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JPL Small-Body Database Browser
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77P/Longmore
Classification: Jupiter-family Comet          SPK-ID: 1000059
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | 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 2455395.5 (2010-Jul-18.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3579075021671352 1.7822e-07  
a 3.599323384945068 4.863e-08 au
q 2.311098542747621 6.2691e-07 au
i 24.39924221547497 1.8665e-05 deg
node 14.91285511991158 1.6073e-05 deg
peri 196.7523001954945 3.5888e-05 deg
M 54.12976519592814 1.7837e-05 deg
tp 2455020.472278452093
(2009-Jul-07.97227845)
0.00012877 TDB
period 2494.191121438718
6.83
5.0548e-05
1.384e-07
d
yr
n .1443353706560956 2.9252e-09 deg/d
Q 4.887548227142516 6.6035e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.732576243323444E-9 2.018E-10
A2 [EST] -4.848233063201061E-10 3.915E-12
A3 [EST] 1.446975473680593E-9 2.703E-10
  Orbit Determination Parameters
   # obs. used (total)      1785  
   data-arc span      15771 days (43.18 yr)  
   first obs. used      1975-08-11  
   last obs. used      2018-10-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .7472  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2018-Oct-30 15:21:19  

Additional Information
 Earth MOID = 1.31567 au 
 Jupiter MOID = .202077 au 
 T_jup = 2.860 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 9.5   01. 32 2 parameter fit from 545 observations, autocmod 2.6q
comet total magnitude slope K1 14.   n/a 32 autocmod 2.6q
comet nuclear magnitude M2 13.3   0.7 32 from 1065 observations, autocmod 2.6q
comet nuclear magnitude slope K2 5.   n/a 32 autocmod 2.6q
comet nuclear phase coefficient PC 0.03   n/a 32 autocmod 2.6q
diameter diameter 8.2 km n/a Scotti,J (1994) BAAS 26:1375  

77P/Longmore          Discovered 1975-Jun-10 by Longmore, Andrew Jonathan at Siding Spring Observatory, Australia
discovered on plate/photo taken on discovery date
Reference: comet.disLast Updated: 2003-08-29

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Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1995.9           1994q 
 1989.0       1988 XVIII   1987c1 
 1982.2   77P/1981 A1   1981 XVI   1981a 
 1975.4   77P/1975 L1   1974 XIV   1975g 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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