+ View the NASA Portal + Near-Earth Object (NEO) Project Search JPL JPL Small-Body Database Browser Search: [ help ]   8P/Tuttle Classification: Jupiter-family Comet* [NEO]          SPK-ID: 1000099 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2007-10-01.0] K074/27 (default) [epoch=1994-06-17.0] SAO/1994 [epoch=1980-12-27.0] SAO/1980 [epoch=1967-04-20.0] SAO/1967 [epoch=1939-10-24.0] SAO/1939 [epoch=1926-05-05.0] SAO/1926 [epoch=1912-11-14.0] SAO/1912 [epoch=1899-04-16.0] SAO/1899 [epoch=1885-09-16.0] SAO/1885 [epoch=1871-11-29.0] SAO/1871 [epoch=1858-02-10.0] SAO/1858 [epoch=1790-02-06.0] SAO/1790 Orbital Elements at Epoch 2454374.5 (2007-Oct-01.0) TDB Reference: JPL K074/27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.8197997470243816309221 1.4498e-08   a 5.6998620708785754374048 7.1817e-07 AU q 1.0271165870984511059305 1.5918e-07 AU i 54.983184844602092766763 1.5011e-05 deg node 270.3416520050764 9.9219e-06 deg peri 207.5092459727414 1.9885e-05 deg M 351.4516245290291 1.9365e-06 deg tp 2454492.525550628393 (2008-Jan-27.02555063) 1.2297e-05 JED period 4970.441269280825 13.61 0.0009394 2.572e-06 d yr n .07242817699606147 1.3689e-08 deg/d Q 10.3726075546587 1.3069e-06 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 6.894844426325457E-10 8.358E-11 A2 [EST] 1.370445739396238E-10 1.734E-13 A3 [EST] -4.593469638447816E-10 9.897E-11   Orbit Determination Parameters    # obs. used (total)      1555      data-arc span      15126 days (41.41 yr)      first obs. used      1967-01-07      last obs. used      2008-06-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      quality code      0      fit RMS      .63669      data source      ORB      producer      Nick Mastrodemos      solution date      2008-Jun-25 15:10:45   Additional Information  Earth MOID = .0953103 AU   T_jup = 1.601  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 9.8 mag 1. K074/27 2 parameter fit from 139 observations, autocmod 2.4a comet total magnitude slope K1 21.   n/a K074/27 autocmod 2.4a comet nuclear magnitude M2 16.7 mag 0.8 K074/27 from 1232 observations, autocmod 2.4a comet nuclear magnitude slope K2 5.   n/a K074/27 autocmod 2.4a comet nuclear phase coefficient PC 0.03   n/a K074/27 autocmod 2.4a 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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2010-Feb-10 07:31 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin