+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   6489 Golevka (1991 JX) Classification: Apollo [NEO, PHA]          SPK-ID: 2006489 [ 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 93 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6092592541017792 2.5237e-09   a 2.495105335124645 2.7193e-10 AU q .9749393197412339 6.2182e-09 AU i 2.27101444322923 9.7044e-07 deg node 210.5807079254073 2.7678e-05 deg peri 67.22235527404987 2.7901e-05 deg M 176.4465816593605 4.5943e-07 deg tp 2455694.926108006038 (2011-May-13.42610801) 1.7246e-06 JED period 1439.566574365262 3.94 2.3534e-07 6.443e-10 d yr n .2500752701615986 4.0882e-11 deg/d Q 4.015271350508056 4.3761e-10 AU   Orbit Determination Parameters    # obs. used (total)      836      # delay obs. used      14      # Doppler obs. used      20      data-arc span      3149 days (8.62 yr)      first obs. used      1995-03-07      last obs. used      2003-10-20      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .7445      data source      ORB      producer      Otto Matic      solution date      2005-Mar-22 11:21:31   Additional Information  Earth MOID = .0261152 AU   T_jup = 3.183  [ 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 19.2 mag n/a PDS3 (MPC 28115)   diameter diameter 0.53 km 0.03 Hudson et al., Icarus 148, 2000.   bulk density density 2.7 g/cm^3 +.4-.6 Chesley et al. 2003, Science 302, 1739-1742. Porosity 19% rotation period rot_per 6.026 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Mottola, S.; et al. (1997) Astron. J. 114, 1234-1245.] [Hudson, R.S.; et al. (2000) Icarus 148, 37-51.] [Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.] geometric albedo albedo 0.151   0.023 Hudson et al., Icarus 148, 2000.   SMASSII spectral type spec_B Q   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) 6489 Golevka (1991 JX)          Discovered 1991-May-10 by Helin, E. F. at Palomar (675) 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-20 05:20 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin