+ 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 2454771.5 (2008-Nov-01.0) TDB Reference: JPL 56 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3085334564082223 1.0869e-07   a 4.497391555756662 1.1919e-07 au q 3.109795794237907 5.0594e-07 au i 9.872747387725829 1.2055e-05 deg node 91.96245781921567 7.139e-05 deg peri 163.9054241226952 7.9097e-05 deg M 220.9349907587471 2.2327e-05 deg tp 2456117.220428790780 (2012-Jul-08.72042879) 0.00020831 TDB period 3483.689800963738 9.54 0.00013849 3.792e-07 d yr n .1033387071088846 4.1081e-09 deg/d Q 5.884987317275417 1.5597e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 7.535816712762799E-8 7.88E-9 A2 [EST] 3.690213508917659E-8 4.675E-10   Orbit Determination Parameters    # obs. used (total)      670      data-arc span      9833 days (26.92 yr)      first obs. used      1993-04-21      last obs. used      2020-03-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .78883      source      ORB      producer      Otto Matic      solution date      2020-Apr-06 08:43:18   Additional Information  Earth MOID = 2.09496 au   Jupiter MOID = .340517 au   T_jup = 2.899  [ 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 10.8   1. 56 2 parameter fit from 356 observations, autocmod 2.8 comet total magnitude slope K1 9.25   n/a 56 autocmod 2.8 [ 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-Jan-17 20:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin