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JPL Small-Body Database Browser
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128P/Shoemaker-Holt 1-B
Classification: Jupiter-family Comet          SPK-ID: 1000117
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2450726.5 (1997-Oct-05.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3212585112842391 5.3372e-06  
a 4.489242443395618 3.4178e-05 au
q 3.047035099236322 1.3524e-06 au
i 4.361724121462829 2.975e-05 deg
node 214.5275829560614 0.00032571 deg
peri 210.2169312978122 0.00033926 deg
M 355.2035465260782 7.0807e-05 deg
tp 2450772.788781930694
(1997-Nov-20.28878193)
0.00052878 TDB
period 3474.225609745049
9.51
0.039676
0.0001086
d
yr
n .1036202136643677 1.1833e-06 deg/d
Q 5.931449787554914 4.5158e-05 au
  Orbit Determination Parameters
   # obs. used (total)      236  
   data-arc span      942 days (2.58 yr)  
   first obs. used      1996-09-16  
   last obs. used      1999-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      3  
   norm. resid. RMS      .54265  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2016-Nov-21 08:50:16  

Additional Information
 Earth MOID = 2.06106 au 
 Jupiter MOID = .148034 au 
 T_jup = 2.913 
 Use 128P orbit 
[ 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 5.6   1. 33 from 111 observations, assumed slope, autocmod 2.6g
comet total magnitude slope K1 19.   n/a 33 autocmod 2.6g
comet nuclear magnitude M2 16.7   0.6 33 from 5 observations, autocmod 2.6g
comet nuclear magnitude slope K2 5.   n/a 33 autocmod 2.6g
comet nuclear phase coefficient PC 0.03   n/a 33 autocmod 2.6g
diameter diameter 4.6 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1988.4   128P-B/1987 U1       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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