+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2018 B1 (Lemmon) Classification: Hyperbolic Comet          SPK-ID: 1003560 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] [ show orbit diagram ] Orbital Elements at Epoch 2458412.5 (2018-Oct-21.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.00296990247976 1.0002e-05   a -1722.857293595447 5.7993 au q 5.116718148521779 8.9742e-06 au i 162.4235687682425 1.5779e-05 deg node 133.1688342676005 0.00012333 deg peri 68.34911227383604 0.00019183 deg M .00281929417940469 1.4226e-05 deg tp 2458207.944915244706 (2018-Mar-30.44491524) 0.0012933 TDB period n/a n/a n/a n/a d yr n 1.378256709080279E-5 6.959e-08 deg/d Q n/a n/a au   Orbit Determination Parameters    # obs. used (total)      312      data-arc span      1018 days (2.79 yr)      first obs. used      2017-01-16      last obs. used      2019-10-31      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      norm. resid. RMS      .53726      source      ORB      producer      Otto Matic      solution date      2021-May-02 23:42:38   Additional Information  Earth MOID = 4.17906 au   Jupiter MOID = .97494 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 12.3   0.6 16 2 parameter fit from 269 observations, autocmod 2.9c comet total magnitude slope K1 4.5   n/a 16 autocmod 2.9c [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] 2021-May-08 08:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin