+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21872 (1999 UP3) Classification: Main-belt Asteroid          SPK-ID: 2021872 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1412751348461317 4.5241e-08   a 2.71252188401483 1.362e-08 au q 2.329309989077552 1.2273e-07 au i 4.806681419499228 5.2622e-06 deg node 52.73534927174205 5.325e-05 deg peri 4.250432314002814 5.5867e-05 deg M 260.7040654387854 1.9082e-05 deg tp 2459650.577466100693 (2022-Mar-12.07746610) 8.8413e-05 TDB period 1631.767589602186 4.47 1.229e-05 3.365e-08 d yr n .2206196533709592 1.6617e-09 deg/d Q 3.095733778952108 1.5545e-08 au   Orbit Determination Parameters    # obs. used (total)      1198      data-arc span      17090 days (46.79 yr)      first obs. used      1972-10-09      last obs. used      2019-07-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4964      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:54:27   Additional Information  Earth MOID = 1.34054 au   Jupiter MOID = 2.24351 au   T_jup = 3.343  [ 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 14.2   n/a MPO474053   diameter diameter 4.603 km 0.252 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.209   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21872 (1999 UP3)          Discovered 1999-Oct-18 by Beijing Schmidt CCD Asteroid Program at Xinglong Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 UP3 = 1972 TN10 = 1990 VU11  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-22 11:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin