+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   4205 David Hughes (1985 YP) Classification: Mars-crossing Asteroid          SPK-ID: 2004205 [ 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 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1493705264121798 7.4802e-08   a 1.726618714643622 6.4184e-09 AU q 1.468712768324183 1.2952e-07 AU i 16.48047070786232 8.903e-06 deg node 276.5757895458198 2.5621e-05 deg peri 110.0044948088563 4.3342e-05 deg M 70.44223005921471 3.091e-05 deg tp 2456238.347485258249 (2012-Nov-06.84748526) 7.1196e-05 JED period 828.6918977147621 2.27 4.6208e-06 1.265e-08 d yr n .4344195967074761 2.4223e-09 deg/d Q 1.984524660963061 7.3771e-09 AU   Orbit Determination Parameters    # obs. used (total)      650      data-arc span      11967 days (32.76 yr)      first obs. used      1980-06-06      last obs. used      2013-03-12      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .48542      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:02:00   Additional Information  Earth MOID = .553076 AU   T_jup = 4.106  [ 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 14.7 mag n/a PDS3 (MPC 17271)   rotation period rot_per 24. h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) lower-limit; Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] SMASSII spectral type spec_B Xe   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 4205 David Hughes (1985 YP)          Discovered 1985-Dec-18 by Bowell, E. at Flagstaff Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1985 YP = 1986 AF = 1986 CF  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-Jun-19 16:25 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin