+ 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 ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1832275804852908 3.4877e-08   a 2.417292489650709 8.7157e-09 au q 1.974377835446745 8.5084e-08 au i 3.303631957309437 3.7008e-06 deg node 101.6186876607827 6.8049e-05 deg peri 197.789499764585 6.8972e-05 deg M 4.229365377409762 1.3438e-05 deg tp 2459380.372578527015 (2021-Jun-14.87257853) 5.1206e-05 TDB period 1372.752460992232 3.76 7.4243e-06 2.033e-08 d yr n .2622468436441849 1.4183e-09 deg/d Q 2.860207143854673 1.0313e-08 au   Orbit Determination Parameters    # obs. used (total)      1500      data-arc span      8905 days (24.38 yr)      first obs. used      1997-02-04      last obs. used      2021-06-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51063      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 05:11:42   Additional Information  Earth MOID = .958519 au   Jupiter MOID = 2.35175 au   T_jup = 3.490  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.86   n/a MPO614063   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 Alternate Designations  1999 TX72 = 1998 KH20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-01 05:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin