+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   84P/Giclas Classification: Jupiter-family Comet          SPK-ID: 1000033 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2011-Jan-19.0] 47 (default) [epoch=1999-Aug-10.0] SAO/1999 [epoch=1992-Sep-15.0] SAO/1992 [epoch=1985-Sep-12.0] SAO/1985 [epoch=1978-Nov-28.0] SAO/1978 [epoch=1931-Dec-05.0] SAO/1931 Orbital Elements at Epoch 2455580.5 (2011-Jan-19.0) TDB Reference: JPL 47 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4942446592077356 1.6082e-07   a 3.642270481317528 2.6735e-08 au q 1.842097748536351 5.7813e-07 au i 7.282325825880715 1.2589e-05 deg node 112.4098898502675 6.1366e-05 deg peri 276.3346585697539 6.5956e-05 deg M 230.1127050541269 1.6021e-05 deg tp 2456496.553607795693 (2013-Jul-23.05360780) 0.00011848 TDB period 2538.965023052299 6.95 2.7955e-05 7.654e-08 d yr n .1417900588355543 1.5612e-09 deg/d Q 5.442443214098705 3.9949e-08 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 6.02482324821239E-10 4.135E-11 A2 [EST] -2.326360325980224E-11 3.41E-13   Orbit Determination Parameters    # obs. used (total)      1597      data-arc span      15464 days (42.34 yr)      first obs. used      1978-09-03      last obs. used      2021-01-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65725      source      ORB      producer      Davide Farnocchia      solution date      2021-Jan-19 12:49:18   Additional Information  Earth MOID = .864569 au   Jupiter MOID = .55412 au   T_jup = 2.872  [ 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 14.6   1. 47 2 parameter fit from 672 observations, autocmod 2.9a comet total magnitude slope K1 5.25   n/a 47 autocmod 2.9a 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   1985.8   84P/1985 M1   1985 XV   1985g   1978.8   84P/1978 R2   1978 XXII   1978k  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 09:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin