+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   242P/Spahr Classification: Jupiter-family Comet          SPK-ID: 1000236 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455399.5 (2010-Jul-22.0) TDB Reference: JPL 88 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3141568505569534 2.3865e-07   a 5.64537572827304 4.1898e-07 au q 3.871842269268114 1.156e-06 au i 32.14612402067504 1.511e-05 deg node 181.1266510593627 3.3609e-05 deg peri 250.5862770615376 9.0121e-05 deg M 313.7460807304692 4.1028e-05 deg tp 2456028.982617062851 (2012-Apr-11.48261706) 0.00053691 TDB period 4899.341411959123 13.41 0.00054542 1.493e-06 d yr n .07347926378864972 8.1802e-09 deg/d Q 7.418909187277965 5.5061e-07 au   Orbit Determination Parameters    # obs. used (total)      581      data-arc span      5994 days (16.41 yr)      first obs. used      1997-10-29      last obs. used      2014-03-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .70002      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 11:13:09   Additional Information  Earth MOID = 3.04544 au   Jupiter MOID = .253512 au   T_jup = 2.596  [ 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 6.8   0.7 88 from 189 observations, assumed slope, autocmod 2.8 comet total magnitude slope K1 14.25   n/a 88 autocmod 2.8 comet nuclear magnitude M2 12.6   0.7 88 from 300 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 88 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 88 autocmod 2.8 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2012.3   242P/2010 P3         1998.9   242P/1998 U4        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-05 11:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin