+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2021 A1 (Leonard) Classification: Hyperbolic Comet          SPK-ID: 1003751 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459188.5 (2020-Dec-05.0) TDB Reference: JPL 2 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.000065462360191 2.4005e-05   a -9393.433680048678 3444.6 au q .6149163389936573 9.9534e-06 au i 132.6858531465356 0.00012134 deg node 255.8710670332267 0.0011721 deg peri 225.089790258256 0.0013877 deg M -.0004268532659132481 0.00023477 deg tp 2459582.785762318993 (2022-Jan-03.28576232) 0.017007 TDB period n/a n/a n/a n/a d yr n 1.082598730937453E-6 5.9548e-07 deg/d Q n/a n/a au   Orbit Determination Parameters    # obs. used (total)      187      data-arc span      290 days      first obs. used      2020-04-11      last obs. used      2021-01-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      norm. resid. RMS      .4792      source      ORB      producer      Otto Matic      solution date      2021-Jan-30 21:12:52   Additional Information  Earth MOID = .230923 au   Jupiter MOID = .296891 au  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 5.3   0.4 2 2 parameter fit from 163 observations, autocmod 2.8 comet total magnitude slope K1 14.75   n/a 2 autocmod 2.8 [ 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 2021-Dec-12 14:03 00:47 Earth 0.233349960354012 0.233260776066499 0.233439813142883 70.6684142216563 70.6682526445687 2459561.085350238 46.8980055178401 21278.9609755935 1438.72196450003 -78.5190845087596 23722.2185342579 T 2 CATAB v2.0f-lin.ifort 2021-Jan-30 21:12:52 2021-Jan-30 21:12 2021-Dec-18 02:17 00:42 Venus 0.0284080723747731 0.0279129908016131 0.0289031744146719 78.2297570728234 78.2287799303063 2459566.595201707 42.0249715327075 24717.586890054 1416.78493415125 2.79738596327155 222.824133295741 T 2 CATAB v2.0f-lin.ifort 2021-Jan-30 21:12:52 2021-Jan-30 21:12 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-02 16:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin