+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   C/2013 A1 (Siding Spring) Classification: Hyperbolic Comet          SPK-ID: 1003228 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456337.5 (2013-Feb-14.0) TDB Reference: JPL 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.000389011004452 5.2576e-05   a -3597.73862629926 486.5 AU q 1.399559916772394 0.0001233 AU i 129.02294439 0.0011502 deg node 300.9660044529178 0.0021355 deg peri 2.430348539797453 0.0019691 deg M 359.9971749689301 0.00057282 deg tp 2456956.033986936096 (2014-Oct-25.53398694) 0.044699 JED period n/a n/a n/a n/a d yr n 4.567301279439201E-6 9.2641e-07 deg/d Q n/a n/a AU   Orbit Determination Parameters    # obs. used (total)      280      data-arc span      211 days      first obs. used      2012-10-04      last obs. used      2013-05-03      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      fit RMS      .38054      data source      ORB      producer      Otto Matic      solution date      2013-May-07 16:13:17   Additional Information  Earth MOID = .383062 AU   T_jup = -0.919  [ 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 5.2 mag 0.4 15 from 97 observations, assumed slope, autocmod 2.5c comet total magnitude slope K1 11.   n/a 15 autocmod 2.5c comet nuclear magnitude M2 10.5 mag 0.5 15 from 156 observations, autocmod 2.5c comet nuclear magnitude slope K2 5.   n/a 15 autocmod 2.5c comet nuclear phase coefficient PC 0.03   n/a 15 autocmod 2.5c [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (AU) Minimum Distance (AU) Maximum Distance (AU) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2014-Oct-19 18:45 00:37 Mars 0.000792237423254806 0.000209526377789395 0.00176642528733617 55.9642504458628 55.9577929434032 2456950.281380226 37.3326177594352 48725.768813439 5965.16771895674 -10.1642905472777 3.76742231603789 T 15 CATAB v2.0c-linF95 2013-May-07 16:13:18 2013-May-07 16:13 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-May-20 20:56 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin