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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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1932-Nov-01 01:20 03:15 Jupiter 0.59021782270765 0.590054597753191 0.590381128491203 2.9085127719168 2.36415808104949 2427012.555521231 195.25320323519 15046.4886782862 337.738312932732 78.5351588263897 107592.546963465 T 46 CATAB v2.0f-lin.ifort 2020-Mar-09 07:21:36 2020-Mar-09 07:21
1968-Dec-21 22:04 01:31 Jupiter 1.23110047644738 1.23096939448157 1.23123155827828 4.0154140762446 3.84024855436234 2440212.419317309 90.683991788527 6507.06690146329 114.639434413833 25.0258914671157 192399.057187459 T 46 CATAB v2.0f-lin.ifort 2020-Mar-09 07:21:36 2020-Mar-09 07:21
2016-Jul-08 04:56 00:17 Jupiter 1.11676722120936 1.1167377687906 1.11679667365364 3.84663730839218 3.64413225979668 2457577.705274502 17.4727878075375 1500.36502387934 89.6951164290006 30.2246731856445 146004.352494502 T 46 CATAB v2.0f-lin.ifort 2020-Mar-09 07:21:36 2020-Mar-09 07:21
2075-Dec-02 18:04 03:12 Jupiter 0.803573753362899 0.803326563408651 0.803820901024 2.85361455796861 2.45661906208831 2479274.252443827 191.756800169484 8024.91150720947 131.453765700372 32.8539764370187 43967.3538861973 T 46 CATAB v2.0f-lin.ifort 2020-Mar-09 07:21:36 2020-Mar-09 07:21
2087-Oct-21 10:13 01:49 Jupiter 1.98326082402843 1.98190670971139 1.9846150288618 6.9385118234557 6.87668341166231 2483614.925476831 109.104845068415 70782.2644517709 471.603745096354 20.117237511277 83120.4259398419 T 46 CATAB v2.0f-lin.ifort 2020-Mar-09 07:21:36 2020-Mar-09 07:21
2147-Apr-02 19:24 15:36 Jupiter 0.73638818705399 0.736368732262721 0.736408775312802 2.63292277038575 2.15216264082723 2505327.308582773 936.199258579494 57214.2274554095 513.8170844661 76.5806600723679 121755.673516727 T 46 CATAB v2.0f-lin.ifort 2020-Mar-09 07:21:36 2020-Mar-09 07:21

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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