+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   41P/Tuttle-Giacobini-Kresak Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000100 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2017-Apr-01.0] K171/18 (default) [epoch=2008-Mar-18.0] K173/9 [epoch=2006-Mar-27.0] K064/9 [epoch=2001-Jan-11.0] SAO/2001 [epoch=1995-Jul-22.0] SAO/1995 [epoch=1990-Jan-29.0] SAO/1990 [epoch=1979-Jan-07.0] SAO/1978 [epoch=1973-Jun-07.0] SAO/1973 [epoch=1962-Apr-06.0] SAO/1962 [epoch=1951-Apr-24.0] SAO/1951 [epoch=1907-May-25.0] SAO/1907 [epoch=1858-May-01.0] SAO/1858 Orbital Elements at Epoch 2457844.5 (2017-Apr-01.0) TDB Reference: JPL K171/18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6612506884287184 3.6904e-07   a 3.085003278874254 3.4009e-06 au q 1.0450427369138 3.3356e-08 au i 9.229131696230207 2.6651e-06 deg node 141.066286210229 1.4021e-05 deg peri 62.15858521740492 1.9255e-05 deg M 357.86232425359 3.2607e-06 deg tp 2457856.252254856775 (2017-Apr-12.75225486) 7.858e-06 TDB period 1979.164405801095 5.42 0.0032727 8.96e-06 d yr n .1818949446265354 3.0078e-07 deg/d Q 5.124963820834708 5.6498e-06 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 1.7443075575162E-8 2.164E-10 A2 [EST] 4.288032804305828E-9 2.154E-10 A3 [EST] 1.47032014107612E-9 1.171E-10 ALN [SET] 24.491 n/a DT [EST] 11.40671877972504 .5944 R0 [SET] 1. n/a   Orbit Determination Parameters    # obs. used (total)      4259      # delay obs. used      2      # Doppler obs. used      7      data-arc span      262 days      first obs. used      2016-11-10      last obs. used      2017-07-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .41437      source      ORB      producer      Davide Farnocchia      solution date      2018-Jan-31 15:24:02   Additional Information  Earth MOID = .133597 au   Jupiter MOID = .488323 au   T_jup = 2.827   Using nonstandard R0=1 au and ALN=24.491  [ 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 15.3   1. K171/18 from 493 observations, assumed slope, autocmod 2.6l comet total magnitude slope K1 17.   n/a K171/18 autocmod 2.6l diameter diameter 1.4 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264   41P/Tuttle-Giacobini-Kresak          Discovered 1858-May-03 by Tuttle, Horace at Harvard College Observatory, Massachusetts Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1990.2       1990 II   1989b1   1979.3       1978 XXV   1978r   1973.9       1973 VI   1973b   1963.1       1962 V   1962b   1952.3   41P/1951 H1   1951 IV   1951f   1908.9   41P/1907 L1   1907 III   1907c   1860.1   41P/1858 J1   1858 III    [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 22:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin