+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18868 (1999 TD101) Classification: Outer Main-belt Asteroid          SPK-ID: 2018868 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03588241502865351 3.7183e-08   a 3.213349523123326 1.8048e-08 au q 3.098046781902489 1.2216e-07 au i 12.74164366814005 3.1581e-06 deg node 116.0927587600962 1.8665e-05 deg peri 295.3634336467313 5.6998e-05 deg M 217.8048173337979 5.6414e-05 deg tp 2460031.532025483855 (2023-Mar-28.03202548) 0.00033399 TDB period 2103.94982139783 5.76 1.7726e-05 4.853e-08 d yr n .1711067423465555 1.4416e-09 deg/d Q 3.328652264344163 1.8696e-08 au   Orbit Determination Parameters    # obs. used (total)      2100      data-arc span      15136 days (41.44 yr)      first obs. used      1979-03-22      last obs. used      2020-08-29      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44614      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:40:21   Additional Information  Earth MOID = 2.13562 au   Jupiter MOID = 1.85616 au   T_jup = 3.151  [ 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 12.7   n/a MPO474015   diameter diameter 8.874 km 0.152 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.224   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18868 (1999 TD101)          Discovered 1999-Oct-02 by LINEAR at Socorro Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 TD101 = 1979 FA4 = 1984 BS2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 16:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin