+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   50P/Arend Classification: Jupiter-family Comet          SPK-ID: 1000001 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2009-Dec-25.0] K163/2 (default) [epoch=1999-Aug-10.0] SAO/1999 [epoch=1996-Aug-03.0] J997/1 [epoch=1991-May-24.0] SAO/1991 [epoch=1983-May-26.0] SAO/1983 [epoch=1975-May-28.0] SAO/1975 [epoch=1967-May-30.0] SAO/1967 [epoch=1959-Aug-20.0] SAO/1959 [epoch=1951-Nov-10.0] SAO/1951 Orbital Elements at Epoch 2455190.5 (2009-Dec-25.0) TDB Reference: JPL K163/2 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5298191651919552 1.5246e-07   a 4.088133046971167 8.8019e-08 au q 1.922161808831259 6.5786e-07 au i 19.16230981680282 8.9773e-06 deg node 355.3247745531997 2.2956e-05 deg peri 49.01451533157994 5.9249e-05 deg M 93.54698610299745 1.555e-05 deg tp 2454405.963311358784 (2007-Nov-01.46331136) 0.00012386 TDB period 3019.158817151758 8.27 9.7505e-05 2.67e-07 d yr n .1192385103939713 3.8509e-09 deg/d Q 6.254104285111073 1.3465e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 2.365273031799187E-9 2.887E-10 A2 [EST] -1.107871065975338E-10 2.867E-12   Orbit Determination Parameters    # obs. used (total)      1693      data-arc span      6447 days (17.65 yr)      first obs. used      1999-08-03      last obs. used      2017-03-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .68498      source      ORB      producer      Davide Farnocchia      solution date      2017-May-08 08:57:20   Additional Information  Earth MOID = .981081 au   Jupiter MOID = .603459 au   T_jup = 2.693  [ 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 14.1   0.8 K163/2 2 parameter fit from 402 observations, autocmod 2.6i comet total magnitude slope K1 8.   n/a K163/2 autocmod 2.6i diameter diameter 1.9 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H. (to be published)   50P/Arend          Discovered 1951-Oct-04 by Arend, Silvio at Royal Observatory, Uccle, Belgium 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   1991.3       1991 VIII   1991u   1983.0       1983 VIII   1983q   1974.8       1975 VI   1975m   1966.5       1967 VI   1967l   1958.2   50P/1959 N1   1959 V   1959c   1950.0   50P/1951 T1   1951 X   1951j  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 11:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin