+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   249623 (1999 TP46) Classification: Main-belt Asteroid          SPK-ID: 2249623 [ 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 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06078682081392446 5.7417e-08   a 3.138869493384755 4.9224e-08 au q 2.948067595932081 1.9968e-07 au i 15.93765679284842 8.8924e-06 deg node 19.60256609433447 2.2475e-05 deg peri 268.0927751971455 9.5305e-05 deg M 334.9972317066654 9.9293e-05 deg tp 2459141.573002944340 (2020-Oct-19.07300294) 0.00056213 TDB period 2031.226321187054 5.56 4.7781e-05 1.308e-07 d yr n .1772328352803222 4.1691e-09 deg/d Q 3.329671390837427 5.2217e-08 au   Orbit Determination Parameters    # obs. used (total)      172      data-arc span      7149 days (19.57 yr)      first obs. used      1999-10-04      last obs. used      2019-05-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57168      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 13:33:23   Additional Information  Earth MOID = 1.99014 au   Jupiter MOID = 1.81717 au   T_jup = 3.149  [ 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 15.4   n/a MPO396803   diameter diameter 3.940 km 1.819 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.086   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   249623 (1999 TP46)          Discovered 1999-Oct-04 by Spacewatch at Kitt Peak Reference: 20100923/Numbers.arc Last Updated: 2010-09-27 [ show close-approach data ] Alternate Designations  1999 TP46 = 2008 EB162  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-05 11:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin