+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   73P/Schwassmann-Wachmann 3-AT Classification: Jupiter-family Comet [NEO]          SPK-ID: 1002369 [ 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 0.686932227480063 0.0023875   a 3.00135904388845 0.022557 au q 0.939628790402723 0.00010463 au i 11.3346206138147 0.019971 deg node 69.84813048476539 0.028572 deg peri 198.8104065064084 0.025051 deg M 349.8990536028593 0.11848 deg tp 2453892.788674827537 (2006-Jun-06.28867483) 0.024337 TDB period 1899.220348634239 5.20 21.41 0.05862 d yr n .1895514652941045 0.0021369 deg/d Q 5.063089297374168 0.038052 au   Orbit Determination Parameters    # obs. used (total)      25      data-arc span      21 days      first obs. used      2006-04-07      last obs. used      2006-04-28      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      8      norm. resid. RMS      .75728      source      ORB      producer      Nick Mastrodemos      solution date      2006-Apr-30 19:00:55   Additional Information  Earth MOID = .0402083 au   T_jup = 2.816  [ 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 21.0   0.5 1 from 9 observations comet total magnitude slope K1 10.0   n/a 1 from 9 observations [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 21:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin