+ 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-Sep-23.0] K215/2 (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 2454366.5 (2007-Sep-23.0) TDB Reference: JPL K215/2 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .8197966224140293 1.8483e-08   a 5.699745304269537 6.7942e-07 au q 1.027113355209147 2.1184e-07 au i 54.98317381441031 1.6388e-05 deg node 270.3416211910725 1.1095e-05 deg peri 207.509542802402 2.4835e-05 deg M 350.8719002741928 2.1575e-06 deg tp 2454492.525803910571 (2008-Jan-27.02580391) 1.2153e-05 TDB period 4970.288534374401 13.61 0.0008887 2.433e-06 d yr n .0724304026839183 1.2951e-08 deg/d Q 10.37237725332993 1.2364e-06 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 6.083735556013546E-10 1.041E-10 A2 [EST] 1.393061730131474E-10 2.246E-13 A3 [EST] -5.188475837641523E-10 1.06E-10   Orbit Determination Parameters    # obs. used (total)      1586      data-arc span      19529 days (53.47 yr)      first obs. used      1967-01-07      last obs. used      2020-06-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .68995      source      ORB      producer      Javier Roa      solution date      2020-Jul-06 14:30:56   Additional Information  Earth MOID = .0960284 au   Jupiter MOID = .738317 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 10.7   1. K215/2 2 parameter fit from 141 observations, autocmod 2.8 comet total magnitude slope K1 16.   n/a K215/2 autocmod 2.8 comet nuclear magnitude M2 16.7   0.8 K215/2 from 1220 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a K215/2 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a K215/2 autocmod 2.8 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   1980.9       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   1858.4   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-Aug-04 09:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin