+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2010 X1 (Elenin) Classification: Hyperbolic Comet          SPK-ID: 1003113 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455651.5 (2011-Mar-31.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.000068095226441 1.8496e-06   a -7084.513117079299 192.42 au q .4824215249311249 2.6549e-06 au i 1.83957593943795 4.5064e-05 deg node 323.235099758002 0.00089743 deg peri 343.798053273921 0.00089506 deg M -.0002706073326346699 1.1025e-05 deg tp 2455815.219533945734 (2011-Sep-10.71953395) 0.00036038 TDB period n/a n/a n/a n/a d yr n 1.652871383840884E-6 6.7341e-08 deg/d Q n/a n/a au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -4.490851666247193E-8 1.175E-8 A2 [EST] 6.163129316527091E-8 7.965E-9   Orbit Determination Parameters    # obs. used (total)      2235      data-arc span      271 days      first obs. used      2010-12-10      last obs. used      2011-09-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      norm. resid. RMS      .59542      source      ORB      producer      Shantanu Naidu      solution date      2018-Aug-29 15:52:04   Additional Information  Earth MOID = .0306308 au   Jupiter MOID = .148357 au   T_jup = 0.861  [ 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 10.4   0.9 38 from 354 observations, assumed slope, autocmod 2.6n comet total magnitude slope K1 11.   n/a 38 autocmod 2.6n comet nuclear magnitude M2 13.7   0.8 38 from 1786 observations, autocmod 2.6n comet nuclear magnitude slope K2 5.   n/a 38 autocmod 2.6n comet nuclear phase coefficient PC 0.03   n/a 38 autocmod 2.6n [ 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 2011-Oct-16 19:10 00:08 Earth 0.233334382571762 0.23326738037053 0.233401384919914 23.9495465714043 23.9490697665743 2455851.298337481 7.841348647158 3354.11942048839 471.561124188526 5.05143099389387 17747.2924060261 T 38 CATAB v2.0e-lin.ifort 2018-Aug-29 15:52:01 2018-Aug-29 15:52 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2021-Jan-19 06:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin