+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21823 (1999 TX72) Classification: Main-belt Asteroid          SPK-ID: 2021823 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1829469247232504 3.5033e-08   a 2.416433885821274 1.1821e-08 au q 1.974354737613218 8.5168e-08 au i 3.303888530279641 3.7128e-06 deg node 101.6186118724616 7.206e-05 deg peri 197.8312912742931 7.3598e-05 deg M 312.7732246209815 2.0004e-05 deg tp 2459380.489261539654 (2021-Jun-14.98926154) 7.7179e-05 TDB period 1372.021139157903 3.76 1.0067e-05 2.756e-08 d yr n .2623866278189818 1.9253e-09 deg/d Q 2.85851303402933 1.3983e-08 au   Orbit Determination Parameters    # obs. used (total)      1383      data-arc span      8507 days (23.29 yr)      first obs. used      1997-02-04      last obs. used      2020-05-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52126      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:54:47   Additional Information  Earth MOID = .956981 au   Jupiter MOID = 2.35448 au   T_jup = 3.491  [ 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 14.86   n/a E2021B10   diameter diameter 2.798 km 0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.326   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21823 (1999 TX72)          Discovered 1999-Oct-09 by Spacewatch at Kitt Peak Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 TX72 = 1998 KH20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 12:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin