+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   366P/Spacewatch Classification: Encke-type Comet          SPK-ID: 1002439 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455320.5 (2010-May-04.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3473441669301122 1.517e-05   a 3.501073125891587 5.3607e-07 au q 2.28499579761737 5.3358e-05 au i 8.853805178127358 0.00010949 deg node 70.79714491950133 0.00054186 deg peri 153.5760441370972 0.0052526 deg M 268.0074617731242 0.0020264 deg tp 2455931.935007939145 (2012-Jan-05.43500794) 0.013461 TDB period 2392.76583841215 6.55 0.00054956 1.505e-06 d yr n .1504535020605684 3.4556e-08 deg/d Q 4.717150454165805 7.2228e-07 au   Orbit Determination Parameters    # obs. used (total)      76      data-arc span      4764 days (13.04 yr)      first obs. used      2005-04-04      last obs. used      2018-04-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .75881      source      ORB      producer      Otto Matic      solution date      2019-Dec-03 20:52:19   Additional Information  Earth MOID = 1.27982 au   Jupiter MOID = .34093 au   T_jup = 3.006  [ 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 13.2   0.6 20 2 parameter fit from 31 observations, autocmod 2.8 comet total magnitude slope K1 17.   n/a 20 autocmod 2.8 comet nuclear magnitude M2 17.6   0.7 20 from 37 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 20 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 20 autocmod 2.8 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2018.6   366P/2018 F2         2005.5   366P/2005 JN        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-07 09:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin