+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   84P/Giclas Classification: Jupiter-family Comet          SPK-ID: 1000033 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2007-03-01.0] 35 (default) [epoch=1999-08-10.0] SAO/1999 [epoch=1992-09-15.0] SAO/1992 [epoch=1985-09-12.0] SAO/1985 [epoch=1978-11-28.0] SAO/1978 [epoch=1931-12-05.0] SAO/1931 Orbital Elements at Epoch 2454160.5 (2007-Mar-01.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.492424263364939 2.3973e-07   a 3.64803827001798 7.0639e-08 AU q 1.85165571217727 8.8552e-07 AU i 7.28106171190454 1.3664e-05 deg node 112.472385393478 9.081e-05 deg peri 276.3197237919842 0.00010867 deg M 29.07755527387262 1.1603e-05 deg tp 2453954.937971549816 (2006-Aug-07.43797155) 7.7537e-05 JED period 2544.998351651673 6.97 7.392e-05 2.024e-07 d yr n .1414539226582855 4.1086e-09 deg/d Q 5.444420827858681 1.0542e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -1.849282594161015E-11 6.86E-13   Orbit Determination Parameters    # obs. used (total)      623      data-arc span      27575 days (75.50 yr)      first obs. used      1931-09-12      last obs. used      2007-03-12      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      1.0152      data source      ORB      producer      Nick Mastrodemos      solution date      2007-Mar-16 15:05:19   Additional Information  Earth MOID = .874238 AU   T_jup = 2.872  [ 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 12.2 mag 1. 35 from 270 observations, assumed slope, autocmod 2.4 comet total magnitude slope K1 15.   n/a 35 autocmod 2.4 comet nuclear magnitude M2 15.2 mag 0.9 35 from 212 observations, autocmod 2.4 comet nuclear magnitude slope K2 5.   n/a 35 autocmod 2.4 comet nuclear phase coefficient PC 0.03   n/a 35 autocmod 2.4 diameter diameter 1.80 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264   84P/Giclas          Discovered 1978-Sep-08 by Giclas, Henry L. at Lowell Observatory First known observation: 1978/09/03 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1992.7       1992 XXV   1992l   1985.7   84P/1985 M1   1985 XV   1985g   1978.7   84P/1978 R2   1978 XXII   1978k  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-18 18:41 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin