+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   50P/Arend Classification: Jupiter-family Comet          SPK-ID: 1000001 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2009-03-01.0] 42 (default) [epoch=1999-08-10.0] SAO/1999 [epoch=1991-05-24.0] SAO/1991 [epoch=1983-05-26.0] SAO/1983 [epoch=1975-05-28.0] SAO/1975 [epoch=1967-05-30.0] SAO/1967 [epoch=1959-08-20.0] SAO/1959 [epoch=1951-11-10.0] SAO/1951 Orbital Elements at Epoch 2454891.5 (2009-Mar-01.0) TDB Reference: JPL 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.5294720134830936952852 2.1121e-07   a 4.0884590329145389375753 2.1323e-07 AU q 1.9237343967141360412398 9.0424e-07 AU i 19.158363566038730141372 1.1562e-05 deg node 355.3246436489589 3.7853e-05 deg peri 49.03440507779702 0.0001192 deg M 57.91719917293964 2.6431e-05 deg tp 2454405.716283330827 (2007-Nov-01.21628333) 0.00022749 JED period 3019.519943958402 8.27 0.00023622 6.467e-07 d yr n .1192242497753012 9.3271e-09 deg/d Q 6.253183669114942 3.2613e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -6.025689626519869E-10 2.983E-10 A2 [EST] -1.655108847929911E-10 1.909E-12   Orbit Determination Parameters    # obs. used (total)      1113      data-arc span      15168 days (41.53 yr)      first obs. used      1967-09-08      last obs. used      2009-03-19      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .70395      data source      ORB      producer      Nick Mastrodemos      solution date      2009-Apr-02 17:15:03   Additional Information  Earth MOID = .981863 AU   T_jup = 2.693  [ 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 12.1 mag 1. 42 from 194 observations, assumed slope, autocmod 2.4a comet total magnitude slope K1 14.   n/a 42 autocmod 2.4a comet nuclear magnitude M2 15.5 mag 0.6 42 from 816 observations, autocmod 2.4a comet nuclear magnitude slope K2 5.   n/a 42 autocmod 2.4a comet nuclear phase coefficient PC 0.03   n/a 42 autocmod 2.4a 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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-22 15:50 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin