+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   152P/Helin-Lawrence Classification: Jupiter-family Comet          SPK-ID: 1000145 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455022.5 (2009-Jul-10.0) TDB Reference: JPL 60 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3082627744445086 1.0649e-07   a 4.497815029541231 8.9706e-08 au q 3.111306089596642 5.0378e-07 au i 9.870826456722094 1.1514e-05 deg node 91.959319552 7.1196e-05 deg peri 163.9173475991133 7.8837e-05 deg M 246.8326260213012 2.1813e-05 deg tp 2456117.765861733523 (2012-Jul-09.26586173) 0.00020841 TDB period 3484.181848191383 9.54 0.00010423 2.854e-07 d yr n .1033241132884249 3.0911e-09 deg/d Q 5.88432396948582 1.1736e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 8.686584565358988E-8 7.779E-9 A2 [EST] 3.384785842819168E-8 2.785E-10   Orbit Determination Parameters    # obs. used (total)      711      data-arc span      10198 days (27.92 yr)      first obs. used      1993-04-21      last obs. used      2021-03-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .81243      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 23:27:41   Additional Information  Earth MOID = 2.09812 au   Jupiter MOID = .340589 au   T_jup = 2.900  [ 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 10.9   1. 60 2 parameter fit from 396 observations, autocmod 2.9c comet total magnitude slope K1 9.25   n/a 60 autocmod 2.9c [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2003.0   152P/2001 Y1         1993.4   152P/1993 K2   1993 XI   1993l  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Apr-23 15:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin