+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   118423 (1999 TJ84) Classification: Main-belt Asteroid          SPK-ID: 2118423 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1255792011473113 4.719e-08   a 3.178843544885637 2.8991e-08 au q 2.779646911946612 1.4983e-07 au i 25.37857032646218 8.0987e-06 deg node 208.8075889468395 1.0257e-05 deg peri 302.2417528552792 3.2585e-05 deg M 121.316535081199 3.1334e-05 deg tp 2458302.878825058867 (2018-Jul-03.37882506) 0.00018035 TDB period 2070.151631108764 5.67 2.832e-05 7.754e-08 d yr n .1739003049777496 2.379e-09 deg/d Q 3.578040177824663 3.2632e-08 au   Orbit Determination Parameters    # obs. used (total)      602      data-arc span      7157 days (19.59 yr)      first obs. used      1999-10-06      last obs. used      2019-05-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54332      source      ORB      producer      Otto Matic      solution date      2019-May-30 06:55:42   Additional Information  Earth MOID = 1.85454 au   Jupiter MOID = 1.58855 au   T_jup = 3.038  [ 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 14.2   n/a MPO436569   diameter diameter 7.962 km 0.196 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 24.859 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) ArXiv:1901.08719.] geometric albedo albedo 0.070   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   118423 (1999 TJ84)          Discovered 1999-Oct-13 by Spacewatch at Kitt Peak Reference: 20051116/Numbers.arc Last Updated: 2005-11-21 [ show close-approach data ] Alternate Designations  1999 TJ84 = 2002 JU25  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-30 16:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin