+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   C/1965 S1-A (Ikeya-Seki) Classification: Comet          SPK-ID: 1001121 [ Ephemeris | Orbit Diagram | Orbital Elements ] [ show orbit diagram ] Orbital Elements at Epoch 2439040.5 (1965-Oct-07.0) TDB Reference: SAO_2008 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.999915 n/a   a 91.6000000 n/a AU q 0.007786 n/a AU i 141.8642 n/a deg node 346.9947 n/a deg peri 69.0486 n/a deg M 359.984054 n/a deg tp 2439054.6837 (1965-Oct-21.18370000) n/a JED period 321420 880.00 n/a n/a d yr n 0.0011242 n/a deg/d Q 183.1922140 n/a AU   Orbit Determination Parameters    # obs. used (total)      119      data-arc span      115 days      first obs. used      1965-09-21      last obs. used      1966-01-14      producer      Marsden   Additional Information  T_jup = -0.029   2008 SAO Comet Catalog  [ Ephemeris | Orbit Diagram | Orbital Elements ] no physical parameters available Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1965.8   C/1965 S1-A        [ Ephemeris | Orbit Diagram | Orbital Elements ] 2013-May-21 13:50 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin