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118P/Shoemaker-Levy 4
Classification: Jupiter-family Comet          SPK-ID: 1000150
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456870.5 (2014-Aug-01.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4284008514317814 8.0701e-08  
a 3.46447388745636 2.5333e-07 AU
q 1.980290324306882 3.5378e-07 AU
i 8.513139576862198 5.0513e-06 deg
node 151.728670827085 3.7636e-05 deg
peri 302.2822800881896 5.1434e-05 deg
M 255.1892463177828 3.2002e-05 deg
tp 2457556.237197982709
(2016-Jun-16.73719798)
0.00028001 JED
period 2355.34410927206
6.45
0.00025835
7.073e-07
d
yr
n .1528439087022665 1.6765e-08 deg/d
Q 4.948657450605839 3.6186e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.445185871868745E-9 9.971E-11
A2 [EST] -1.803951620760579E-9 5.204E-12
  Orbit Determination Parameters
   # obs. used (total)      2069  
   data-arc span      6982 days (19.12 yr)  
   first obs. used      1995-06-22  
   last obs. used      2014-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .88504  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2014-Aug-07 14:34:51  

Additional Information
 Earth MOID = 1.0111 AU 
 T_jup = 2.960 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 10.4 mag 1. 50 2 parameter fit from 552 observations, autocmod 2.5c
comet total magnitude slope K1 13.   n/a 50 autocmod 2.5c
comet nuclear magnitude M2 13.9 mag 0.8 50 from 1194 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 50 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 50 autocmod 2.5c
diameter diameter 4.8 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

118P/Shoemaker-Levy 4          Discovered 1991-Feb-09 by Shoemaker, Carolyn & Eugene, & Levy, D. H. at Palomar Mountain Observatory, California (675)
discovered on plate/photo taken on discovery date as well as 2/11
Reference: comet.disLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (AU) Minimum Distance (AU) Maximum Distance (AU) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1900-Dec-12 19:34 00:17 Jupiter 1.05220344176234 1.05176154688867 1.05264524984612 5.43206933898021 5.28179701319514 2415366.315159086 16.9258706088362 3649.28460535125 15.9245053123106 -22.4361325824917 338854.071936958 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
1949-Apr-25 13:43 00:11 Jupiter 0.654789885119293 0.654771027095062 0.654808746081976 3.90056768388104 3.55348702539549 2433032.071389333 11.4004965346157 211.355081787974 15.3057605032608 -45.8434346846303 296777.791986401 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
1960-Jun-28 04:41 00:02 Jupiter 1.51231484455255 1.51222861624362 1.51240106950575 6.74012873467457 6.65651323590211 2437113.694920018 2.32295663069092 844.732079244335 8.01489538231053 -15.7323319326609 853864.459574923 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
2020-Jul-26 16:56 00:01 Jupiter 0.660691544266379 0.660683961885563 0.660699126718882 4.337792778667 4.03142628477434 2459057.205790595 1.43540573860846 55.6905468503197 6.21115377039846 -41.113337502041 756450.993837408 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
2032-Jan-13 04:33 00:04 Jupiter 0.821827954411625 0.82180068139964 0.821855226736329 3.97006501066198 3.70136498063837 2463244.689897682 3.67219297867941 139.747304653014 11.9183255395468 -15.0655511215499 181728.951730579 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
2091-Jun-20 10:04 00:12 Jupiter 1.97770312420697 1.97744338153562 1.97796283605734 8.30434522309895 8.25261035244925 2484952.919579950 12.1127548326546 3412.2603128321 70.6108065461367 -5.99039977124152 60668.8069436033 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
2103-Aug-06 20:52 00:19 Jupiter 0.532626545117396 0.532549904736355 0.532703206416308 3.59700003679749 3.12375733334655 2489382.369463867 19.2715705394998 353.361505677344 29.923548262973 56.8505524525196 132512.636954271 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
2150-Nov-22 20:20 01:33 Jupiter 1.60643563282722 1.60322870637446 1.60963679241471 6.99572302058418 6.91994249015828 2506657.347244144 93.1815046079745 33016.460667139 94.7912790799323 -6.30765344862709 31810.9738978043 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42
2162-Aug-30 08:12 00:24 Jupiter 1.36543150504546 1.36396096128962 1.36690058510635 5.57330160867648 5.46086297123978 2510955.841975200 23.9444021068542 12610.192601278 6.56043890597274 -8.67514280279275 427481.342594785 T 50 CATAB v2.0c-linF95 2014-Aug-07 14:42:02 2014-Aug-07 14:42

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1997.1   118P/1995 M1       
 1990.7   118P/1991 C2   1990 XII   1991f 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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