+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   88P/Howell Classification: Jupiter-family Comet          SPK-ID: 1000046 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2016-Jan-21.0] K203/14 (default) [epoch=2007-Nov-08.0] K092/1 [epoch=2002-Dec-30.0] K042/1 [epoch=1997-May-03.0] J982/1 [epoch=1993-Feb-22.0] SAO/1993 [epoch=1990-Mar-22.0] J937/8 [epoch=1987-Mar-26.0] SAO/1987 [epoch=1955-Oct-20.0] SAO/1955 Orbital Elements at Epoch 2457408.5 (2016-Jan-21.0) TDB Reference: JPL K203/14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5630745112078982 4.5186e-08   a 3.10882988507007 6.481e-08 au q 1.358327017105734 1.643e-07 au i 4.382957683372297 8.7788e-06 deg node 56.69768323440714 8.3881e-05 deg peri 235.8993210774943 8.5176e-05 deg M 52.10488566886495 1.1277e-05 deg tp 2457118.719064191099 (2015-Apr-06.21906419) 6.9056e-05 TDB period 2002.137334187473 5.48 6.2608e-05 1.714e-07 d yr n .1798078452725615 5.6227e-09 deg/d Q 4.859332753034406 1.013e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 8.033492841311949E-9 3.992E-11 A2 [EST] -7.274216513493459E-10 8.659E-12 A3 [EST] -6.437643760745283E-10 2.187E-11 DT [EST] 35.76299289646545 .4866   Orbit Determination Parameters    # obs. used (total)      3399      data-arc span      4408 days (12.07 yr)      first obs. used      2008-12-30      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .60787      source      ORB      producer      Davide Farnocchia      solution date      2021-Feb-01 11:45:56   Additional Information  Earth MOID = .351066 au   Jupiter MOID = .464699 au   T_jup = 2.948  [ 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 12.0   1. K203/14 2 parameter fit from 1466 observations, autocmod 2.9a comet total magnitude slope K1 9.5   n/a K203/14 autocmod 2.9a diameter diameter 4.4 km n/a Scotti,J (1994) BAAS 26:1375   88P/Howell          Discovered 1981-Aug-29 by Howell, Ellen at Palomar Mountain Observatory, California discovered on plate/photo taken on discovery date as well as 8/30 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1993.3       1993 II   1992c   1987.9   88P/1987 E1   1987 VI   1987h   1982.4   88P/1981 Q1   1981 X   1981k  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 11:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin