+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   266687 (2009 OL21) Classification: Main-belt Asteroid          SPK-ID: 2266687 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1965123888371854 4.1415e-08   a 2.439358387898394 1.6155e-08 au q 1.959994243862455 1.0355e-07 au i 1.480413962695496 4.8698e-06 deg node 265.4180896935626 0.00020822 deg peri 71.80302622603104 0.00020871 deg M 288.9651679293216 1.4899e-05 deg tp 2459275.087460666803 (2021-Mar-01.58746067) 5.8506e-05 TDB period 1391.591743916473 3.81 1.3824e-05 3.785e-08 d yr n .2586965621014837 2.57e-09 deg/d Q 2.918722531934332 1.933e-08 au   Orbit Determination Parameters    # obs. used (total)      271      data-arc span      6422 days (17.58 yr)      first obs. used      2002-12-14      last obs. used      2020-07-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53007      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 22:24:03   Additional Information  Earth MOID = .951277 au   Jupiter MOID = 2.46698 au   T_jup = 3.475  [ hide covariance matrix ] Orbital Elements at Epoch 2457430.5 (2016-Feb-12.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1957105639012405 4.1453e-08   q 1.962364938170044 1.0351e-07 au tp 2457884.139064069266 (2017-May-10.63906407) 5.5391e-05 TDB node 265.4404422089409 0.00020833 deg peri 71.87981230960119 0.00020882 deg i 1.479662463543453 4.8686e-06 deg   Orbit Determination Parameters    # obs. used (total)      271      data-arc span      6422 days (17.58 yr)      first obs. used      2002-12-14      last obs. used      2020-07-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53007      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 22:24:03   Additional Information  Jupiter MOID = 2.46698 au   T_jup = 3.475  Orbit Covariance (6×6)   e q tp node peri i e 1.718349640936925E-15 -4.256928888567521E-15 1.074362855918134E-12 6.11898193901531E-15 2.981292700908309E-13 -1.026053852629765E-15 q -4.256928888567521E-15 1.071438056472249E-14 -2.532575910597061E-12 -2.157498804084163E-14 -7.147459601908576E-13 2.700974415194828E-15 tp 1.074362855918134E-12 -2.532575910597061E-12 3.06818343086551E-9 1.334270952418967E-11 8.255798890959514E-10 -1.468337895235295E-12 node 6.11898193901531E-15 -2.157498804084163E-14 1.334270952418967E-11 4.340051211760681E-8 -4.338218308329383E-8 -4.458871719635227E-10 peri 2.981292700908309E-13 -7.147459601908576E-13 8.255798890959514E-10 -4.338218308329383E-8 4.36061273851679E-8 4.453410841282263E-10 i -1.026053852629765E-15 2.700974415194828E-15 -1.468337895235295E-12 -4.458871719635227E-10 4.453410841282263E-10 2.370301394084231E-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 17.0   n/a MPO433731   266687 (2009 OL21)          Discovered 2009-Jul-26 by La Sagra at La Sagra Reference: 20110218/Numbers.arc Last Updated: 2011-02-22 Alternate Designations  2009 OL21 = 2008 FM122  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-20 21:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin