+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17P/Holmes Classification: Jupiter-family Comet          SPK-ID: 1000044 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2015-Feb-11.0] K212/14 (default) [epoch=2010-Jan-17.0] K142/1 [epoch=2007-Nov-26.0] K072/1 [epoch=2000-May-16.0] SAO/2000 [epoch=1993-Apr-03.0] SAO/1993 [epoch=1986-Mar-31.0] SAO/1986 [epoch=1979-Feb-16.0] SAO/1979 [epoch=1972-Feb-13.0] SAO/1972 [epoch=1964-Nov-21.0] SAO/1964 [epoch=1906-Mar-11.0] SAO/1906 [epoch=1899-Apr-16.0] SAO/1899 [epoch=1892-Jul-01.0] SAO/1892 Orbital Elements at Epoch 2457064.5 (2015-Feb-11.0) TDB Reference: JPL K212/14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4317519490501375 2.1371e-07   a 3.619799506563556 2.9021e-07 au q 2.056944014434015 9.2709e-07 au i 19.0918205316614 7.6277e-06 deg node 326.7639708316963 4.7601e-05 deg peri 24.53542337513593 6.5081e-05 deg M 45.86180498111855 2.377e-05 deg tp 2456744.039988387259 (2014-Mar-27.53998839) 0.00017962 TDB period 2515.505096846563 6.89 0.00030251 8.282e-07 d yr n .1431124112812556 1.721e-08 deg/d Q 5.182654998693097 4.155e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 4.791743337115952E-9 6.618E-10 A2 [EST] 1.297575992185322E-9 2.357E-10   Orbit Determination Parameters    # obs. used (total)      1697      data-arc span      3665 days (10.03 yr)      first obs. used      2011-01-04      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59323      source      ORB      producer      Davide Farnocchia      solution date      2021-Feb-01 11:25:35   Additional Information  Earth MOID = 1.06343 au   Jupiter MOID = .480654 au   T_jup = 2.859  [ 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 9.1   0.9 K212/14 2 parameter fit from 340 observations, autocmod 2.9a comet total magnitude slope K1 15.25   n/a K212/14 autocmod 2.9a comet nuclear magnitude M2 13.8   0.9 K212/14 from 1258 observations, autocmod 2.9a comet nuclear magnitude slope K2 5.   n/a K212/14 autocmod 2.9a comet nuclear phase coefficient PC 0.03   n/a K212/14 autocmod 2.9a diameter diameter 3.42 km n/a DASTCOM value unverified 17P/Holmes          Discovered 1892-Nov-07 by Holmes, Edwin at London, England Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1993.6       1993 VII   1993i   1986.7       1986 V   1986f   1979.8       1979 IV   1979f   1972.9       1972 I   1971b   1966.0   17P/1964 O1   1964 X   1964i   1904.0       1906 III   1906f   1897.2   17P/1899 L1   1899 II   1899d   1890.3   17P/1892 V1   1892 III   1892f  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 09:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin