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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2456511.5 (2013-Aug-07.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3904680292697189 7.6783e-07  
a 3.588109024369652 2.9296e-07 au
q 2.18706716481914 2.624e-06 au
i 6.328157514340975 1.2426e-05 deg
node 298.4488543790467 0.00011155 deg
peri 58.9318935299756 0.0002621 deg
M 45.17965005939447 7.2146e-05 deg
tp 2456199.943199883975
(2012-Sep-29.44319988)
0.00049789 TDB
period 2482.543532194686
6.80
0.00030404
8.324e-07
d
yr
n .1450125628539303 1.776e-08 deg/d
Q 4.989150883920163 4.0735e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.382733919904309E-9 8.065E-10
A2 [EST] 8.904419576286346E-10 1.369E-11
  Orbit Determination Parameters
   # obs. used (total)      926  
   data-arc span      5337 days (14.61 yr)  
   first obs. used      2005-07-03  
   last obs. used      2020-02-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .77557  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-09 07:21:11  

Additional Information
 Earth MOID = 1.19023 au 
 Jupiter MOID = .726457 au 
 T_jup = 2.970 
[ 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 7.6   0.8 46 2 parameter fit from 459 observations, autocmod 2.8
comet total magnitude slope K1 26.75   n/a 46 autocmod 2.8
comet nuclear magnitude M2 15.7   0.7 46 from 399 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 46 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 46 autocmod 2.8

[ 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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