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242P/Spahr
Classification: Jupiter-family Comet          SPK-ID: 1000236
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455399.5 (2010-Jul-22.0) TDB
Reference: JPL 88 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3141568505569534 2.3865e-07  
a 5.64537572827304 4.1898e-07 au
q 3.871842269268114 1.156e-06 au
i 32.14612402067504 1.511e-05 deg
node 181.1266510593627 3.3609e-05 deg
peri 250.5862770615376 9.0121e-05 deg
M 313.7460807304692 4.1028e-05 deg
tp 2456028.982617062851
(2012-Apr-11.48261706)
0.00053691 TDB
period 4899.341411959123
13.41
0.00054542
1.493e-06
d
yr
n .07347926378864972 8.1802e-09 deg/d
Q 7.418909187277965 5.5061e-07 au
  Orbit Determination Parameters
   # obs. used (total)      581  
   data-arc span      5994 days (16.41 yr)  
   first obs. used      1997-10-29  
   last obs. used      2014-03-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .70002  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-11 11:13:09  

Additional Information
 Earth MOID = 3.04544 au 
 Jupiter MOID = .253512 au 
 T_jup = 2.596 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 6.8   0.7 88 from 189 observations, assumed slope, autocmod 2.8
comet total magnitude slope K1 14.25   n/a 88 autocmod 2.8
comet nuclear magnitude M2 12.6   0.7 88 from 300 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 88 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 88 autocmod 2.8

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2012.3   242P/2010 P3       
 1998.9   242P/1998 U4       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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