+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2019 Y4-D (ATLAS) Classification: Halley-type Comet* [NEO]          SPK-ID: 1003675 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] [ show orbit diagram ] Orbital Elements at Epoch 2458953.5 (2020-Apr-14.0) TDB Reference: JPL 7 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .9898679875903229 0.0046785   a 25.09303807032235 11.388 au q .2542429731250058 0.0020356 au i 44.95467243950517 0.49347 deg node 120.6559390884409 0.27222 deg peri 177.7425034424157 0.23542 deg M 359.630362575582 0.25181 deg tp 2459000.641319005360 (2020-May-31.14131901) 0.023756 TDB period 45912.22024839774 125.70 31255 85.57 d yr n .007841049682465823 0.0053378 deg/d Q 49.9318331675197 22.661 au   Orbit Determination Parameters    # obs. used (total)      74      data-arc span      8 days      first obs. used      2020-04-09      last obs. used      2020-04-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      9      norm. resid. RMS      .89276      source      ORB      producer      Davide Farnocchia      solution date      2020-Jun-17 10:04:16   Additional Information  Earth MOID = .626411 au   Jupiter MOID = 1.32993 au   T_jup = 0.649  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.3   1. 7 2 parameter fit from 48 observations, autocmod 2.8 comet total magnitude slope K1 4.5   n/a 7 autocmod 2.8 comet nuclear magnitude M2 15.5   0.3 7 from 17 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 7 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 7 autocmod 2.8 Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2020.4   C/2019 Y4-D        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] 2020-Sep-21 03:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin