+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   36P/Whipple Classification: Jupiter-family Comet          SPK-ID: 1000105 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2007-Nov-30.0] 17 (default) [epoch=1995-Jan-03.0] SAO/1994 [epoch=1986-Jun-19.0] SAO/1986 [epoch=1978-Apr-02.0] SAO/1978 [epoch=1970-Oct-21.0] SAO/1970 [epoch=1963-May-11.0] SAO/1963 [epoch=1955-Nov-29.0] SAO/1955 [epoch=1948-Jun-18.0] SAO/1948 [epoch=1941-Jan-06.0] SAO/1941 [epoch=1933-Jul-27.0] SAO/1933 [epoch=1926-Feb-14.0] SAO/1926 Orbital Elements at Epoch 2454434.5 (2007-Nov-30.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2580974157837106 8.7359e-08   a 4.164670396906554 4.1714e-08 au q 3.089779729874052 3.6274e-07 au i 9.934980965911562 1.0631e-05 deg node 182.3896555863036 5.0715e-05 deg peri 202.022111634382 5.9384e-05 deg M 186.6948394360372 2.0723e-05 deg tp 2455928.939627142581 (2012-Jan-02.43962714) 0.0001635 TDB period 3104.340713344002 8.50 4.6641e-05 1.277e-07 d yr n .1159666522597023 1.7423e-09 deg/d Q 5.239561063939056 5.2481e-08 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 5.039508373223555E-9 1.043E-9 A2 [EST] -5.367556224074581E-10 3.482E-11   Orbit Determination Parameters    # obs. used (total)      882      data-arc span      26479 days (72.50 yr)      first obs. used      1948-07-18      last obs. used      2021-01-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65134      source      ORB      producer      Davide Farnocchia      solution date      2021-Feb-01 11:23:06   Additional Information  Earth MOID = 2.09588 au   Jupiter MOID = .258223 au   T_jup = 2.952  [ 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 11.3   0.6 17 2 parameter fit from 534 observations, autocmod 2.9a comet total magnitude slope K1 11.75   n/a 17 autocmod 2.9a comet nuclear magnitude M2 14.4   0.8 17 from 213 observations, autocmod 2.9a comet nuclear magnitude slope K2 5.   n/a 17 autocmod 2.9a comet nuclear phase coefficient PC 0.03   n/a 17 autocmod 2.9a diameter diameter 4.56 km n/a Lamy,P.L,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (To be published)   36P/Whipple          Discovered 1933-Oct-15 by Whipple, Fred L. at Harvard College Observatory, Oak Ridge, Mass 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   1995.0       1994 XXXII   1993n   1986.5       1986 XII   1985h   1978.0       1978 VIII   1977h   1969.5       1970 XIV   1969c   1961.0       1963 II   1962f   1952.5       1955 VIII   1955d   1944.0   36P/1940 R1   1948 VI   1947g   1935.5   36P/1933 U1   1933 IV   1933f   1927.0   36P/1925 QD   1926 VIII    [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 09:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin