+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101559 (1999 AJ9) Classification: Main-belt Asteroid          SPK-ID: 2101559 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1842224232405328 4.0341e-08   a 3.119560728288822 1.5815e-08 au q 2.544867691477454 1.2601e-07 au i 2.185242071194948 4.463e-06 deg node 206.2129090218937 0.00010737 deg peri 252.6631629808239 0.00010837 deg M 1.314064189632078 1.2443e-05 deg tp 2459193.153970416419 (2020-Dec-09.65397042) 6.9549e-05 TDB period 2012.512532458298 5.51 1.5304e-05 4.19e-08 d yr n .17888087363126 1.3603e-09 deg/d Q 3.694253765100189 1.8728e-08 au   Orbit Determination Parameters    # obs. used (total)      870      data-arc span      8090 days (22.15 yr)      first obs. used      1999-01-09      last obs. used      2021-03-04      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4832      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:37:23   Additional Information  Earth MOID = 1.5626 au   Jupiter MOID = 1.49178 au   T_jup = 3.189  [ 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 14.9   n/a MPO412743   diameter diameter 5.374 km 0.188 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.067   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   101559 (1999 AJ9)          Discovered 1999-Jan-09 by Beijing Schmidt CCD Asteroid Program at Xinglong Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 AJ9 = 2002 QN22  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 14:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin