+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   C/1980 E1 (Bowell) Classification: Hyperbolic Comet          SPK-ID: 1000541 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2445006.5 (1982-Feb-06.0) TDB Reference: JPL 4 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.057500018172446 3.8576e-06   a -58.50332643008967 0.0039238 AU q 3.363942332878702 1.5498e-06 AU i 1.661728381407551 3.1604e-05 deg node 114.5562837688936 0.0010901 deg peri 135.084519228386 0.0010912 deg M 359.9244727453218 7.7167e-06 deg tp 2445040.790235311597 (1982-Mar-12.29023531) 0.00034284 JED period n/a n/a n/a n/a d yr n .002202587821047491 2.2159e-07 deg/d Q n/a n/a AU   Orbit Determination Parameters    # obs. used (total)      174      data-arc span      2514 days (6.88 yr)      first obs. used      1980-02-11      last obs. used      1986-12-30      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      fit RMS      .9624      data source      ORB      producer      Otto Matic      solution date      2011-Sep-14 21:14:12   Additional Information  Earth MOID = 2.35163 AU  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 6.0 mag 1. 4 2 parameter fit from 34 observations, autocmod 2.5a comet total magnitude slope K1 7.   n/a 4 autocmod 2.5a [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-May-24 23:00 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin