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JPL Small-Body Database Browser
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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 2456729.5 (2014-Mar-13.0) TDB
Reference: JPL K192/5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4619470353743215 1.9389e-07  
a 3.735867254747169 4.2854e-07 au
q 2.010094451864709 9.4926e-07 au
i 6.254021454418187 6.2276e-06 deg
node 210.5611153184889 0.00014064 deg
peri 192.7547414922277 0.0001462 deg
M 107.9019198213718 1.4563e-05 deg
tp 2455938.981109850876
(2012-Jan-12.48110985)
9.6313e-05 TDB
period 2637.458174282804
7.22
0.00045382
1.242e-06
d
yr
n .1364950555463856 2.3486e-08 deg/d
Q 5.461640057629629 6.2651e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.586577280354216E-10 1.263E-10
A2 [EST] 3.809412379492953E-10 1.197E-11
A3 [EST] -2.53181412767283E-10 5.772E-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)      4900  
   data-arc span      3171 days (8.68 yr)  
   first obs. used      2011-05-03  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59664  
   source      ORB  
   producer      Javier Roa  
   solution date      2020-Jan-13 10:57:45  

Additional Information
 Earth MOID = 1.0198 au 
 Jupiter MOID = .0201683 au 
 T_jup = 2.887 
 Nongrav. accels. using CO driven g(r) 
[ 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 8.2   0.9 K192/5 2 parameter fit from 1236 observations, autocmod 2.8
comet total magnitude slope K1 15.5   n/a K192/5 autocmod 2.8
comet nuclear magnitude M2 12.6   0.7 K192/5 from 3468 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a K192/5 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a K192/5 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 03:15 09:50 Jupiter 0.168917617922897 0.168593503623668 0.16924198672292 4.32007385552708 2.93840335710843 2419316.635154061 589.759371746947 21348.4046258749 293.351703313652 26.3795157054222 46205.2618155481 T K192/5 CATAB v2.0f-lin.ifort 2020-Jan-13 11:02:04 2020-Jan-13 11:02
1934-Apr-03 17:28 08:45 Jupiter 1.70329942931951 1.69940884932718 1.70719056966528 7.60592687521435 7.54026238598167 2427531.227966342 524.511696558772 200089.452817108 740.962959289031 16.3708998549182 58466.7207575872 T K192/5 CATAB v2.0f-lin.ifort 2020-Jan-13 11:02:04 2020-Jan-13 11:02
1971-Jun-04 10:59 01:24 Jupiter 0.96036323986259 0.959623506101591 0.961103016326602 5.88195131133489 5.73004261998268 2441106.957357761 84.1814865504057 38270.2585411351 601.099165265238 -19.475901050161 62952.2569333411 T K192/5 CATAB v2.0f-lin.ifort 2020-Jan-13 11:02:04 2020-Jan-13 11:02
1995-Feb-06 14:10 00:20 Jupiter 0.620899534304727 0.620785231084346 0.62101383702598 5.14519581702266 4.87285006852336 2449755.090165632 20.0307798106697 5620.23102774805 389.907503546452 -14.670276763124 44306.5440643983 T K192/5 CATAB v2.0f-lin.ifort 2020-Jan-13 11:02:04 2020-Jan-13 11:02
2029-Sep-15 09:12 00:25 Jupiter 0.0183978180443872 0.018391454968572 0.0184041849880715 10.1619565099619 3.34466384732498 2462394.883497023 25.4867945242816 1208.6670756039 324.083925348423 71.3474124829488 19474.1947813457 T K192/5 CATAB v2.0f-lin.ifort 2020-Jan-13 11:02:04 2020-Jan-13 11:02
2038-Mar-14 08:39 19:03 Jupiter 1.91623433864183 1.9157588245899 1.91671002149999 3.33302799148796 3.19765955068301 2465496.860276627 1143.19370854355 52203.2090554307 17429.9490184031 -74.3319193718405 9967.56773230076 T K192/5 CATAB v2.0f-lin.ifort 2020-Jan-13 11:02:04 2020-Jan-13 11:02
2046-Oct-10 10:08 20:26 Jupiter 0.0404723201009428 0.0396386105307118 0.0415181970960745 7.37693967267022 3.54434186899279 2468628.922162629 1225.60193298844 244193.651909334 8310.3024412529 -78.6074841338964 1298.69479576531 T K192/5 CATAB v2.0f-lin.ifort 2020-Jan-13 11:02:04 2020-Jan-13 11:02

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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