+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   361P/Spacewatch Classification: Jupiter-family Comet          SPK-ID: 1003533 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2458011.5 (2017-Sep-15.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4378875714688859 1.4264e-07   a 4.945680545246325 2.3717e-07 au q 2.780028502027496 6.7576e-07 au i 13.88283311952524 1.7851e-05 deg node 203.277939281313 6.8497e-05 deg peri 219.2428618454913 0.00016954 deg M 333.9573771090049 7.2605e-05 deg tp 2458302.116146167932 (2018-Jul-02.61614617) 0.00080965 TDB period 4017.330092224752 11.00 0.00028898 7.912e-07 d yr n .08961175500533393 6.4461e-09 deg/d Q 7.111332588465154 3.4103e-07 au   Orbit Determination Parameters    # obs. used (total)      380      data-arc span      4910 days (13.44 yr)      first obs. used      2006-10-11      last obs. used      2020-03-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .66592      source      ORB      producer      Otto Matic      solution date      2020-Apr-06 08:43:30   Additional Information  Earth MOID = 1.8081 au   Jupiter MOID = .381875 au   T_jup = 2.754  [ 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 absolute magnitude H 14.7   n/a MPO170157   comet total magnitude M1 4.6   0.8 16 2 parameter fit from 240 observations, autocmod 2.8 comet total magnitude slope K1 23.5   n/a 16 autocmod 2.8 comet nuclear magnitude M2 14.0   0.5 16 from 113 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 16 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 16 autocmod 2.8 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2018.5   361P/2017 S4         2007.5   361P/2006 UR111        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-05 11:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin