+ 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 2456134.5 (2012-Jul-26.0) TDB Reference: JPL 47 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4730229634679645 2.1602e-07   a 3.670265316249794 3.6176e-08 au q 1.93414553964363 7.9129e-07 au i 10.97467282437022 2.3677e-05 deg node 103.573686092311 3.2733e-05 deg peri 296.926775855707 6.7205e-05 deg M 309.2613677481978 2.4131e-05 deg tp 2456496.476912601373 (2013-Jul-22.97691260) 0.00016983 TDB period 2568.293285672192 7.03 3.7971e-05 1.04e-07 d yr n .1401709072746255 2.0724e-09 deg/d Q 5.406385092855957 5.3288e-08 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -1.668229293726916E-10 1.579E-12   Orbit Determination Parameters    # obs. used (total)      989      data-arc span      7775 days (21.29 yr)      first obs. used      1999-10-10      last obs. used      2021-01-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .80755      source      ORB      producer      Otto Matic      solution date      2021-Jan-30 21:13:01   Additional Information  Earth MOID = .971304 au   Jupiter MOID = .654727 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 47 2 parameter fit from 560 observations, autocmod 2.8 comet total magnitude slope K1 10.   n/a 47 autocmod 2.8 comet nuclear magnitude M2 15.9   0.7 47 from 364 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 47 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 47 autocmod 2.8 [ 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-Mar-05 11:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin