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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 89 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3141568463391375 2.3865e-07  
a 5.645375723299816 4.1898e-07 au
q 3.871842289668418 1.156e-06 au
i 32.14612400222178 1.511e-05 deg
node 181.1266508618351 3.3609e-05 deg
peri 250.5862742849791 9.0121e-05 deg
M 313.7460821502432 4.1028e-05 deg
tp 2456028.982596908944
(2012-Apr-11.48259691)
0.00053691 TDB
period 4899.341405485102
13.41
0.00054542
1.493e-06
d
yr
n .07347926388574569 8.1802e-09 deg/d
Q 7.418909156931214 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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .70006  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:28:04  

Additional Information
 Earth MOID = 3.04544 au 
 Jupiter MOID = .253512 au 
 T_jup = 2.596 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 5.695400813141358E-14 -2.71806860057371E-13 2.794411059818599E-11 -2.213889888212665E-12 5.797059497785372E-12 5.944627528625746E-14
q -2.71806860057371E-13 1.336338785119792E-12 -1.958550781159189E-10 8.225243281783387E-12 -3.486818995315885E-11 -5.393626519676019E-14
tp 2.794411059818599E-11 -1.958550781159189E-10 2.882680914758066E-7 -3.313003424610726E-9 4.416024799023108E-8 -2.630887489237062E-9
node -2.213889888212665E-12 8.225243281783387E-12 -3.313003424610726E-9 1.129598029635191E-9 -1.674696594827129E-9 1.51606312140223E-10
peri 5.797059497785372E-12 -3.486818995315885E-11 4.416024799023108E-8 -1.674696594827129E-9 8.121809710628477E-9 -5.611293426919284E-10
i 5.944627528625746E-14 -5.393626519676019E-14 -2.630887489237062E-9 1.51606312140223E-10 -5.611293426919284E-10 2.283223746920386E-10

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 89 from 189 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 14.25   n/a 89 autocmod 2.9c
comet nuclear magnitude M2 12.6   0.7 89 from 300 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 89 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 89 autocmod 2.9c

[ 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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