+ 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 | Mission Design | Physical Parameters ] [ show orbit diagram ] Orbital Elements at Epoch 2458393.5 (2018-Oct-02.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.002991467621466 1.0239e-05   a -1710.444843568408 5.8518 au q 5.116740367838301 9.1169e-06 au i 162.4235729580755 1.6101e-05 deg node 133.1680602301745 0.00013021 deg peri 68.34969068315887 0.00019884 deg M .002585153247590205 1.3258e-05 deg tp 2458207.956463362069 (2018-Mar-30.45646336) 0.0013297 TDB period n/a n/a n/a n/a d yr n 1.393286607786756E-5 7.1501e-08 deg/d Q n/a n/a au   Orbit Determination Parameters    # obs. used (total)      297      data-arc span      1018 days (2.79 yr)      first obs. used      2017-01-16      last obs. used      2019-10-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      norm. resid. RMS      .53517      source      ORB      producer      Otto Matic      solution date      2019-Dec-08 14:18:20   Additional Information  Earth MOID = 4.17852 au   Jupiter MOID = .975011 au  [ 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 9.7   0.7 13 from 254 observations, assumed slope, autocmod 2.8 comet total magnitude slope K1 8.   n/a 13 autocmod 2.8 comet nuclear magnitude M2 11.5   0.5 13 from 18 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 13 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 13 autocmod 2.8 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ] 2021-Feb-27 22:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin