+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101509 (1998 XN20) Classification: Main-belt Asteroid          SPK-ID: 2101509 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1237344489314411 4.8163e-08   a 2.738320566549253 1.8343e-08 au q 2.399495980249649 1.3494e-07 au i 6.660389872915155 4.7676e-06 deg node 279.9302786567413 4.417e-05 deg peri 258.9647614534333 4.9122e-05 deg M 293.3062056822316 2.6021e-05 deg tp 2459703.125157524661 (2022-May-03.62515752) 0.0001212 TDB period 1655.102365040723 4.53 1.6631e-05 4.553e-08 d yr n .2175092052334433 2.1856e-09 deg/d Q 3.077145152848856 2.0613e-08 au   Orbit Determination Parameters    # obs. used (total)      319      data-arc span      8068 days (22.09 yr)      first obs. used      1998-12-10      last obs. used      2021-01-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56953      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:37:06   Additional Information  Earth MOID = 1.41507 au   Jupiter MOID = 1.95559 au   T_jup = 3.330  [ 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 15.95   n/a MPCxxxxx   diameter diameter 3.729 km 0.951 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.055   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   101509 (1998 XN20)          Discovered 1998-Dec-10 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1915-Nov-07 16:27 00:03 Jupiter 1.95464543197286 1.95464497732111 1.95464588662473 2.26238972530176 2.06197257296524 2420809.185750413 3.06561588615598 230.805277380372 17.202267051094 86.3228787813591 2438337.4182378 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 15:37:08 2021-Apr-13 15:37 2011-Apr-03 05:44 < 00:01 Jupiter 1.96508705869862 1.96508659700885 1.96508752038838 2.29949265178837 2.10370987147312 2455654.738731356 0.244160945520692 45.1528807768825 11.4177038680735 -77.7837533669526 2434093.34809963 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 15:37:08 2021-Apr-13 15:37 2069-Oct-22 02:18 00:02 Jupiter 1.96410863314069 1.96410814902647 1.9641091172558 2.36515352331165 2.1751897649696 2477041.595804639 1.61218999840418 144.422068337464 15.9909496002925 88.4382047602465 2536591.10307731 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 15:37:08 2021-Apr-13 15:37 2165-Mar-18 19:32 00:05 Jupiter 1.95706515443171 1.95706469441373 1.95706561444957 2.22166317724803 2.01746932008095 2511887.314181219 4.5226650171038 238.707730669778 13.3447790984481 -87.8518698867301 2351933.53785208 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 15:37:08 2021-Apr-13 15:37 Alternate Designations  1998 XN20 = 2004 FC14  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jul-31 13:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin