+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   178P/Hug-Bell Classification: Jupiter-family Comet          SPK-ID: 1000283 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456251.5 (2012-Nov-20.0) TDB Reference: JPL 50 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4729919523404931 2.1531e-07   a 3.669474902953501 3.5529e-08 au q 1.933842804541083 7.8843e-07 au i 10.97529382676345 2.2891e-05 deg node 103.5748531955486 3.1647e-05 deg peri 296.9463255581147 6.6558e-05 deg M 325.6448200596468 2.3795e-05 deg tp 2456496.515769102927 (2013-Jul-23.01576910) 0.00016821 TDB period 2567.463684666904 7.03 3.7289e-05 1.021e-07 d yr n .1402161994149902 2.0365e-09 deg/d Q 5.405107001365918 5.2335e-08 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -1.665194402580553E-10 1.566E-12   Orbit Determination Parameters    # obs. used (total)      1034      data-arc span      7829 days (21.43 yr)      first obs. used      1999-10-10      last obs. used      2021-03-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .79645      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 23:27:46   Additional Information  Earth MOID = .970627 au   Jupiter MOID = .655065 au   T_jup = 2.871  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.6   0.6 50 2 parameter fit from 602 observations, autocmod 2.9c comet total magnitude slope K1 10.   n/a 50 autocmod 2.9c comet nuclear magnitude M2 15.9   0.7 50 from 364 observations, autocmod 2.9c comet nuclear magnitude slope K2 5.   n/a 50 autocmod 2.9c comet nuclear phase coefficient PC 0.03   n/a 50 autocmod 2.9c [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2006.5   178P/2006 O1         1999.5   178P/1999 X1        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-18 13:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin