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261P/Larson
Classification: Jupiter-family Comet          SPK-ID: 1001652
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456691.5 (2014-Feb-03.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3918044347909574 7.5432e-07  
a 3.591629764697532 2.658e-07 au
q 2.184413294761836 2.6126e-06 au
i 6.336230938813235 1.2242e-05 deg
node 298.4259584681838 0.0001101 deg
peri 58.97380853896804 0.0002556 deg
M 71.08670070221258 6.7232e-05 deg
tp 2456200.567676781030
(2012-Sep-30.06767678)
0.00047928 TDB
period 2486.19832701461
6.81
0.00027599
7.556e-07
d
yr
n .1447993895291059 1.6074e-08 deg/d
Q 4.998846234633228 3.6994e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.005917038976903E-9 7.892E-10
A2 [EST] 8.846469482309593E-10 1.318E-11
  Orbit Determination Parameters
   # obs. used (total)      1014  
   data-arc span      5337 days (14.61 yr)  
   first obs. used      2005-07-03  
   last obs. used      2020-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .76616  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:28:08  

Additional Information
 Earth MOID = 1.18642 au 
 Jupiter MOID = .720208 au 
 T_jup = 2.968 
[ 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 7.5   0.8 48 2 parameter fit from 548 observations, autocmod 2.9c
comet total magnitude slope K1 27.   n/a 48 autocmod 2.9c
comet nuclear magnitude M2 15.7   0.7 48 from 399 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 48 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 48 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2012.7   261P/2012 K4       
 2005.9   261P/2005 N3       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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