+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   528381 (2008 ST291) Classification: TransNeptunian Object          SPK-ID: 2528381 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .578356408732191 7.0901e-05   a 100.56714973338 0.014866 au q 42.40349417714981 0.0033315 au i 20.73515253126741 0.00013491 deg node 330.9035979264175 0.00035006 deg peri 325.0698616989908 0.0060722 deg M 23.42307308178053 0.006053 deg tp 2435032.929589830372 (1954-Oct-17.42958983) 0.88684 TDB period 368368.630261951 1008.54 81.678 0.2236 d yr n .0009772819138915278 2.1669e-07 deg/d Q 158.7308052896101 0.023463 au   Orbit Determination Parameters    # obs. used (total)      93      data-arc span      4346 days (11.90 yr)      first obs. used      2008-09-24      last obs. used      2020-08-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .50709      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 22:13:20   Additional Information  Earth MOID = 41.4092 au   Jupiter MOID = 37.3804 au   T_jup = 6.760  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 4.4   n/a E2018X68   528381 (2008 ST291)          Discovered 2008-Sep-24 by Schwamb, M. E., Brown, M. E., Rabinowitz, D. L. at Palomar Reference: Last Updated: 2019-05-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2020-Dec-04 03:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin