+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120893 (1998 SN8) Classification: Main-belt Asteroid          SPK-ID: 2120893 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1085268913667192 3.6354e-08   a 2.203922206128433 8.6646e-09 au q 1.964737380283233 8.3447e-08 au i 4.392312637629568 4.88e-06 deg node 189.0352280509274 4.6569e-05 deg peri 64.79309903723889 5.3264e-05 deg M 29.97243417351478 2.318e-05 deg tp 2459101.002462516621 (2020-Sep-08.50246252) 7.7015e-05 TDB period 1195.068551544878 3.27 7.0475e-06 1.93e-08 d yr n .3012379495173093 1.7765e-09 deg/d Q 2.443107031973634 9.605e-09 au   Orbit Determination Parameters    # obs. used (total)      493      data-arc span      9012 days (24.67 yr)      first obs. used      1995-10-18      last obs. used      2020-06-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .54787      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:38   Additional Information  Earth MOID = .953626 au   Jupiter MOID = 2.58215 au   T_jup = 3.651  [ hide covariance matrix ] Orbital Elements at Epoch 2457217.5 (2015-Jul-14.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1086701878873745 3.63e-08   q 1.963810858414435 8.3324e-08 au tp 2456711.257796148559 (2014-Feb-22.75779615) 7.9685e-05 TDB node 189.0671423974051 4.6581e-05 deg peri 64.68142731869199 5.327e-05 deg i 4.39162197495671 4.8803e-06 deg   Orbit Determination Parameters    # obs. used (total)      493      data-arc span      9012 days (24.67 yr)      first obs. used      1995-10-18      last obs. used      2020-06-20      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .54787      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:38   Additional Information  Jupiter MOID = 2.58215 au   T_jup = 3.651  Orbit Covariance (6×6)   e q tp node peri i e 1.317673377187215E-15 -3.013537265594107E-15 -2.930194263750559E-13 3.280535394622352E-15 -1.031874141153537E-13 -1.713953489666015E-15 q -3.013537265594107E-15 6.942829370777266E-15 4.691685685858326E-13 -6.982368133896316E-15 1.783783411838473E-13 4.232225810252139E-15 tp -2.930194263750559E-13 4.691685685858326E-13 6.349705751380807E-9 -4.383224625281502E-11 2.065662347496807E-9 -2.733580030511958E-12 node 3.280535394622352E-15 -6.982368133896316E-15 -4.383224625281502E-11 2.169759901043818E-9 -2.176925430551736E-9 7.848901358488317E-12 peri -1.031874141153537E-13 1.783783411838473E-13 2.065662347496807E-9 -2.176925430551736E-9 2.837730937136482E-9 -8.659016968917674E-12 i -1.713953489666015E-15 4.232225810252139E-15 -2.733580030511958E-12 7.848901358488317E-12 -8.659016968917674E-12 2.381749502912201E-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 16.83   n/a E2021B55   120893 (1998 SN8)          Discovered 1998-Sep-20 by Spacewatch at Kitt Peak Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 Alternate Designations  1998 SN8 = 1995 UR30  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-15 15:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin