+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   137P/Shoemaker-Levy 2 Classification: Jupiter-family Comet          SPK-ID: 1000126 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2457320.5 (2015-Oct-25.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5720767979726137 8.2561e-08   a 4.51748651785274 8.3617e-08 au q 1.933137295835092 4.0417e-07 au i 4.850499244172441 6.242e-06 deg node 233.0729149327298 0.00013133 deg peri 140.9955115870911 0.00012958 deg M 242.3503575148533 3.9285e-06 deg tp 2458466.624603634097 (2018-Dec-14.12460363) 6.163e-05 TDB period 3507.064268047956 9.60 9.7372e-05 2.666e-07 d yr n .1026499580517745 2.85e-09 deg/d Q 7.101835739870388 1.3145e-07 au   Orbit Determination Parameters    # obs. used (total)      1181      data-arc span      10754 days (29.44 yr)      first obs. used      1990-09-16      last obs. used      2020-02-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42643      source      ORB      producer      Otto Matic      solution date      2020-Mar-19 18:45:28   Additional Information  Earth MOID = .93656 au   Jupiter MOID = .0778273 au   T_jup = 2.675  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 15.4   0.5 38 2 parameter fit from 571 observations, autocmod 2.8 comet total magnitude slope K1 4.5   n/a 38 autocmod 2.8 diameter diameter 5.8 km n/a DASTCOM value unverified rotation period rot_per 7.7 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Kokotankekova, R.; Snodgrass, C.; Lacerda, P.; Green S.F.; et al. (2017) Mon. Not. Royal Ast. Soc. 471, 2974-3007.] 137P/Shoemaker-Levy 2          Discovered 1990-Oct-25 by Shoemaker, Carolyn S. at Palomar Mountain Observatory, California discovered on plate/photo taken on discovery date as well as 11/13,15 Reference: comet.dis Last Updated: 2006-10-18 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1999.7   137P/1998 K6         1990.1   137P/1990 UL3   1990 XVI   1990p  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 11:27 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin