+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120409 (2178 P-L) Classification: Main-belt Asteroid          SPK-ID: 2120409 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2228339400437124 6.3453e-08   a 2.409054029315007 1.1144e-08 au q 1.872235028184563 1.5635e-07 au i 6.282399441013673 1.0086e-05 deg node 349.5805467584826 4.6306e-05 deg peri 316.1134355959531 5.1841e-05 deg M 29.69762068257495 2.0779e-05 deg tp 2458887.835422501777 (2020-Feb-08.33542250) 7.8676e-05 TDB period 1365.740654205283 3.74 9.4766e-06 2.595e-08 d yr n .2635932370406606 1.829e-09 deg/d Q 2.945873030445451 1.3627e-08 au   Orbit Determination Parameters    # obs. used (total)      319      data-arc span      21411 days (58.62 yr)      first obs. used      1960-09-24      last obs. used      2019-05-09      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59727      source      ORB      producer      Otto Matic      solution date      2019-May-30 06:57:58   Additional Information  Earth MOID = .863607 au   Jupiter MOID = 2.33681 au   T_jup = 3.479  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.6   n/a MPO469248   120409 (2178 P-L)          Discovered 1960-Sep-24 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar Reference: 20051116/Numbers.arc Last Updated: 2005-11-21 [ show close-approach data ] Alternate Designations  2178 P-L = 2000 EJ177  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-25 12:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin