+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21880 (1999 UF14) Classification: Main-belt Asteroid          SPK-ID: 2021880 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1090142726275355 2.4215e-08   a 2.549007348742154 9.3454e-09 au q 2.271129166696785 6.0733e-08 au i 4.259005482008361 4.6581e-06 deg node 163.7924356518706 4.729e-05 deg peri 116.9406492789473 5.4963e-05 deg M 218.8917906054111 2.6967e-05 deg tp 2459979.146092587913 (2023-Feb-03.64609259) 0.00011158 TDB period 1486.466267494796 4.07 8.1747e-06 2.238e-08 d yr n .242185112351539 1.3319e-09 deg/d Q 2.826885530787523 1.0364e-08 au   Orbit Determination Parameters    # obs. used (total)      1868      data-arc span      8801 days (24.10 yr)      first obs. used      1997-03-02      last obs. used      2021-04-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49102      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 18:37:23   Additional Information  Earth MOID = 1.2584 au   Jupiter MOID = 2.28803 au   T_jup = 3.429  [ 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 14.2   n/a MPO347691   diameter diameter 3.949 km 0.192 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.312   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21880 (1999 UF14)          Discovered 1999-Oct-29 by CSS at Catalina Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 UF14 = 1998 MA20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-01 05:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin