+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   287P/Christensen Classification: Jupiter-family Comet          SPK-ID: 1002414 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2457800.5 (2017-Feb-16.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2690855682830409 7.2381e-06   a 4.175589673964971 5.8146e-05 au q 3.05199875362931 1.2834e-05 au i 16.30241060819607 3.8867e-05 deg node 139.0469656594007 9.3181e-05 deg peri 188.9032147685223 0.0015794 deg M 90.26207917496895 0.0027422 deg tp 2457019.091768763866 (2014-Dec-27.59176876) 0.0075766 TDB period 3116.557537963506 8.53 0.065098 0.0001782 d yr n .1155120659942122 2.4128e-06 deg/d Q 5.299180594300633 7.3792e-05 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 8.279241444688861E-7 1.896E-7 A2 [EST] 3.841852224195566E-7 9.151E-8 A3 [EST] -6.872296817210905E-7 2.654E-8   Orbit Determination Parameters    # obs. used (total)      222      data-arc span      3767 days (10.31 yr)      first obs. used      2006-08-30      last obs. used      2016-12-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      condition code      4      norm. resid. RMS      .75661      source      ORB      producer      Davide Farnocchia      solution date      2017-Jan-24 09:31:50   Additional Information  Earth MOID = 2.04198 au   Jupiter MOID = .0627023 au   T_jup = 2.902  [ 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 4.6   0.8 34 2 parameter fit from 137 observations, autocmod 2.6h comet total magnitude slope K1 24.   n/a 34 autocmod 2.6h comet nuclear magnitude M2 14.8   1. 34 from 43 observations, autocmod 2.6h comet nuclear magnitude slope K2 5.   n/a 34 autocmod 2.6h comet nuclear phase coefficient PC 0.03   n/a 34 autocmod 2.6h [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2015.0   287P/2013 L1         2006.5   287P/2006 R2        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-07 08:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin