+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   73P/Schwassmann-Wachmann 3-AR Classification: Jupiter-family Comet [NEO]          SPK-ID: 1002367 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2453839.5 (2006-Apr-14.0) TDB Reference: JPL 2 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.695799013016798 0.0053291   a 3.08744810378797 0.053485 au q 0.939204760431714 0.00018886 au i 11.406522554195 0.042012 deg node 69.96630167530681 0.081257 deg peri 198.7098465902828 0.07789 deg M 350.2237117938292 0.2635 deg tp 2453893.310796666163 (2006-Jun-06.81079667) 0.052132 TDB period 1981.517564876132 5.43 51.489 0.141 d yr n .1816789345606958 0.0047209 deg/d Q 5.235691447144216 0.090699 au   Orbit Determination Parameters    # obs. used (total)      15      data-arc span      14 days      first obs. used      2006-04-07      last obs. used      2006-04-21      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      9      norm. resid. RMS      .80648      source      ORB      producer      Nick Mastrodemos      solution date      2006-Apr-30 18:51:30   Additional Information  Earth MOID = .040648 au   T_jup = 2.770  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 21.8   0.6 1 from 4 observations comet total magnitude slope K1 20.0   n/a 1 from 4 observations [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-20 09:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin