+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2019 Q4 (Borisov) Classification: Hyperbolic Comet          SPK-ID: 1003639 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] [ show orbit diagram ] Orbital Elements at Epoch 2459062.5 (2020-Aug-01.0) TDB Reference: JPL 53 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 3.356215101434632 1.2419e-05   a -.8516123560275226 6.4703e-06 au q 2.006581893840375 5.1673e-06 au i 44.05257068647377 6.1532e-06 deg node 308.1487262895379 4.3381e-05 deg peri 209.12367864 0.00011673 deg M 296.5442557294122 0.0030871 deg tp 2458826.045070213072 (2019-Dec-08.54507021) 0.00025087 TDB period n/a n/a n/a n/a d yr n 1.25412591734345 1.4293e-05 deg/d Q n/a n/a au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 7.093444133467172E-8 7.611E-9 A2 [EST] -1.4438115056624E-8 2.721E-9 A3 [EST] 6.53473450694026E-10 1.367E-9 DT [EST] 87.29159436127772 4.648   Orbit Determination Parameters    # obs. used (total)      1428      data-arc span      311 days      first obs. used      2019-08-30      last obs. used      2020-07-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      norm. resid. RMS      .47851      source      ORB      producer      Davide Farnocchia      solution date      2020-Aug-21 09:32:58   Additional Information  Earth MOID = 1.0939 au   Jupiter MOID = 2.38873 au  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.7   0.8 53 2 parameter fit from 2269 observations, autocmod 2.8 comet total magnitude slope K1 4.5   n/a 53 autocmod 2.8 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] 2021-Mar-03 03:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin