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78P/Gehrels 2
Classification: Jupiter-family Comet          SPK-ID: 1000030
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456771.5 (2014-Apr-24.0) TDB
Reference: JPL K114/8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4619028596361237 9.5155e-08  
a 3.73590971838216 9.263e-08 AU
q 2.010282336119055 3.8944e-07 AU
i 6.253845264350978 1.0513e-05 deg
node 210.561210461237 2.4846e-05 deg
peri 192.7544368108993 3.9828e-05 deg
M 113.6399853231238 1.4481e-05 deg
tp 2455938.928282273713
(2012-Jan-12.42828227)
8.4563e-05 JED
period 2637.503142307025
7.22
9.8094e-05
2.686e-07
d
yr
n .1364927283783662 5.0764e-09 deg/d
Q 5.461537100645265 1.3542e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 7.973361440894842E-9 4.74E-11
A2 [EST] -3.216321567295403E-10 4.189E-11
A3 [EST] -4.613162981162791E-10 1.012E-10
DT [EST] -63.40103271807845 2.728
  Orbit Determination Parameters
   # obs. used (total)      5476  
   data-arc span      14794 days (40.50 yr)  
   first obs. used      1973-09-29  
   last obs. used      2014-04-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .62912  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Apr-14 08:45:22  

Additional Information
 Earth MOID = 1.01851 AU 
 T_jup = 2.887 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 6.5 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 14.0   n/a ICQ 2005 Handbook  

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

[ show close-approach data ]
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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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