+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   82P/Gehrels 3 Classification: Encke-type Comet          SPK-ID: 1000031 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2002-Mar-25.0] 18 (default) [epoch=1993-Aug-01.0] SAO/1993 [epoch=1985-May-15.0] SAO/1985 [epoch=1977-Apr-07.0] SAO/1977 Orbital Elements at Epoch 2452358.5 (2002-Mar-25.0) TDB Reference: JPL 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1238890301135609 6.7329e-07   a 4.138932388516853 2.5154e-07 au q 3.626164069197896 2.871e-06 au i 1.12658939241537 2.2149e-05 deg node 239.6239758071735 0.0017921 deg peri 227.6579311368321 0.0018046 deg M 24.03667946810931 0.000167 deg tp 2452153.146127854093 (2001-Aug-31.64612785) 0.001411 TDB period 3075.607596740213 8.42 0.00028038 7.676e-07 d yr n .1170500425286887 1.067e-08 deg/d Q 4.651700707835809 2.827e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] 2.93561772446461E-11 5.002E-12 ALN [SET] .0408373333128795 n/a NK [SET] 2.6 n/a NM [SET] 2. n/a NN [SET] 3. n/a R0 [SET] 5. n/a   Orbit Determination Parameters    # obs. used (total)      140      data-arc span      16277 days (44.56 yr)      first obs. used      1975-10-27      last obs. used      2020-05-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .63397      source      ORB      producer      Javier Roa      solution date      2020-Jun-02 14:00:46   Additional Information  Earth MOID = 2.64312 au   Jupiter MOID = .511208 au   T_jup = 3.027   Nongrav. accels. using CO driven g(r)  [ 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 7.5   1. 18 from 56 observations, assumed slope, autocmod 2.8 comet total magnitude slope K1 18.5   n/a 18 autocmod 2.8 comet nuclear magnitude M2 16.4   1. 18 from 14 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 18 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 18 autocmod 2.8 diameter diameter 1.46 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264   82P/Gehrels 3          Discovered 1975-Oct-27 by Gehrels, Tom at Palomar Mountain Observatory, California discovered on plate/photo taken on discovery date as well as 10/28,30 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1993.2       1993 XIV   1992v   1984.8   82P/1984 P1   1985 IV   1984l   1976.4   82P/1975 U1   1977 VII   1975o  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 17:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin