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23P/Brorsen-Metcalf
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000009
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 2447800.5 (1989-Oct-01.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 0.9719522579248509597249 6.9621e-07  
a 17.069206834622299595594 0.00041942 AU
q 0.4787527107248574775866 8.3143e-07 AU
i 19.333940469818628571374 5.3648e-05 deg
node 311.5854622141069 0.00012597 deg
peri 129.6106836788667 0.00021024 deg
M .2664191525503107 1.0108e-05 deg
tp 2447781.437433134682
(1989-Sep-11.93743313)
2.7505e-05 JED
period 25758.37362225135
70.52
0.94939
0.002599
d
yr
n .01397603766757286 5.1512e-07 deg/d
Q 33.65966095851974 0.00082707 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.24654685575494E-9 2.147E-10
A2 [EST] -5.326929396349485E-10 6.488E-14
  Orbit Determination Parameters
   # obs. used (total)      223  
   data-arc span      51904 days (142.11 yr)  
   first obs. used      1847-08-01  
   last obs. used      1989-09-09  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      1.2347  
   data source      ORB  
   producer      M.S.W. Keesey  
   solution date      2002-Mar-01 13:24:57  

Additional Information
 Earth MOID = .193872 AU 
 T_jup = 1.109 
[ 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 7.8 mag n/a ICQ 1991 Handbook  
comet total magnitude slope K1 8.0   n/a ICQ 1991 Handbook  
comet nuclear magnitude M2 14. mag n/a ICQ 1991 Handbook  
comet nuclear magnitude slope K2 5.0   n/a ICQ 1991 Handbook  
comet nuclear phase coefficient PC 0.03   n/a ICQ 1991 Handbook  

23P/Brorsen-Metcalf          Discovered 1847-Jul-20 by Brorsen, T. at Altona Observatory, Germany
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1989.7   23P/1989 N1   1989 X   1989o 
 1919.2   23P/1919 Q1   1919 III   1919b 
 1848.6   23P/1847 O1   1847 V   
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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