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94P/Russell 4
Classification: Encke-type Comet          SPK-ID: 1000075
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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:
Orbital Elements at Epoch 2455408.5 (2010-Jul-31.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3630744636188046 7.8256e-08  
a 3.517254894526968 1.2906e-07 au
q 2.240229460285974 2.6604e-07 au
i 6.182454469682845 5.5394e-06 deg
node 70.91256840889369 7.4913e-05 deg
peri 92.83431427445655 7.9134e-05 deg
M 18.42154014071036 1.3241e-05 deg
tp 2455285.210064081654
(2010-Mar-29.71006408)
8.4511e-05 TDB
period 2409.373841252181
6.60
0.00013261
3.631e-07
d
yr
n .1494164142717278 8.224e-09 deg/d
Q 4.794280328767962 1.7592e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -2.265767020012191E-10 1.331E-10
A2 [EST] 2.482714226242722E-11 2.157E-12
  Orbit Determination Parameters
   # obs. used (total)      1481  
   data-arc span      13379 days (36.63 yr)  
   first obs. used      1984-03-02  
   last obs. used      2020-10-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .61788  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2020-Nov-17 12:23:41  

Additional Information
 Earth MOID = 1.25961 au 
 Jupiter MOID = .45595 au 
 T_jup = 3.003 
[ 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 13.1   0.8 48 2 parameter fit from 555 observations, autocmod 2.8
comet total magnitude slope K1 9.5   n/a 48 autocmod 2.8
comet nuclear magnitude M2 15.1   0.6 48 from 750 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 48 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 48 autocmod 2.8
rotation period rot_per 20.70 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Kokotankekova, R.; Snodgrass, C.; Lacerda, P.; Green S.F.; et al. (2017) Mon. Not. Royal Ast. Soc. 471, 2974-3007.]

94P/Russell 4          Discovered 1984-Mar-07 by Russell, Kenneth S. at U. K. Schmidt Telescope Unit, Siding Spring
discovered on plate/photo taken on discovery date
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1990.5   94P/1989 X2   1990 XI   1989g1 
 1983.9   94P/1984 E1   1984 I   1984d 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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