.868 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Folberth, J.; Casimir, S.; Dou, Y.; Evans, D; et al. (2012) Minor Planet Bull. 39, 51-55.] [Alkema, M.S. (2013) Minor Planet Bull. 40, 133-137.] [Polakis, T. (2018) Minor Planet Bull. 45, 199-203.] geometric albedo albedo 0.236   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   964 Subamara (A921 UL)          Discovered 1921-Oct-27 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A921 UL = A905 UL  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-06 10:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin