+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101544 (1998 YS21) Classification: Main-belt Asteroid          SPK-ID: 2101544 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .137355834685079 4.3657e-08   a 3.191699670832586 2.1877e-08 au q 2.753301098481284 1.4764e-07 au i 4.762558003231184 4.1198e-06 deg node 293.9812033765845 5.6446e-05 deg peri 173.3735708944849 5.8975e-05 deg M 275.2284197593141 1.7729e-05 deg tp 2459490.932489849452 (2021-Oct-03.43248985) 0.00010456 TDB period 2082.722721984428 5.70 2.1413e-05 5.863e-08 d yr n .1728506613962469 1.7771e-09 deg/d Q 3.630098243183888 2.4881e-08 au   Orbit Determination Parameters    # obs. used (total)      676      data-arc span      8860 days (24.26 yr)      first obs. used      1996-08-15      last obs. used      2020-11-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51837      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 22:29:23   Additional Information  Earth MOID = 1.77016 au   Jupiter MOID = 1.50114 au   T_jup = 3.176  [ 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 14.6   n/a MPO493571   diameter diameter 5.913 km 0.361 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.073   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   101544 (1998 YS21)          Discovered 1998-Dec-26 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 1940-Jan-13 23:08 00:03 Jupiter 1.97795919908599 1.97795748936798 1.97796090880659 3.75125368119849 3.63530509325459 2429642.463687155 3.41946686397524 149.716845711643 25.6956332193306 64.2682361324837 2580432.81534627 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 1950-Dec-31 06:30 00:03 Jupiter 1.75715804457753 1.757156669572 1.75715941958575 2.73787104123685 2.55574949923749 2433646.770818802 2.91466635989928 152.845951432437 24.1022734827076 75.4701917928259 2140160.48268 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 1962-Jan-10 02:50 00:02 Jupiter 1.60506085954086 1.60506017069387 1.60506154838829 2.31450809578484 2.07400770873595 2437674.617777044 2.18568815344591 127.81583010524 20.4424657717122 82.0112728437618 2074513.88938992 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 1973-Feb-16 09:49 00:02 Jupiter 1.5796124730082 1.57961201812974 1.57961292788648 2.23443970400476 1.97996902819374 2441729.908711988 1.56466006555638 96.7438729661965 17.2926680347096 81.4270198101229 2461343.5837052 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 1984-Mar-29 15:01 00:01 Jupiter 1.68903013817409 1.6890295085758 1.68903076777238 2.31707052172015 2.08946086494597 2445789.125584312 1.11716417262324 75.8762552467926 15.7801742730217 75.6716771445415 2284801.7534665 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 1995-Apr-27 00:07 < 00:01 Jupiter 1.88771083049434 1.88771021768139 1.88771144330718 2.61613456768472 2.43859652536789 2449834.504717279 0.73429378639589 52.5521893912152 15.3096559653378 72.1607112151804 2555636.96825419 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 2094-Jul-30 01:10 00:02 Jupiter 1.99513914669121 1.99513814507294 1.99514014831028 3.84142991281719 3.72927574974668 2486088.548586582 2.26270249909185 92.5674108418006 23.981696842554 68.8737794562217 2698900.08544449 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 2105-Jul-14 03:49 00:03 Jupiter 1.77147752392047 1.77147638724685 1.7714786605951 2.68974998083859 2.50568666084077 2490089.658733115 2.60726108403028 113.392059542076 21.7677382405001 78.5841640053948 2033617.72379403 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 2116-Jul-18 02:21 00:03 Jupiter 1.60546784851419 1.60546700966378 1.60546868736688 2.20753827522295 1.95398389012873 2494111.597720451 2.81134186702078 173.388428111326 21.823087290162 83.3709829517428 1875203.25913696 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 2127-Aug-21 13:10 00:03 Jupiter 1.55777229433771 1.55777185156248 1.55777273711275 2.17824626361647 1.91240098943579 2498163.048370906 3.08350595842125 103.645353796332 20.558266324295 81.2108175139564 2554775.31825862 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 2138-Oct-03 02:34 00:04 Jupiter 1.65160341948039 1.65160210806495 1.65160473089855 2.33188773977846 2.1004769014497 2502223.607144459 3.6239982322048 149.74432926003 19.6545453610733 70.9296557615021 2081655.07705253 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 2149-Oct-31 10:28 00:04 Jupiter 1.85278250284751 1.85278030672509 1.85278469897329 2.67680079140308 2.50018752399242 2506269.936266636 4.30057715033985 175.077557683054 20.7482632277233 60.5348344012469 2266614.8501132 T 21 CATAB v2.0f-lin.ifort 2020-Dec-17 22:29:25 2020-Dec-17 22:29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-24 20:08 UT (server date/time)   Site Manager:   Ryan S. 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