+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   22P/Kopff Classification: Jupiter-family Comet          SPK-ID: 1000054 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2013-01-28.0] K154/2 (default) [epoch=2003-01-01.0] SAO/2002 [epoch=1996-07-16.0] SAO/1996 [epoch=1990-01-29.0] SAO/1990 [epoch=1983-08-14.0] SAO/1983 [epoch=1977-02-26.0] SAO/1977 [epoch=1970-10-21.0] SAO/1970 [epoch=1964-05-05.0] SAO/1964 [epoch=1958-02-06.0] SAO/1958 [epoch=1951-10-01.0] SAO/1951 [epoch=1945-08-13.0] SAO/1945 [epoch=1939-02-26.0] SAO/1939 [epoch=1932-09-10.0] SAO/1932 [epoch=1926-02-14.0] SAO/1926 [epoch=1919-06-11.0] SAO/1919 [epoch=1906-04-20.0] SAO/1906 Orbital Elements at Epoch 2456320.5 (2013-Jan-28.0) TDB Reference: JPL K154/2 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5449330786381598 9.4767e-08   a 3.455718371274002 4.7976e-07 AU q 1.572583120309213 3.4319e-07 AU i 4.727895306775099 5.5739e-06 deg node 120.8617874542183 4.8999e-05 deg peri 162.6413487884885 5.6354e-05 deg M 206.2686936596382 4.5382e-05 deg tp 2457322.495466164691 (2015-Oct-26.99546616) 0.00050298 JED period 2346.421014732397 6.42 0.00048863 1.338e-06 d yr n .1534251516414487 3.195e-08 deg/d Q 5.338853622238792 7.412e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 6.077994065088044E-10 7.623E-11 A2 [EST] -8.329563492682454E-10 3.763E-12   Orbit Determination Parameters    # obs. used (total)      2715      data-arc span      6623 days (18.13 yr)      first obs. used      1994-11-30      last obs. used      2013-01-17      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      1      fit RMS      .87857      data source      ORB      producer      Alan B. Chamberlin      solution date      2013-Jan-28 09:47:57   Additional Information  Earth MOID = .558369 AU   T_jup = 2.868  [ 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 12.0 mag 1. K154/2 2 parameter fit from 600 observations, autocmod 2.5b comet total magnitude slope K1 8.   n/a K154/2 autocmod 2.5b diameter diameter 3.0 km 0.4 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   geometric albedo albedo 0.05   0.01 n/a   22P/Kopff          Discovered 1906-Aug-22 by Kopff at Konigstuhl Observatory, Germany 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   1996.5           1994s   1990.1       1990 I   1988k   1983.7       1983 XIII   1982k   1977.3       1977 V   1976b   1970.8       1970 XI   1970c   1964.4       1964 III   1963i   1958.0       1958 I   1958d   1951.6       1951 VII   1951e   1945.2       1945 V   1945b   1938.7       1939 II   1939e   1932.3       1932 III   1932e   1925.9       1926 II   1926c   1919.5   22P/1919 O1   1919 I   1919a   1906.6   22P/1906 Q1   1906 IV   1906e  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-22 13:09 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin