+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   73P/Schwassmann-Wachmann 3-BC Classification: Jupiter-family Comet [NEO]          SPK-ID: 1002378 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2453856.5 (2006-May-01.0) TDB Reference: JPL 7 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.700467515087574 0.0035149   a 3.13424236839265 0.036175 au q 0.938807404922457 0.00018109 au i 11.4587061463897 0.031602 deg node 69.95554650558832 0.03058 deg peri 198.7461327274749 0.0225 deg M 353.497734320052 0.11842 deg tp 2453893.106609153108 (2006-Jun-06.60660915) 0.032918 TDB period 2026.736516743531 5.55 35.088 0.09607 d yr n .1776254569974551 0.0030752 deg/d Q 5.329677331862838 0.061514 au   Orbit Determination Parameters    # obs. used (total)      63      data-arc span      11 days      first obs. used      2006-04-25      last obs. used      2006-05-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      8      norm. resid. RMS      1.0915      source      ORB      producer      Nick Mastrodemos      solution date      2006-Aug-22 15:26:17   Additional Information  Earth MOID = .0409545 au   T_jup = 2.746  [ 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 19.8   0.8 3 2 parameter fit from 18 observations comet total magnitude slope K1 50.0   n/a 3 2 parameter fit from 18 observations comet nuclear magnitude M2 20.1   0.3 3 from 7 observations comet nuclear magnitude slope K2 5.0   n/a 3 from 7 observations [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 23:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin