+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   4953 (1990 MU) Classification: Apollo [NEO, PHA]          SPK-ID: 2004953 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6574048804049283 2.1808e-07   a 1.621283267672516 5.2705e-08 AU q .5554437349857544 3.547e-07 AU i 24.3912365184535 2.1446e-05 deg node 77.75967875166091 4.3302e-05 deg peri 77.71699465276376 4.4689e-05 deg M 79.75437646973435 0.00010376 deg tp 2456233.452953648730 (2012-Nov-01.95295365) 0.00020924 JED period 754.0267926146756 2.06 3.6768e-05 1.007e-07 d yr n .4774366156826578 2.3281e-08 deg/d Q 2.687122800359278 8.7354e-08 AU   Orbit Determination Parameters    # obs. used (total)      140      # delay obs. used      0      # Doppler obs. used      2      data-arc span      13554 days (37.11 yr)      first obs. used      1974-07-21      last obs. used      2011-08-30      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .67282      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:37:38   Additional Information  Earth MOID = .0267485 AU   T_jup = 3.976  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.1 mag n/a PDS3 (MPC 28112)   rotation period rot_per 14.218 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Mottola, S.; De Angelis, G.; Di Martino, M.; Erikson, A.; et al. (1995) Icarus 117, 62-70; Mottola, S.; De Angelis, G.; Di Martino, M.; Erikson, A.; Harris, A.W.; Hahn, G.; Neukum, G.; Pravec, M.; Wolf, M. (1995) Lunar & Planetary Science XXVI, 1003-1004.] 4953 (1990 MU)          Discovered 1990-Jun-23 by McNaught, R. H. at Siding Spring (413) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-25 08:46 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin