+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2019 L2 (NEOWISE) Classification: Halley-type Comet*          SPK-ID: 1003630 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ] [ show orbit diagram ] Orbital Elements at Epoch 2458655.5 (2019-Jun-21.0) TDB Reference: JPL 5 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9367514145823834 0.0027429   a 25.63744491913123 1.1402 au q 1.621532124857112 0.0017995 au i 152.1873028226871 0.0055174 deg node 12.53386626090697 0.008468 deg peri 18.81569090590202 0.14753 deg M .6067943449730322 0.042159 deg tp 2458575.581088287643 (2019-Apr-02.08108829) 0.22129 TDB period 47414.43036639898 129.81 3163.1 8.66 d yr n .007592625224389912 0.00050652 deg/d Q 49.65335771340536 2.2083 au   Orbit Determination Parameters    # obs. used (total)      117      data-arc span      19 days      first obs. used      2019-06-11      last obs. used      2019-06-30      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      7      norm. resid. RMS      .67037      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 23:33:56   Additional Information  Earth MOID = .636695 au   Jupiter MOID = 1.69954 au   T_jup = -1.171  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 10.4   0.7 5 2 parameter fit from 95 observations, autocmod 2.9c comet total magnitude slope K1 27.75   n/a 5 autocmod 2.9c Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2019.2   C/2019 L2        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ] 2021-Apr-22 17:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin