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7181 (1991 PH12)
Classification: Main-belt Asteroid          SPK-ID: 2007181
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .135251402695053 7.0611e-08  
a 3.089956559378772 3.0876e-08 AU
q 2.672035600456013 2.2404e-07 AU
i 11.64900493820951 8.406e-06 deg
node 291.1926377694949 4.1677e-05 deg
peri 148.3284342039073 5.6773e-05 deg
M 21.29153132408681 3.5708e-05 deg
tp 2456883.163971438190
(2014-Aug-13.66397144)
0.00019662 JED
period 1983.932937433431
5.43
2.9736e-05
8.141e-08
d
yr
n .1814577464829652 2.7198e-09 deg/d
Q 3.50787751830153 3.5052e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      823  
   data-arc span      22388 days (61.30 yr)  
   first obs. used      1953-09-16  
   last obs. used      2015-01-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47938  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 00:20:12  

Additional Information
 Earth MOID = 1.69547 AU 
 T_jup = 3.180 
[ 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
absolute magnitude H 12.3 mag n/a MPO279590  

7181 (1991 PH12)          Discovered 1991-Aug-07 by Holt, H. E. at Palomar (675)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1991 PH12 = 1986 RN4 = 1986 TU2 = 1986 VK9 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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