+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   271P/van Houten-Lemmon Classification: Jupiter-family Comet          SPK-ID: 1000103 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455714.5 (2011-Jun-02.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3899422919539769 3.0595e-07   a 6.969382141348709 1.1778e-06 au q 4.251725295648078 2.139e-06 au i 6.856468948092699 3.7009e-05 deg node 9.590606254555283 0.00028727 deg peri 35.0383394977079 0.00037378 deg M 319.048629232431 0.00011717 deg tp 2456478.961796792225 (2013-Jul-05.46179679) 0.0022143 TDB period 6720.318311375008 18.40 0.0017036 4.664e-06 d yr n .05356889113282826 1.358e-08 deg/d Q 9.687038987049341 1.6371e-06 au   Orbit Determination Parameters    # obs. used (total)      96      data-arc span      19841 days (54.32 yr)      first obs. used      1960-09-24      last obs. used      2015-01-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      condition code      0      norm. resid. RMS      .79165      source      ORB      producer      Otto Matic      solution date      2015-Feb-04 13:03:37   Additional Information  Earth MOID = 3.26177 au   Jupiter MOID = .148542 au   T_jup = 2.863  [ 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 6.4   0.5 26 from 67 observations, assumed slope, autocmod 2.6 comet total magnitude slope K1 17.   n/a 26 autocmod 2.6 comet nuclear magnitude M2 14.1   0.5 26 from 16 observations, autocmod 2.6 comet nuclear magnitude slope K2 5.   n/a 26 autocmod 2.6 comet nuclear phase coefficient PC 0.03   n/a 26 autocmod 2.6 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2013.5   271P/2012 TB36         1958.3   271P/1960 S1   1961 X    [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-05 11:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin