+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   8P/Tuttle Classification: Jupiter-family Comet* [NEO]          SPK-ID: 1000099 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2007-Dec-19.0] K215/8 (default) [epoch=1994-Jun-17.0] SAO/1994 [epoch=1980-Dec-27.0] SAO/1980 [epoch=1967-Apr-20.0] SAO/1967 [epoch=1939-Oct-24.0] SAO/1939 [epoch=1926-May-05.0] SAO/1926 [epoch=1912-Nov-14.0] SAO/1912 [epoch=1899-Apr-16.0] SAO/1899 [epoch=1885-Sep-16.0] SAO/1885 [epoch=1871-Nov-29.0] SAO/1871 [epoch=1858-Feb-10.0] SAO/1858 [epoch=1790-Feb-06.0] SAO/1790 Orbital Elements at Epoch 2454453.5 (2007-Dec-19.0) TDB Reference: JPL K215/8 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .8198309621312905 1.718e-07   a 5.700931065309506 5.8349e-06 au q 1.027131264992651 1.0089e-07 au i 54.98331415077818 1.1818e-05 deg node 270.3415874631229 4.914e-06 deg peri 207.5071341554478 1.8828e-05 deg M 357.1744012668671 5.1146e-06 deg tp 2454492.523399293734 (2008-Jan-27.02339929) 1.4551e-05 TDB period 4971.839625001457 13.61 0.007633 2.09e-05 d yr n .07240780619505492 1.1116e-07 deg/d Q 10.37473086562636 1.0619e-05 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 5.501437691421635E-10 8.933E-11 A2 [EST] 1.393281828925108E-10 2.149E-13 A3 [EST] -4.64177126026373E-10 1.047E-10   Orbit Determination Parameters    # obs. used (total)      1623      data-arc span      19731 days (54.02 yr)      first obs. used      1967-01-07      last obs. used      2021-01-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .69565      source      ORB      producer      Davide Farnocchia      solution date      2021-Feb-01 11:19:36   Additional Information  Earth MOID = .0952255 au   Jupiter MOID = .738814 au   T_jup = 1.601  [ 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. K215/8 2 parameter fit from 195 observations, autocmod 2.9a comet total magnitude slope K1 5.25   n/a K215/8 autocmod 2.9a diameter diameter 4.5 km 1. Harmon, J.K.;Nolan,M.C.;Howell,E.S.;Giorgini,J.D. (2008) IAUC 8909 equivalent diameter of a sphere having a volume equal to the sum of a 3km and 4km sphere 8P/Tuttle          Discovered 1790-Jan-09 by Mechain, Pierre F. A. at Paris, 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   1994.5       1994 XV   1992r   1980.8       1980 XIII   1980h   1967.2       1967 V   1967a   1940.0       1939 X   1939k   1926.4       1926 IV   1926a   1912.8       1912 IV   1912b   1899.2       1899 III   1899b   1885.6       1885 IV   1885b   1871.9   8P/1871 T1   1871 III   1871d   1858.3   8P/1858 A1   1858 I     1790.3   8P/1790 A2   1790 II    [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 17:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin