+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   C/1956 R1 (Arend-Roland) Classification: Hyperbolic Comet          SPK-ID: 1001097 [ Ephemeris | Orbit Diagram | Orbital Elements ] [ show orbit diagram ] Orbital Elements at Epoch 2436061.5 (1957-Aug-11.0) TDB Reference: JPL 2 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.000244404339448 1.2903e-06   a -1293.110404906218 6.83 AU q .3160417943445133 9.7768e-07 AU i 119.9444682711771 4.571e-05 deg node 215.8558693676092 9.4523e-05 deg peri 308.7747071806902 6.5441e-05 deg M .002648804440190908 2.0985e-05 deg tp 2435936.531881497852 (1957-Apr-08.03188150) 5.6069e-05 JED period n/a n/a n/a n/a d yr n 2.119584156294534E-5 1.6793e-07 deg/d Q n/a n/a AU   Orbit Determination Parameters    # obs. used (total)      48      data-arc span      497 days (1.36 yr)      first obs. used      1956-11-30      last obs. used      1958-04-11      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      fit RMS      1.2997      data source      ORB      producer      Otto Matic      solution date      2011-Sep-14 21:14:02   Additional Information  Earth MOID = .238579 AU  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements ] no physical parameters available [ Ephemeris | Orbit Diagram | Orbital Elements ] 2013-Jun-19 18:53 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin