+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21329 (1997 AP15) Classification: Main-belt Asteroid          SPK-ID: 2021329 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1777713146492914 3.3075e-08   a 2.380702323736093 8.5123e-09 au q 1.957481741856905 7.6792e-08 au i 7.240235495673027 4.0225e-06 deg node 318.1633671881462 2.8683e-05 deg peri 271.5925641428785 3.092e-05 deg M 90.73414496169451 1.1471e-05 deg tp 2458862.338375717267 (2020-Jan-13.83837572) 4.2311e-05 TDB period 1341.702010783025 3.67 7.1959e-06 1.97e-08 d yr n .2683159130020994 1.4391e-09 deg/d Q 2.803922905615281 1.0026e-08 au   Orbit Determination Parameters    # obs. used (total)      1413      data-arc span      15225 days (41.68 yr)      first obs. used      1979-03-29      last obs. used      2020-12-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50725      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:52:03   Additional Information  Earth MOID = .962387 au   Jupiter MOID = 2.24886 au   T_jup = 3.506  [ 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 14.91   n/a E2021B10   diameter diameter 3.622 km 0.975 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   geometric albedo albedo 0.133   0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   21329 (1997 AP15)          Discovered 1997-Jan-12 by JPL/GEODSS NEAT at Haleakala Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1997 AP15 = 1979 FA1 = 1990 EB2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 13:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin