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238P/Read
Classification: Encke-type Comet          SPK-ID: 1001676
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456816.5 (2014-Jun-08.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2527781196003774 4.442e-07  
a 3.163221896406786 3.0441e-07 AU
q 2.363628613554339 1.5105e-06 AU
i 1.26513907168384 3.5475e-05 deg
node 51.65730767655864 0.00045186 deg
peri 325.0874020776336 0.00046898 deg
M 207.9600705783461 0.00012873 deg
tp 2457684.356804231062
(2016-Oct-22.85680423)
0.00084967 JED
period 2054.910514044777
5.63
0.00029662
8.121e-07
d
yr
n .1751901104887507 2.5289e-08 deg/d
Q 3.962815179259233 3.8135e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      126  
   data-arc span      2252 days (6.17 yr)  
   first obs. used      2005-10-23  
   last obs. used      2011-12-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      1  
   fit RMS      .71702  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Aug-08 10:21:28  

Additional Information
 Earth MOID = 1.36565 AU 
 T_jup = 3.153 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 13.7 mag 0.6 14 from 56 observations, assumed slope, autocmod 2.5c
comet total magnitude slope K1 14.   n/a 14 autocmod 2.5c
comet nuclear magnitude M2 17.7 mag 1. 14 from 40 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 14 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 14 autocmod 2.5c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2011.2   238P/2010 N2       
 2005.6   238P/2005 U1       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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