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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 ]

[ show orbit diagram ]
:
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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