+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187821 (1999 TS260) Classification: Outer Main-belt Asteroid          SPK-ID: 2187821 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1182199726900563 4.3833e-08   a 3.200227676466256 3.0154e-08 au q 2.821896847952452 1.3061e-07 au i 5.270022263127485 5.7594e-06 deg node 233.2293499599576 5.3813e-05 deg peri 240.3803344326119 6.0454e-05 deg M 187.9691146776583 2.6399e-05 deg tp 2460199.748869624738 (2023-Sep-12.24886962) 0.0001556 TDB period 2091.075636743163 5.73 2.9555e-05 8.092e-08 d yr n .1721602000780315 2.4333e-09 deg/d Q 3.578558504980059 3.3719e-08 au   Orbit Determination Parameters    # obs. used (total)      356      data-arc span      7202 days (19.72 yr)      first obs. used      1999-10-11      last obs. used      2019-06-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54752      source      ORB      producer      Otto Matic      solution date      2020-Feb-24 20:42:11   Additional Information  Earth MOID = 1.84311 au   Jupiter MOID = 1.57982 au   T_jup = 3.177  [ 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 15.3   n/a MPO436929   diameter diameter 6.089 km 0.104 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.036   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   187821 (1999 TS260)          Discovered 1999-Oct-11 by Spacewatch at Kitt Peak Reference: 20080618/Numbers.arc Last Updated: 2008-06-20 [ show close-approach data ] Alternate Designations  1999 TS260 = 2005 UG154  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-12 04:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin