+ 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 2457333.5 (2015-Nov-07.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .572069517862926 8.2387e-08   a 4.517561189737063 8.3586e-08 au q 1.933202138007915 4.0338e-07 au i 4.850458802445996 6.2241e-06 deg node 233.0730564957821 0.00013125 deg peri 140.9935558775509 0.00012951 deg M 243.6884491159225 3.9474e-06 deg tp 2458466.617216653027 (2018-Dec-14.11721665) 6.1643e-05 TDB period 3507.151223541397 9.60 9.7336e-05 2.665e-07 d yr n .1026474129725392 2.8488e-09 deg/d Q 7.101920241466211 1.314e-07 au   Orbit Determination Parameters    # obs. used (total)      1189      data-arc span      11112 days (30.42 yr)      first obs. used      1990-09-16      last obs. used      2021-02-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42509      source      ORB      producer      Otto Matic      solution date      2021-Mar-17 23:13:46   Additional Information  Earth MOID = .936689 au   Jupiter MOID = .0778173 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 39 2 parameter fit from 579 observations, autocmod 2.9b comet total magnitude slope K1 4.5   n/a 39 autocmod 2.9b 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-Apr-15 09:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin