+ 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-02.0] K215/6 (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 2454436.5 (2007-Dec-02.0) TDB Reference: JPL K215/6 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .8198210766542805 1.1803e-07   a 5.700607824699933 4.3091e-06 au q 1.027129380270618 1.2713e-07 au i 54.98320551177169 1.3076e-05 deg node 270.3416504896738 5.5856e-06 deg peri 207.507522704472 2.1281e-05 deg M 355.9430917200544 5.4344e-06 deg tp 2454492.523838592604 (2008-Jan-27.02383859) 1.517e-05 TDB period 4971.416778889489 13.61 0.0056368 1.543e-05 d yr n .07241396487389587 8.2107e-08 deg/d Q 10.37408626912925 7.8418e-06 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 5.762124781272548E-10 9.101E-11 A2 [EST] 1.393617473878645E-10 2.165E-13 A3 [EST] -4.771233540626965E-10 1.05E-10   Orbit Determination Parameters    # obs. used (total)      1615      data-arc span      19631 days (53.75 yr)      first obs. used      1967-01-07      last obs. used      2020-10-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .69606      source      ORB      producer      Davide Farnocchia      solution date      2020-Oct-19 09:40:30   Additional Information  Earth MOID = .0950564 au   Jupiter MOID = .738702 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 12.3   1. K215/6 2 parameter fit from 177 observations, autocmod 2.9a comet total magnitude slope K1 10.5   n/a K215/6 autocmod 2.9a comet nuclear magnitude M2 16.7   0.8 K215/6 from 1222 observations, autocmod 2.9a comet nuclear magnitude slope K2 5.   n/a K215/6 autocmod 2.9a comet nuclear phase coefficient PC 0.03   n/a K215/6 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   1872.0   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 ] 2020-Oct-23 09:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin