+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 10 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5789577267350223 7.094e-05   a 100.8724924592254 0.014955 au q 42.47158353493658 0.0033307 au i 20.72800599272913 0.00013473 deg node 330.8820618980277 0.0003499 deg peri 325.296576041467 0.006077 deg M 23.47330343374546 0.0060712 deg tp 2435072.058727597836 (1954-Nov-25.55872760) 0.88152 TDB period 370047.5684039151 1013.14 82.291 0.2253 d yr n .0009728479004814106 2.1634e-07 deg/d Q 159.2734013835142 0.023613 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.      DE441      SB-pert. ephem.      SB441-N16      condition code      2      norm. resid. RMS      .50709      source      ORB      producer      Otto Matic      solution date      2021-Apr-14 19:39:27   Additional Information  Earth MOID = 41.4751 au   Jupiter MOID = 37.4478 au   T_jup = 6.767  [ 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 ] 2021-Apr-22 15:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin