+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   47P/Ashbrook-Jackson Classification: Jupiter-family Comet          SPK-ID: 1000003 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2017-Nov-21.0] K171/11 (default) [epoch=2008-Mar-14.0] K132/1 [epoch=2001-Jan-11.0] SAO/2001 [epoch=1993-Aug-01.0] SAO/1993 [epoch=1986-Jan-10.0] SAO/1986 [epoch=1978-Jul-31.0] SAO/1978 [epoch=1971-Mar-30.0] SAO/1971 [epoch=1963-Oct-18.0] SAO/1963 [epoch=1956-Mar-28.0] SAO/1956 [epoch=1948-Oct-16.0] SAO/1948 Orbital Elements at Epoch 2458078.5 (2017-Nov-21.0) TDB Reference: JPL K171/11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3171758541205694 1.7779e-06   a 4.127314613480848 1.5554e-05 au q 2.818230075725752 3.5068e-06 au i 13.02970813091557 2.0243e-05 deg node 356.9738562710257 5.1235e-05 deg peri 357.662099073663 0.00022351 deg M 19.26031513082375 0.00020502 deg tp 2457914.644630568541 (2017-Jun-10.14463057) 0.00084316 TDB period 3062.667074482201 8.39 0.017313 4.74e-05 d yr n .1175446077699661 6.6447e-07 deg/d Q 5.436399151235943 2.0488e-05 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -1.86868699386034E-8 1.049E-9 A2 [EST] -1.326568354101431E-9 1.797E-10 A3 [EST] 9.04539017500324E-10 1.715E-10 ALN [SET] .0408373333128795 n/a NK [SET] 2.6 n/a NM [SET] 2. n/a NN [SET] 3. n/a R0 [SET] 5. n/a   Orbit Determination Parameters    # obs. used (total)      1108      data-arc span      2480 days (6.79 yr)      first obs. used      2014-04-05      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      3      norm. resid. RMS      .53483      source      ORB      producer      Javier Roa      solution date      2021-Feb-03 22:16:53   Additional Information  Earth MOID = 1.81255 au   Jupiter MOID = .00398759 au   T_jup = 2.906   Nongrav. accels. using CO driven g(r)  [ 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 13.0   1. K171/11 2 parameter fit from 375 observations, autocmod 2.8 comet total magnitude slope K1 5.5   n/a K171/11 autocmod 2.8 diameter diameter 5.6 km n/a Lamy,P.L.;Toth,I.;Fernandez,Y.R.;Weaver,H.A. (2004) Comets II, pp. 223-264   rotation period rot_per 15.6 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Kokotankekova, R.; Snodgrass, C.; Lacerda, P.; Green S.F.; et al. (2017) Mon. Not. Royal Ast. Soc. 471, 2974-3007.] 47P/Ashbrook-Jackson          Discovered 1948-Aug-26 by Ashbrook, Joseph at Lowell Observatory, Arizona discovered on plate/photo taken on discovery date Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1992.3       1993 XIII   1992j   1983.9       1986 II   1985a   1975.5       1978 XIV   1977g   1967.1       1971 III   1970e   1958.7   47P/1955 H1   1956 II   1962e   1950.4   47P/1948 Q1   1948 IX   1948i  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 10:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin