+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102269 (1999 TH44) Classification: Main-belt Asteroid          SPK-ID: 2102269 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08877154194952144 4.7018e-08   a 2.416685138574931 9.9008e-09 au q 2.202152272417142 1.0946e-07 au i 2.388761481219624 3.7574e-06 deg node 309.1317404063665 0.00012505 deg peri 201.3737681317903 0.00012782 deg M 111.2414977717237 2.6284e-05 deg tp 2458776.473635056728 (2019-Oct-19.97363506) 9.9707e-05 TDB period 1372.235132008259 3.76 8.4328e-06 2.309e-08 d yr n .2623457100046271 1.6122e-09 deg/d Q 2.631218004732721 1.078e-08 au   Orbit Determination Parameters    # obs. used (total)      716      data-arc span      7569 days (20.72 yr)      first obs. used      1999-10-03      last obs. used      2020-06-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55934      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:41:12   Additional Information  Earth MOID = 1.21306 au   Jupiter MOID = 2.36109 au   T_jup = 3.510  [ 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 16.01   n/a E2021B55   diameter diameter 3.739 km 0.358 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.060   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   102269 (1999 TH44)          Discovered 1999-Oct-03 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2174-Oct-27 12:29 00:02 Thisb 0.0241759211122499 0.0241592818814036 0.0241925860482537 4.56942880837027 4.56942874664972 2515397.019919627 2.12514243677403 1497.15275195742 60.9873598808996 56.3997828029976 49389.0786483981 T 18 CATAB v2.0f-lin.ifort 2021-Apr-13 15:41:14 2021-Apr-13 15:41 Alternate Designations  1999 TH44 = 1999 TT164  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 22:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin