+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1850269277037795 2.4469e-08   a 2.601884308011158 1.1552e-08 au q 2.120465648259179 6.7235e-08 au i 14.39945797647356 1.0427e-06 deg node 52.11590519340635 2.8816e-06 deg peri 315.645009903178 4.0493e-06 deg M 340.302765594932 5.7557e-06 deg tp 2459284.375119541733 (2021-Mar-10.87511954) 2.4803e-05 TDB period 1532.958506461939 4.20 1.0209e-05 2.795e-08 d yr n .2348400158794111 1.564e-09 deg/d Q 3.083302967763137 1.3689e-08 au   Orbit Determination Parameters    # obs. used (total)      2467      data-arc span      12124 days (33.19 yr)      first obs. used      1987-10-27      last obs. used      2021-01-05      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .38381      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 18:13:05   Additional Information  Earth MOID = 1.14461 au   Jupiter MOID = 2.43356 au   T_jup = 3.346  [ 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 11.97   n/a E2021B10   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. 2020-October); 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.] [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] 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 ] 2021-Apr-17 09:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin