+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   130P/McNaught-Hughes Classification: Jupiter-family Comet          SPK-ID: 1000134 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2013-03-13.0] 37 (default) [epoch=1998-03-08.0] SAO/1998 [epoch=1991-07-03.0] SAO/1991 Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .411707591006842 1.6294e-07   a 3.543602890259892 1.7564e-07 AU q 2.084674680826109 5.059e-07 AU i 7.339980323306746 7.8255e-06 deg node 89.70016224353954 8.393e-05 deg peri 224.440632076287 0.00011613 deg M 92.30573290980611 3.3901e-05 deg tp 2455739.770272852574 (2011-Jun-27.27027285) 0.00022856 JED period 2436.497654948806 6.67 0.00018115 4.96e-07 d yr n .1477530664840981 1.0985e-08 deg/d Q 5.002531099693674 2.4795e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -7.237812329383532E-10 1.951E-10 A2 [EST] 2.829353933044376E-11 4.026E-12   Orbit Determination Parameters    # obs. used (total)      739      data-arc span      7428 days (20.34 yr)      first obs. used      1991-09-14      last obs. used      2012-01-15      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .67058      data source      ORB      producer      Ryan S. Park      solution date      2013-Mar-03 19:44:04   Additional Information  Earth MOID = 1.07639 AU   T_jup = 2.960  [ 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 10.5 mag n/a ICQ 2004 Handbook   comet total magnitude slope K1 17.0   n/a ICQ 2004 Handbook   diameter diameter 4.2 km n/a Scotti,J (1994) BAAS 26:1375   130P/McNaught-Hughes          Discovered 1991-Sep-30 by McNaught, Robert H. at U. K. Schmidt Telescope Unit, Siding Spring 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   1998.1   130P/1997 H1         1991.5   130P/1991 S1   1991 IX   1991y  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-Jun-19 23:35 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin