+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   27P/Crommelin Classification: Halley-type Comet* [NEO]          SPK-ID: 1000016 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2013-Mar-13.0] K113/4 (default) [epoch=1984-Jun-29.0] J843/16 [epoch=1956-Oct-14.0] SAO/1956 [epoch=1928-Nov-10.0] SAO/1928 [epoch=1873-Nov-18.0] SAO/1873 [epoch=1818-Feb-20.0] SAO/1818 Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB Reference: JPL K113/4 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9189810923126022 0.00017002   a 9.235960944226864 0.022659 au q .748287467144728 0.00027109 au i 28.96687278723059 0.0011605 deg node 250.6264098390235 0.0041998 deg peri 196.0253968913816 0.017961 deg M 20.61577251683614 0.075722 deg tp 2455777.391090241354 (2011-Aug-03.89109024) 0.0046592 TDB period 10252.30596333479 28.07 37.729 0.1033 d yr n .03511405153996224 0.00012922 deg/d Q 17.723634421309 0.043483 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -3.653645033749881E-8 1.055E-7 A2 [EST] -1.713114322066723E-9 7.261E-9 A3 [EST] 2.081362723681325E-9 1.936E-9   Orbit Determination Parameters    # obs. used (total)      154      data-arc span      259 days      first obs. used      2011-05-12      last obs. used      2012-01-26      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      6      norm. resid. RMS      .70281      source      ORB      producer      Ryan S. Park      solution date      2013-Mar-03 19:22:50   Additional Information  Earth MOID = .215189 au   Jupiter MOID = 1.02145 au   T_jup = 1.483  [ 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 12.8   0.7 K113/4 2 parameter fit from 36 observations, autocmod 2.5b comet total magnitude slope K1 28.   n/a K113/4 autocmod 2.5b comet nuclear magnitude M2 16.3   0.6 K113/4 from 50 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a K113/4 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a K113/4 autocmod 2.5b 27P/Crommelin          Discovered 1818-Feb-23 by Pons, Jean Louis at Marseilles Observatory, France Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1983.5       1984 IV   1983n   1955.4   27P/1956 S1   1956 VI   1956g   1927.4   27P/1928 W1   1928 III   1928b   1871.2   27P/1873 V1   1873 VII   1873g   1815.1   27P/1818 D1   1818 I    [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 09:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin