+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   89P/Russell 2 Classification: Jupiter-family Comet          SPK-ID: 1000073 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2016-Jun-21.0] 21 (default) [epoch=1994-Oct-15.0] SAO/1994 [epoch=1987-Jun-14.0] SAO/1987 [epoch=1980-May-01.0] SAO/1980 Orbital Elements at Epoch 2457560.5 (2016-Jun-21.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4080083815513693 3.4907e-07   a 3.751002285783576 1.1611e-06 au q 2.220561913965532 1.974e-06 au i 12.07653613877625 1.8333e-05 deg node 41.44521124700714 9.1492e-05 deg peri 250.1414428824369 0.00029325 deg M 336.0314231006254 0.00017621 deg tp 2457737.168519034023 (2016-Dec-14.66851903) 0.00138 TDB period 2653.502004697989 7.26 0.0012321 3.373e-06 d yr n .135669767485619 6.2995e-08 deg/d Q 5.28144265760162 1.6349e-06 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 7.501812884983252E-9 1.006E-9 A2 [EST] -3.394047270187426E-10 1.35E-11 A3 [EST] -4.244969252452372E-10 3.009E-10   Orbit Determination Parameters    # obs. used (total)      188      data-arc span      13592 days (37.21 yr)      first obs. used      1980-08-09      last obs. used      2017-10-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .72631      source      ORB      producer      Shantanu Naidu      solution date      2017-Nov-06 15:21:31   Additional Information  Earth MOID = 1.23952 au   Jupiter MOID = .740934 au   T_jup = 2.903  [ 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 12.6   1. 21 2 parameter fit from 108 observations, autocmod 2.6i comet total magnitude slope K1 12.   n/a 21 autocmod 2.6i comet nuclear magnitude M2 16.6   01. 21 from 30 observations, autocmod 2.6i comet nuclear magnitude slope K2 5.   n/a 21 autocmod 2.6i comet nuclear phase coefficient PC 0.03   n/a 21 autocmod 2.6i diameter diameter 2.8 km n/a Scotti,J (1994) BAAS 26:1375   89P/Russell 2          Discovered 1980-Sep-28 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   1995.2       1994 XXIX   1994e   1987.9   89P/1987 N1   1987 XI   1987q   1980.6   89P/1980 S1   1980 III   1980o  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 17:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin