+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   96P/Machholz 1 Classification: Jupiter-family Comet* [NEO]          SPK-ID: 1000061 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2008-Nov-03.0] K173/5 (default) [epoch=2007-Sep-18.0] K126/1 [epoch=2002-Jan-06.0] SAO/2002 [epoch=1996-Oct-04.0] SAO/1996 [epoch=1991-Jul-03.0] SAO/1991 [epoch=1986-May-10.0] SAO/1986 Orbital Elements at Epoch 2454773.5 (2008-Nov-03.0) TDB Reference: JPL K173/5 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9592074836894154 4.3922e-08   a 3.032767858374081 3.0673e-08 au q .1237142323289413 1.3326e-07 au i 58.53858182853028 5.7212e-05 deg node 94.35081293062883 1.4304e-05 deg peri 14.7463138854509 1.861e-05 deg M 107.7407308761973 1.9003e-06 deg tp 2454196.156080118566 (2007-Apr-05.65608012) 1.3023e-05 TDB period 1929.110833637702 5.28 2.9266e-05 8.013e-08 d yr n .1866144721820633 2.8311e-09 deg/d Q 5.94182148441922 6.0094e-08 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 7.035676975844572E-11 9.644E-11 A2 [EST] -1.76259481435609E-12 4.681E-14 A3 [EST] -2.102047080596514E-10 1.145E-10   Orbit Determination Parameters    # obs. used (total)      963      data-arc span      3829 days (10.48 yr)      first obs. used      2007-04-09      last obs. used      2017-10-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .6452      source      ORB      producer      Javier Roa      solution date      2020-Jun-02 14:02:54   Additional Information  Earth MOID = .334629 au   Jupiter MOID = .612925 au   T_jup = 1.941  [ 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 13.4   2. K173/5 2 parameter fit from 136 observations, autocmod 2.8 comet total magnitude slope K1 11.25   n/a K173/5 autocmod 2.8 diameter diameter 6.4 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264   96P/Machholz 1          Discovered 1986-May-12 by Machholz, Donald E. at San Jose, California Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1991.4       1991 XII     1986.1   96P/1986 J2   1986 VIII   1986e  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 02:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin