+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   6489 Golevka (1991 JX) Classification: Apollo [NEO, PHA]          SPK-ID: 2006489 [ 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 106 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6128395545967215 2.4161e-09   a 2.485242462229812 1.7146e-09 au q .9621875786120346 5.5415e-09 au i 2.26594021238454 6.1952e-07 deg node 209.5399089111425 2.1804e-05 deg peri 68.60383321230876 2.2697e-05 deg M 159.9757015836967 1.1973e-06 deg tp 2458564.579101712152 (2019-Mar-22.07910171) 4.1031e-06 TDB period 1431.039346083768 3.92 1.4809e-06 4.054e-09 d yr n .2515654101232007 2.6034e-10 deg/d Q 4.008297345847589 2.7654e-09 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -1.216748809307156E-14 1.45E-15 ALN [SET] 1. n/a NK [SET] 0. n/a NM [SET] 2. n/a R0 [SET] 1. n/a   Orbit Determination Parameters    # obs. used (total)      1017      # delay obs. used      20      # Doppler obs. used      20      data-arc span      8968 days (24.55 yr)      first obs. used      1991-04-15      last obs. used      2015-11-03      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .629      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 18:48:39   Additional Information  Earth MOID = .0245718 au   Jupiter MOID = 1.17059 au   T_jup = 3.185   Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2  [ 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 19.2   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 LCDB (Rev. 2020-October); Warner et al., 2009 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 Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jun-23 11:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin