+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   231P/LINEAR-NEAT Classification: Jupiter-family Comet          SPK-ID: 1000427 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456063.5 (2012-May-16.0) TDB Reference: JPL 52 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .246816248172099 2.6324e-07   a 4.026097537396293 1.7079e-07 au q 3.032391248441213 1.15e-06 au i 12.32562024090642 1.7724e-05 deg node 133.0822921177211 5.9376e-05 deg peri 42.43114323489593 0.00014239 deg M 44.59810718499909 7.76e-05 deg tp 2455697.956731221006 (2011-May-16.45673122) 0.00062514 TDB period 2950.698697022303 8.08 0.00018776 5.141e-07 d yr n .1220050018537284 7.7635e-09 deg/d Q 5.019803826351373 2.1295e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 1.579887204155041E-7 8.782E-9 A2 [EST] -7.721278197687189E-9 2.69E-10   Orbit Determination Parameters    # obs. used (total)      573      data-arc span      25635 days (70.18 yr)      first obs. used      1950-04-20      last obs. used      2020-06-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .7882      source      ORB      producer      Otto Matic      solution date      2020-Jul-01 23:45:37   Additional Information  Earth MOID = 2.05286 au   Jupiter MOID = .264531 au   T_jup = 2.958  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 7.2   0.6 52 from 327 observations, assumed slope, autocmod 2.8 comet total magnitude slope K1 20.   n/a 52 autocmod 2.8 comet nuclear magnitude M2 14.8   0.7 52 from 153 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 52 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 52 autocmod 2.8 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2011.4   231P/2009 X1         2003.3   231P/2003 CP7        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-07 08:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin