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48P/Johnson
Classification: Jupiter-family Comet          SPK-ID: 1000049
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


:
Orbital Elements at Epoch 2456717.5 (2014-Mar-01.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3812385063810066 1.7656e-07  
a 3.634473678659963 1.0894e-07 AU
q 2.248872361926556 6.4118e-07 AU
i 13.96682257238026 1.5031e-05 deg
node 116.7657597518544 2.1229e-05 deg
peri 208.2784435313408 5.3062e-05 deg
M 124.1225150977846 1.6063e-05 deg
tp 2455844.912906123571
(2011-Oct-10.41290612)
0.00012742 JED
period 2530.816859036731
6.93
0.00011379
3.115e-07
d
yr
n .1422465630867583 6.3955e-09 deg/d
Q 5.02007499539337 1.5047e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 6.269397309125737E-9 8.497E-11
A2 [EST] -1.961607995360316E-10 2.036E-12
  Orbit Determination Parameters
   # obs. used (total)      1275  
   data-arc span      23446 days (64.19 yr)  
   first obs. used      1949-09-24  
   last obs. used      2013-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .69299  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Feb-19 12:25:48  

Additional Information
 Earth MOID = 1.24442 AU 
 T_jup = 2.931 
[ 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 8.5 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 15.0   n/a ICQ 2005 Handbook  
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 
 1991.0       1990 XXIII   1990h 
 1984.1       1983 XVIII   1983h 
 1977.1       1977 I   1976h 
 1970.2       1970 IV   1970h 
 1963.3       1963 IV   1963c 
 1956.3   48P/1956 P1   1956 V   1956f 
 1949.4   48P/1949 Q1   1949 II   1949d 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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