+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   71P/Clark Classification: Jupiter-family Comet          SPK-ID: 1000014 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2017-May-26.0] K171/5 (default) [epoch=2008-Nov-14.0] K112/1 [epoch=2005-Nov-21.0] K062/1 [epoch=1998-Jan-27.0] J953/6 [epoch=1995-Jun-12.0] SAO/1995 [epoch=1989-Nov-10.0] SAO/1989 [epoch=1984-May-20.0] SAO/1984 [epoch=1978-Nov-28.0] SAO/1978 [epoch=1973-Jun-07.0] SAO/1973 Orbital Elements at Epoch 2457899.5 (2017-May-26.0) TDB Reference: JPL K171/5 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4943781414695106 2.2708e-06   a 3.137154706747789 1.7737e-05 au q 1.58621399332349 1.9e-06 au i 9.445340590021177 1.6822e-05 deg node 59.44627994746336 3.3211e-05 deg peri 208.9167867411067 0.00010679 deg M 353.7555636783762 7.5976e-05 deg tp 2457934.704085862553 (2017-Jun-30.20408586) 0.00015615 TDB period 2029.562038551383 5.56 0.017213 4.713e-05 d yr n .1773781698523259 1.5043e-06 deg/d Q 4.688095420172089 2.6507e-05 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 2.109580211754518E-8 1.198E-9 A2 [EST] 8.647826217701629E-9 4.145E-10   Orbit Determination Parameters    # obs. used (total)      916      data-arc span      705 days (1.93 yr)      first obs. used      2016-02-12      last obs. used      2018-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      3      norm. resid. RMS      .57156      source      ORB      producer      Javier Roa      solution date      2018-Apr-04 15:13:30   Additional Information  Earth MOID = .57821 au   Jupiter MOID = .554913 au   T_jup = 2.990  [ 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 comet total magnitude M1 11.7   1. K171/5 2 parameter fit from 217 observations, autocmod 2.6m comet total magnitude slope K1 12.   n/a K171/5 autocmod 2.6m comet nuclear magnitude M2 14.6   0.9 K171/5 from 617 observations, autocmod 2.6m comet nuclear magnitude slope K2 5.   n/a K171/5 autocmod 2.6m comet nuclear phase coefficient PC 0.03   n/a K171/5 autocmod 2.6m diameter diameter 1.36 km n/a Lamy, P; Toth, I; Fernandez, Y; Weaver, H.; (2004) Comets II, pp. 223-264   71P/Clark          Discovered 1973-Jun-09 by Clark, Michael at Mount John University Obs., New Zealand discovered on plate/photo taken on discovery date Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1995.3           1994t   1989.7       1989 XX   1989h   1984.2       1984 VIII   1983w   1978.6   71P/1978 G1   1978 XXIII   1978g   1973.0   71P/1973 L1   1973 V   1973i  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 06:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin