+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   73P/Schwassmann-Wachmann 3-AK Classification: Jupiter-family Comet [NEO]          SPK-ID: 1002359 [ 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 3 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.69335823324 0.094267   a 3.05798267872401 0.93542 au q 0.937705211325409 0.0050904 au i 11.4294972671815 0.70576 deg node 69.37619102093456 2.5245 deg peri 199.3256981265443 2.7163 deg M 349.792353539475 4.8169 deg tp 2453894.882694033521 (2006-Jun-08.38269403) 0.7238 TDB period 1953.219082299802 5.35 896.21 2.454 d yr n .1843111217079248 0.084569 deg/d Q 5.178260146122617 1.584 au   Orbit Determination Parameters    # obs. used (total)      12      data-arc span      11 days      first obs. used      2006-04-08      last obs. used      2006-04-19      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      9      norm. resid. RMS      .65184      source      ORB      producer      Nick Mastrodemos      solution date      2006-Apr-30 16:33:57   Additional Information  Earth MOID = .0403185 au   T_jup = 2.784  [ 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 18.8   0.7 1 from 3 observations comet total magnitude slope K1 30.0   n/a 1 from 3 observations [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-17 22:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin