+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   105P/Singer Brewster Classification: Jupiter-family Comet          SPK-ID: 1000086 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2013-03-13.0] 36 (default) [epoch=1999-04-12.0] SAO/1999 [epoch=1992-10-25.0] SAO/1992 [epoch=1986-06-19.0] SAO/1986 Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4090801715603757 3.1001e-07   a 3.47004826613181 2.7483e-07 AU q 2.050520326099825 9.4754e-07 AU i 9.170894334227624 2.3131e-05 deg node 192.4125590772428 0.00013297 deg peri 46.63529856040196 0.00014286 deg M 58.08508238263528 6.1339e-05 deg tp 2455983.553656697598 (2012-Feb-26.05365670) 0.00038525 JED period 2361.031059325197 6.46 0.00028049 7.679e-07 d yr n .1524757578169645 1.8114e-08 deg/d Q 4.889576206163795 3.8725e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 2.625617974678633E-9 1.332E-10 A2 [EST] -2.244252852679116E-10 4.274E-11 A3 [EST] -1.164257417871125E-9 1.437E-10 DT [EST] -120.6821975006365 13.62   Orbit Determination Parameters    # obs. used (total)      333      data-arc span      9684 days (26.51 yr)      first obs. used      1986-05-03      last obs. used      2012-11-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .82437      data source      ORB      producer      Ryan S. Park      solution date      2013-Mar-03 19:26:47   Additional Information  Earth MOID = 1.05143 AU   T_jup = 2.971  [ 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 12.6 mag 1. 36 from 151 observations, assumed slope, autocmod 2.5b comet total magnitude slope K1 13.   n/a 36 autocmod 2.5b comet nuclear magnitude M2 16.3 mag 0.9 36 from 103 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a 36 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a 36 autocmod 2.5b diameter diameter 2.2 km n/a Scotti,J (1994) BAAS 26:1375   105P/Singer Brewster          Discovered 1986-May-03 by Singer-Brewster, Stephen at Palomar Mountain Observatory, California (675) discovered on plate/photo taken on discovery date as well as 5/4 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1992.8   105P/1992 G1   1992 XXVI   1992e   1986.3   105P/1986 J1   1986 XI   1986d  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-23 16:33 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin