+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120906 (1998 SL39) Classification: Main-belt Asteroid          SPK-ID: 2120906 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1080327874535582 4.8891e-08   a 3.057212337317457 2.3951e-08 au q 2.726933166679645 1.5665e-07 au i 1.388668375526175 5.4492e-06 deg node 168.6052862590544 0.00017214 deg peri 339.7599719247822 0.00017369 deg M 269.1915570976414 2.5101e-05 deg tp 2459693.004905117702 (2022-Apr-23.50490512) 0.00013907 TDB period 1952.481070873725 5.35 2.2944e-05 6.282e-08 d yr n .1843807888180457 2.1667e-09 deg/d Q 3.38749150795527 2.6538e-08 au   Orbit Determination Parameters    # obs. used (total)      496      data-arc span      8121 days (22.23 yr)      first obs. used      1998-09-13      last obs. used      2020-12-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .52499      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:43   Additional Information  Earth MOID = 1.73824 au   Jupiter MOID = 1.61219 au   T_jup = 3.226  [ 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 15.6   n/a MPO453679   120906 (1998 SL39)          Discovered 1998-Sep-23 by Spacewatch at Kitt Peak Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ 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-22 09:58 00:03 Jupiter 1.72161496509725 1.72161372403047 1.72161620616609 2.36703575643279 2.1491561768955 2429650.915065368 3.02184673534803 142.358104540618 5.91916584961358 84.8460243751294 1686274.89121417 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 1949-Jul-17 11:42 00:03 Jupiter 1.81148361554257 1.81148232721884 1.81148490386578 2.33466310639579 2.12496632475865 2433114.987706801 2.58993709401098 70.2478412501141 14.3329816442722 -75.4440216417068 1340039.80294973 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 1998-Jul-12 09:15 < 00:01 Jupiter 1.63199825995011 1.63199776715479 1.63199875274506 1.89463786954927 1.5973834125656 2451006.885761554 0.749329511048581 75.4073550103578 28.9769004965887 84.1374936352896 1850486.48140512 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 2047-Jul-05 11:08 00:01 Jupiter 1.85175357044003 1.85175302798613 1.85175411289394 2.9545755224499 2.79547556846138 2468896.963654536 1.15392668424155 54.3070984708233 13.8600003485539 81.3147534328358 2497952.70099864 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 2056-Dec-29 09:34 00:02 Jupiter 1.69516732908411 1.69516677393208 1.69516788423634 1.99001234067793 1.72070078125516 2472361.898757036 1.58752607569455 82.0383179172217 16.2204136257897 -85.1481170179707 2290701.31790503 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 2105-Dec-24 21:58 00:03 Jupiter 1.67828726973827 1.67828634885384 1.67828819062528 2.16129679701588 1.91358685668702 2490253.415196627 3.46048632314939 165.855840164081 12.5609750115659 -87.1702673954449 1673155.83700673 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 2115-Jun-20 21:15 00:04 Jupiter 1.88153292146463 1.88153116669346 1.88153467623493 2.59627443507829 2.41666863640445 2493718.385451202 3.7626787851797 73.639788211119 33.9287353340129 -53.3353991169133 1115727.84520584 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 2164-Jun-12 04:26 00:06 Jupiter 1.63197754169387 1.63197691606981 1.63197816732619 1.86704148674475 1.56454844776188 2511607.684930227 5.73106073878468 301.752217061667 33.5041669387904 -85.0645450742745 1912577.60845419 T 22 CATAB v2.0f-lin.ifort 2021-Apr-13 17:08:44 2021-Apr-13 17:08 Alternate Designations  1998 SL39 = 2004 TU54  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 21:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin