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78P/Gehrels 2
Classification: Jupiter-family Comet          SPK-ID: 1000030
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 2456966.5 (2014-Nov-05.0) TDB
Reference: JPL K192/19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4616643215463381 1.8128e-07  
a 3.736348077733531 3.4971e-07 au
q 2.011409477365716 8.5996e-07 au
i 6.252821276087988 5.4014e-06 deg
node 210.5626210607211 4.1185e-05 deg
peri 192.7561909929703 5.0034e-05 deg
M 140.2700250333011 1.3621e-05 deg
tp 2455938.645141657307
(2012-Jan-12.14514166)
0.00011064 TDB
period 2637.967369832023
7.22
0.00037036
1.014e-06
d
yr
n .1364687084900991 1.9159e-08 deg/d
Q 5.461286678101346 5.1116e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -8.903890485206713E-10 1.097E-10
A2 [EST] 3.472101564500642E-10 1.13E-11
ALN [SET] .0408373333128795 n/a
NK [SET] 2.6 n/a
NM [SET] 2. n/a
NN [SET] 3. n/a
R0 [SET] 5. n/a
  Orbit Determination Parameters
   # obs. used (total)      5523  
   data-arc span      3311 days (9.07 yr)  
   first obs. used      2011-05-03  
   last obs. used      2020-05-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60195  
   source      ORB  
   producer      Javier Roa  
   solution date      2020-Nov-02 12:51:03  

Additional Information
 Earth MOID = 1.02026 au 
 Jupiter MOID = .0215566 au 
 T_jup = 2.887 
[ 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 8.8   0.8 K192/19 2 parameter fit from 1800 observations, autocmod 2.8
comet total magnitude slope K1 13.75   n/a K192/19 autocmod 2.8
comet nuclear magnitude M2 12.6   0.7 K192/19 from 3507 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a K192/19 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a K192/19 autocmod 2.8

78P/Gehrels 2          Discovered 1973-Sep-29 by Gehrels, Tom
discovered on plate/photo taken on discovery date as well as 9/30, 10/4
Reference: comet.disLast Updated: 2003-08-29

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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
1911-Oct-07 02:32 09:35 Jupiter 0.168929794463464 0.16861361702724 0.169246213122546 4.32011074904417 2.93858059925087 2419316.605784627 575.124819045544 20806.1673366737 264.531397587394 26.3297421872778 53349.006978058 T K192/19 CATAB v2.0f-lin.ifort 2020-Nov-02 13:02:02 2020-Nov-02 13:02
1934-Apr-03 15:35 08:29 Jupiter 1.703274078989 1.69948383392427 1.70706485490614 7.60593214944609 7.54026672458533 2427531.149123557 509.007678099082 194918.123331263 367.83067518013 16.3602749280398 109375.254362462 T K192/19 CATAB v2.0f-lin.ifort 2020-Nov-02 13:02:02 2020-Nov-02 13:02
1971-Jun-04 10:09 01:22 Jupiter 0.960437771845077 0.959715882880107 0.961159701499268 5.88223683497349 5.73034765680323 2441106.923184406 82.2835313915984 37347.5644668822 393.584611107406 -19.4789499114026 97978.8076357594 T K192/19 CATAB v2.0f-lin.ifort 2020-Nov-02 13:02:02 2020-Nov-02 13:02
1995-Feb-06 13:52 00:20 Jupiter 0.620922910974635 0.620811947750924 0.621033873710775 5.14529457417017 4.87296488477639 2449755.078056639 19.5036988798988 5452.97844364057 236.367860659207 -14.4968286981419 70903.1688830688 T K192/19 CATAB v2.0f-lin.ifort 2020-Nov-02 13:02:02 2020-Nov-02 13:02
2029-Sep-15 10:27 00:20 Jupiter 0.0183908705786415 0.0183849723782229 0.0183967712636726 10.1636275981825 3.34454149872325 2462394.935735068 19.8040001461217 931.03211144516 279.059289044933 65.8025332258139 21703.1894413119 T K192/19 CATAB v2.0f-lin.ifort 2020-Nov-02 13:02:02 2020-Nov-02 13:02
2038-Mar-16 07:15 17:10 Jupiter 1.9153787352026 1.91492789005527 1.91582981731871 3.33296520203475 3.19753235192205 2465498.802184397 1030.24025372872 48375.205896231 12629.9608045282 -69.5531396483117 13365.6975763692 T K192/19 CATAB v2.0f-lin.ifort 2020-Nov-02 13:02:02 2020-Nov-02 13:02
2046-Oct-08 19:15 16:06 Jupiter 0.0385617448037279 0.0382578097522688 0.0390423948928726 7.50335133735216 3.51703938180315 2468627.302324800 966.383806389754 225538.454023326 6024.96134867667 -86.3692627771635 1791.86261467092 T K192/19 CATAB v2.0f-lin.ifort 2020-Nov-02 13:02:02 2020-Nov-02 13:02

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1990.4       1989 XVII   1989n 
 1983.1   78P/1981 L1   1981 XVII   1981f 
 1975.9   78P/1973 S1   1973 XI   1973n 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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