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48P/Johnson
Classification: Jupiter-family Comet          SPK-ID: 1000049
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.


:
Orbital Elements at Epoch 2455228.5 (2010-Feb-01.0) TDB
Reference: JPL 68 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3678117401626815 9.2951e-08  
a 3.641982389984688 3.5222e-08 au
q 2.302418509482578 3.3253e-07 au
i 13.66068838516227 9.449e-06 deg
node 117.2884957292427 2.0401e-05 deg
peri 207.8266217590061 2.7055e-05 deg
M 274.2111240551269 9.854e-06 deg
tp 2455833.469759048695
(2011-Sep-28.96975905)
7.1147e-05 TDB
period 2538.663793630759
6.95
3.6828e-05
1.008e-07
d
yr
n .1418068831734246 2.0572e-09 deg/d
Q 4.981546270486797 4.8177e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 5.674272798225169E-9 8.643E-11
A2 [EST] -1.730162474683401E-10 2.599E-12
  Orbit Determination Parameters
   # obs. used (total)      2140  
   data-arc span      26012 days (71.22 yr)  
   first obs. used      1949-09-24  
   last obs. used      2020-12-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .74371  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2021-Mar-19 11:17:03  

Additional Information
 Earth MOID = 1.3007 au 
 Jupiter MOID = .474682 au 
 T_jup = 2.941 
[ 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 9.3   0.9 68 2 parameter fit from 856 observations, autocmod 2.9b
comet total magnitude slope K1 15.75   n/a 68 autocmod 2.9b
comet nuclear magnitude M2 13.5   0.7 68 from 985 observations, autocmod 2.9b
comet nuclear magnitude slope K2 5.   n/a 68 autocmod 2.9b
comet nuclear phase coefficient PC 0.03   n/a 68 autocmod 2.9b
diameter diameter 5.74 km n/a Lamy,P.L.;Toth,I.;Fernandez,Y.R.;Weaver,H.A.; (2004) Comets II, pp. 223-264  

48P/Johnson          Discovered 1949-Aug-25 by Johnson, Ernest Leonard at Union Observatory, South Africa
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 
 1990.9       1990 XXIII   1990h 
 1983.9       1983 XVIII   1983h 
 1977.0       1977 I   1976h 
 1970.0       1970 IV   1970h 
 1963.1       1963 IV   1963c 
 1956.1   48P/1956 P1   1956 V   1956f 
 1949.2   48P/1949 Q1   1949 II   1949d 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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