+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17891 Buraliforti (1999 EA) Classification: Main-belt Asteroid          SPK-ID: 2017891 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2560615011827104 6.1857e-08   a 2.551155920815116 1.1436e-08 au q 1.897903105980038 1.612e-07 au i 11.88987283480849 7.1222e-06 deg node 352.2118493132783 2.4678e-05 deg peri 287.6846529050905 2.7272e-05 deg M 350.0605466658027 1.2993e-05 deg tp 2459041.592629162104 (2020-Jul-11.09262916) 5.377e-05 TDB period 1488.34608916168 4.07 1.0008e-05 2.74e-08 d yr n .2418792259552831 1.6264e-09 deg/d Q 3.204408735650194 1.4365e-08 au   Orbit Determination Parameters    # obs. used (total)      1095      data-arc span      10843 days (29.69 yr)      first obs. used      1991-03-11      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54167      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:06:35   Additional Information  Earth MOID = .921963 au   Jupiter MOID = 2.12679 au   T_jup = 3.364  [ 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 14.7   n/a MPO337410   diameter diameter 3.897 km 1.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.140   0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17891 Buraliforti           Discovered 1999 Mar. 6 by P. G. Comba at Prescott. Cesare Burali-Forti (1861-1931) taught at the Military Academy in Turin. He discovered a paradox in Cantor's set theory: since the ordinal number of a set of ordinals is greater than the ordinal of each set element, "the ordinal of the set of all ordinals" is a self-contradictory concept. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010109/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1999 EA = 1991 ER3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-28 06:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin