+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1840456310934766 4.324e-08   a 3.118745749000555 2.0741e-08 au q 2.544754219405651 1.3921e-07 au i 2.185470990528198 5.7236e-06 deg node 206.2190015702858 0.00010964 deg peri 252.7016423602294 0.00011097 deg M 325.4932153278314 1.7044e-05 deg tp 2459193.328124145842 (2020-Dec-09.82812415) 9.6257e-05 TDB period 2011.723936379746 5.51 2.0069e-05 5.495e-08 d yr n .1789509949599984 1.7852e-09 deg/d Q 3.69273727859546 2.4559e-08 au   Orbit Determination Parameters    # obs. used (total)      718      data-arc span      7965 days (21.81 yr)      first obs. used      1999-01-09      last obs. used      2020-10-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51134      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:59:51   Additional Information  Earth MOID = 1.56268 au   Jupiter MOID = 1.49305 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 ] 2020-Dec-06 01:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin