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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 2453742.5 (2006-Jan-07.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2527706543668399 7.3309e-06  
a 3.164588958957912 7.3939e-06 AU
q 2.364673737000044 2.8716e-05 AU
i 1.266167584796173 3.8187e-05 deg
node 51.64705765307728 0.00045475 deg
peri 325.7623149967472 0.0013475 deg
M 28.56641182132622 0.00050644 deg
tp 2453579.334783442526
(2005-Jul-27.83478344)
0.0023261 JED
period 2056.242776589769
5.63
0.0072065
1.973e-05
d
yr
n .1750766028693614 6.1359e-07 deg/d
Q 3.964504180915779 9.2629e-06 AU
  Orbit Determination Parameters
   # obs. used (total)      120  
   data-arc span      1731 days (4.74 yr)  
   first obs. used      2005-10-23  
   last obs. used      2010-07-20  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      2  
   fit RMS      .72655  
   data source      ORB  
   producer      Otto Matic  
   solution date      2011-Sep-14 21:13:38  

Additional Information
 Earth MOID = 1.36567 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 12 from 56 observations, assumed slope, autocmod 2.5a
comet total magnitude slope K1 14.   n/a 12 autocmod 2.5a
comet nuclear magnitude M2 17.7 mag 1. 12 from 40 observations, autocmod 2.5a
comet nuclear magnitude slope K2 5.   n/a 12 autocmod 2.5a
comet nuclear phase coefficient PC 0.03   n/a 12 autocmod 2.5a

[ 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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