+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   96P/Machholz 1 Classification: Jupiter-family Comet* [NEO]          SPK-ID: 1000061 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2013-03-13.0] 52 (default) [epoch=2002-01-06.0] SAO/2002 [epoch=1996-10-04.0] SAO/1996 [epoch=1991-07-03.0] SAO/1991 [epoch=1986-05-10.0] SAO/1986 Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB Reference: JPL 52 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9591971246514069 4.7009e-08   a 3.033491417997365 2.4509e-08 AU q .1237751721995733 1.4287e-07 AU i 58.30767839593668 4.4924e-05 deg node 94.32300244265228 1.1819e-05 deg peri 14.75719299290386 2.0958e-05 deg M 44.99643506513821 2.4398e-06 deg tp 2456123.293954107550 (2012-Jul-14.79395411) 1.1528e-05 JED period 1929.801247489456 5.28 2.3388e-05 6.403e-08 d yr n .1865477081996585 2.2608e-09 deg/d Q 5.943207663795158 4.8018e-08 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 1.070442081056858E-10 1.742E-11 A2 [EST] -9.386447734996017E-13 6.311E-15   Orbit Determination Parameters    # obs. used (total)      1090      data-arc span      9642 days (26.40 yr)      first obs. used      1986-05-13      last obs. used      2012-10-05      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .74525      data source      ORB      producer      Ryan S. Park      solution date      2013-Mar-03 19:26:28   Additional Information  Earth MOID = .333773 AU   T_jup = 1.942  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.3 mag 1. 52 2 parameter fit from 163 observations, autocmod 2.5b comet total magnitude slope K1 11.   n/a 52 autocmod 2.5b comet nuclear magnitude M2 16.5 mag 1. 52 from 737 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a 52 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a 52 autocmod 2.5b 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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-21 20:46 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin