+ 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 2452464.5 (2002-Jul-09.0) TDB Reference: JPL 105 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6052965473603549 2.478e-09   a 2.502473955538531 4.5222e-10 au q .987735110391848 6.0535e-09 au i 2.276480760253867 6.4443e-07 deg node 211.0620214995175 2.1622e-05 deg peri 66.65547373733823 2.2559e-05 deg M 274.4136345211533 2.1038e-07 deg tp 2452808.259619100164 (2003-Jun-17.75961910) 9.3587e-07 TDB period 1445.948337491274 3.96 3.9195e-07 1.073e-09 d yr n .2489715508263604 6.7488e-11 deg/d Q 4.017212800685214 7.2595e-10 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -1.151280007401779E-14 1.456E-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.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61351      source      ORB      producer      Otto Matic      solution date      2019-Jan-14 15:16:27   Additional Information  Earth MOID = .0280499 au   Jupiter MOID = 1.14488 au   T_jup = 3.182   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-Jan-17 20:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin