+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1258005928541084 4.5881e-08   a 3.178623138860941 2.8695e-08 au q 2.778750463532448 1.4577e-07 au i 25.37840031205304 7.9367e-06 deg node 208.6987565659378 9.6038e-06 deg peri 302.4038664130783 3.157e-05 deg M 156.0049074462191 3.0426e-05 deg tp 2458303.499372081438 (2018-Jul-03.99937208) 0.00017564 TDB period 2069.936333009302 5.67 2.803e-05 7.674e-08 d yr n .1739183926863234 2.3551e-09 deg/d Q 3.578495814189435 3.2305e-08 au   Orbit Determination Parameters    # obs. used (total)      735      data-arc span      7671 days (21.00 yr)      first obs. used      1999-10-06      last obs. used      2020-10-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50568      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 18:11:40   Additional Information  Earth MOID = 1.85291 au   Jupiter MOID = 1.58632 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 14.27   n/a E2021B55   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. 2020-October); 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) Ap. J. Supp. Ser. 241, A6.] 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 ] 2021-Apr-11 04:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin