+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120915 (1998 SX81) Classification: Main-belt Asteroid          SPK-ID: 2120915 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .1072790592457038 4.0226e-08   a 2.158433562333439 8.6976e-09 au q 1.926878840321955 9.1485e-08 au i 1.695477418526092 4.0085e-06 deg node 213.5284573005374 0.0001052 deg peri 204.4878931045102 0.00010718 deg M 317.3136784950858 2.2138e-05 deg tp 2459337.838621913810 (2021-May-03.33862191) 7.172e-05 TDB period 1158.261057544617 3.17 7.001e-06 1.917e-08 d yr n .3108107603679255 1.8787e-09 deg/d Q 2.389988284344924 9.6307e-09 au   Orbit Determination Parameters    # obs. used (total)      629      data-arc span      8110 days (22.20 yr)      first obs. used      1998-09-26      last obs. used      2020-12-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55014      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:43   Additional Information  Earth MOID = .938295 au   Jupiter MOID = 2.87172 au   T_jup = 3.691  [ hide covariance matrix ] Orbital Elements at Epoch 2457609.5 (2016-Aug-09.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1082165525448182 4.0355e-08   q 1.924790458876656 9.1841e-08 au tp 2458178.663341794627 (2018-Mar-01.16334179) 6.6854e-05 TDB node 213.5978575628447 0.00010513 deg peri 204.2541860886073 0.00010707 deg i 1.695966995496214 4.0099e-06 deg   Orbit Determination Parameters    # obs. used (total)      629      data-arc span      8110 days (22.20 yr)      first obs. used      1998-09-26      last obs. used      2020-12-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55014      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:43   Additional Information  Jupiter MOID = 2.87172 au   T_jup = 3.691  Orbit Covariance (6×6)   e q tp node peri i e 1.628523985958415E-15 -3.69738603924686E-15 -1.416775232523978E-12 8.239314447687104E-15 -3.752117458470735E-13 -1.537241913542581E-15 q -3.69738603924686E-15 8.434756031919985E-15 3.334022353347376E-12 -1.826183947683973E-14 8.827326493518053E-13 3.583258106636096E-15 tp -1.416775232523978E-12 3.334022353347376E-12 4.469497189204087E-9 2.06875848271735E-12 1.358384740773409E-9 2.817802715876258E-12 node 8.239314447687104E-15 -1.826183947683973E-14 2.06875848271735E-12 1.105166695260933E-8 -1.104532877641549E-8 -1.226258154656267E-10 peri -3.752117458470735E-13 8.827326493518053E-13 1.358384740773409E-9 -1.104532877641549E-8 1.146368396052608E-8 1.233862953287907E-10 i -1.537241913542581E-15 3.583258106636096E-15 2.817802715876258E-12 -1.226258154656267E-10 1.233862953287907E-10 1.607939365012917E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 17.04   n/a E2021B55   rotation period rot_per 7.32 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 [Result based on fragmentary lightcurve(s), may be completely wrong.] 120915 (1998 SX81)          Discovered 1998-Sep-26 by LINEAR at Socorro Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 Alternate Designations  1998 SX81 = 2000 FG67  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-19 07:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin