+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   6000 United Nations (1987 UN) Classification: Main-belt Asteroid          SPK-ID: 2006000 [ 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 .1854545242108545 3.7713e-08   a 2.602893068493886 1.2309e-08 au q 2.120174772904622 1.02e-07 au i 14.40211343020245 3.9379e-06 deg node 52.14807252400186 1.5992e-05 deg peri 315.5958311162367 1.924e-05 deg M 293.3991375509446 1.2773e-05 deg tp 2459284.265941960488 (2021-Mar-10.76594196) 5.5377e-05 TDB period 1533.850093666834 4.20 1.088e-05 2.979e-08 d yr n .2347035094801091 1.6648e-09 deg/d Q 3.085611364083151 1.4592e-08 au   Orbit Determination Parameters    # obs. used (total)      2281      data-arc span      11972 days (32.78 yr)      first obs. used      1987-10-27      last obs. used      2020-08-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39476      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 23:34:56   Additional Information  Earth MOID = 1.14571 au   Jupiter MOID = 2.4304 au   T_jup = 3.345  [ 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 11.9   n/a MPO337304   diameter diameter 11.000 km 0.295 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 3.262 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Bennefeld, C. (2011) http://www.bennefeld.org/astronomy/] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.211   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   6000 United Nations (1987 UN)          Discovered 1987-Oct-27 by Jensen, P. at Brorfelde Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1987 UN = 1991 TC1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 18:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin