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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 ]

[ show orbit diagram ]
:
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

[ hide close-approach data ]
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
1940-Mar-02 13:01 00:11 Jupiter 1.16607180550078 1.16493729970412 1.16720635412115 7.26077569453254 7.16003382276936 2429691.042687666 11.2866381137576 57672.9471314436 1384.63109978138 13.2788845249978 24201.78136256 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22
1963-Oct-17 19:20 < 00:01 Jupiter 0.15773372557823 0.157719512059205 0.157747942223948 6.76411400006115 5.91720664257079 2438320.305487304 0.665659847713603 1442.30923145313 230.551069198401 61.3976826544104 99507.6377966971 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22
1999-Aug-31 13:51 < 00:01 Jupiter 1.63400763094612 1.63399589100702 1.63401937088745 7.39352361509245 7.32307647257968 2451422.077294195 0.985536023451871 593.580224644224 94.401916490107 -11.6826732396487 456037.65983307 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22
2046-Oct-15 13:43 00:01 Jupiter 0.313197689225691 0.313168655897245 0.313226722751914 6.24848573413169 5.79954358010635 2468634.071504826 1.26209202379043 1504.70846177044 79.8839029432493 14.6041769747893 145003.06402922 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22
2058-Oct-10 03:46 00:06 Jupiter 1.85649866426567 1.85643583681671 1.85656149174154 10.6261507105226 10.5831273406761 2473011.656608394 5.69939435855022 3154.49788708839 718.526717588832 8.44228273592222 72061.5731511386 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22
2118-Mar-24 04:45 00:17 Jupiter 0.994909165732561 0.994745456438983 0.995072881629729 6.1354595614812 5.99509389150227 2494725.697912416 17.2829250560935 9134.36038480603 527.341897622091 -28.5954012012948 64924.0594565537 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22
2129-Sep-14 21:20 00:07 Jupiter 0.347405652251771 0.347247498226494 0.347563816003157 6.97554167161996 6.61678985248198 2498918.389008946 7.4099743196304 8461.38917626208 1944.47257954176 -23.9307379100118 11844.0555321464 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22
2177-Feb-16 17:05 00:28 Jupiter 0.405628010931879 0.403499613931194 0.407760427411811 7.05067408752456 6.74801110587527 2516240.211776856 28.3117629378029 124560.271355045 2081.54154205831 -32.7663056537746 16316.3499610498 T 32 CATAB v2.0e-lin.ifort 2018-Oct-30 15:22:07 2018-Oct-30 15:22

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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