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12P/Pons-Brooks
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000068
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 2435000.5 (1954-Sep-15.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 0.9548123941619716115170 3.0452e-08  
a 17.121223241407509618738 1.546e-05 AU
q 0.7736670872976132429243 7.9e-07 AU
i 74.176894232522556649200 4.0465e-05 deg
node 255.8911443583019 8.6118e-05 deg
peri 199.028468565403 0.00015453 deg
M 1.601583044410965 6.1764e-06 deg
tp 2434885.380850198988
(1954-May-22.88085020)
0.00033916 JED
period 25876.20671496702
70.85
0.035049
9.596e-05
d
yr
n .01391239465527121 1.8844e-08 deg/d
Q 33.4687793955174 3.0222e-05 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -1.021678908475834E-9 2.949E-10
A2 [EST] -2.705135237076094E-10 8.372E-14
  Orbit Determination Parameters
   # obs. used (total)      278  
   data-arc span      51861 days (141.99 yr)  
   first obs. used      1812-08-26  
   last obs. used      1954-08-23  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   fit RMS      1.1877  
   data source      ORB  
   producer      M.S.W. Keesey  
   solution date      2001-Nov-05 15:37:25  

Additional Information
 Earth MOID = .1873 AU 
 T_jup = 0.598 
[ 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 5. mag n/a MPC data tape  
comet total magnitude slope K1 15.0   n/a MPC data tape  
comet nuclear magnitude M2 11. mag n/a MPC data tape  
comet nuclear magnitude slope K2 10.0   n/a MPC data tape  

12P/Pons-Brooks          Discovered 1812-Jul-21 by Pons, Jean Louis at Marseilles, France
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1954.4   12P/1953 M1   1954 VII   1953c 
 1883.5   12P/1883 R1   1884 I   1883b 
 1812.7   12P/1812 O1   1812    
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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