+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   74P/Smirnova-Chernykh Classification: Encke-type Comet          SPK-ID: 1000088 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2013-03-13.0] K093/30 (default) [epoch=1992-08-06.0] J922/1 [epoch=1984-03-01.0] J842/2 [epoch=1975-08-16.0] SAO/1975 [epoch=1967-01-30.0] SAO/1967 Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB Reference: JPL K093/30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1479169346709769 8.1372e-08   a 4.164814066158224 2.581e-07 AU q 3.548767536017532 2.986e-07 AU i 6.650973670495322 5.6153e-06 deg node 77.08388746933821 8.6242e-05 deg peri 86.54958679130598 0.00010129 deg M 153.6673385207856 4.4111e-05 deg tp 2455039.332055403075 (2009-Jul-26.83205540) 0.00035092 JED period 3104.501351081603 8.50 0.00028859 7.901e-07 d yr n .1159606517402792 1.078e-08 deg/d Q 4.780860596298916 2.9628e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 2.28563532419461E-7 2.835E-8 A2 [EST] -1.456573759009562E-7 3.751E-9 A3 [EST] 3.168749985103577E-7 4.381E-8   Orbit Determination Parameters    # obs. used (total)      2577      data-arc span      8762 days (23.99 yr)      first obs. used      1988-09-10      last obs. used      2012-09-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .72608      data source      ORB      producer      Ryan S. Park      solution date      2013-Mar-03 19:25:18   Additional Information  Earth MOID = 2.56603 AU   T_jup = 3.007  [ 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 7.3 mag 1. K093/30 2 parameter fit from 961 observations, autocmod 2.5b comet total magnitude slope K1 13.   n/a K093/30 autocmod 2.5b comet nuclear magnitude M2 11.9 mag 0.6 K093/30 from 1254 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a K093/30 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a K093/30 autocmod 2.5b diameter diameter 4.46 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264   74P/Smirnova-Chernykh          Discovered 1975-Mar-(late) by Smirnova, Tamara Mikhajlovna at Crimean Astrophysical Observatory discovered on plate/photo taken on 3/4,16 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1992.6       1992 XXI     1984.1       1984 V     1975.6   74P/1975 E2   1975 VII   1975e   1967.1   74P/1967 EU   1967 XV    [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-Jun-18 23:45 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin