+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   94P/Russell 4 Classification: Encke-type Comet          SPK-ID: 1000075 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2013-03-13.0] 34 (default) [epoch=1997-02-01.0] SAO/1997 [epoch=1990-07-08.0] SAO/1990 [epoch=1984-01-21.0] SAO/1984 Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .363567150661434 1.4431e-07   a 3.5127785598432 1.399e-07 AU q 2.235647667936432 5.5403e-07 AU i 6.183904445397216 5.7037e-06 deg node 70.91336693532239 0.00010524 deg peri 92.6613043668964 0.00011469 deg M 161.5742618247869 2.6719e-05 deg tp 2455285.194806948297 (2010-Mar-29.69480695) 0.00014951 JED period 2404.775767566009 6.58 0.00014366 3.933e-07 d yr n .1497021073047378 8.9432e-09 deg/d Q 4.789909451749967 1.9077e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 2.742767704946408E-10 2.21E-10 A2 [EST] 1.80912439871725E-11 3.629E-12   Orbit Determination Parameters    # obs. used (total)      1044      data-arc span      9958 days (27.26 yr)      first obs. used      1984-03-02      last obs. used      2011-06-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .68463      data source      ORB      producer      Ryan S. Park      solution date      2013-Mar-03 19:37:51   Additional Information  Earth MOID = 1.25402 AU   T_jup = 3.003  [ 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 12.9 mag 0.9 34 2 parameter fit from 333 observations, autocmod 2.5b comet total magnitude slope K1 10.   n/a 34 autocmod 2.5b comet nuclear magnitude M2 15.0 mag 0.6 34 from 568 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a 34 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a 34 autocmod 2.5b 94P/Russell 4          Discovered 1984-Mar-07 by Russell, Kenneth S. 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   1990.5   94P/1989 X2   1990 XI   1989g1   1983.9   94P/1984 E1   1984 I   1984d  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-23 17:57 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin