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9181 (1991 NP2)
Classification: Main-belt Asteroid          SPK-ID: 2009181
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1486554325614701 8.1021e-08  
a 2.3188195465721 1.9829e-08 AU
q 1.974114423844432 1.8526e-07 AU
i 6.84913423539582 8.5753e-06 deg
node 317.4606263556013 6.2434e-05 deg
peri 350.5439655225575 6.9896e-05 deg
M 169.6504086785744 4.0749e-05 deg
tp 2456192.713198009847
(2012-Sep-22.21319801)
0.00014107 JED
period 1289.730159925564
3.53
1.6543e-05
4.529e-08
d
yr
n .2791281550093992 3.5804e-09 deg/d
Q 2.663524669299766 2.2777e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      908  
   data-arc span      13346 days (36.54 yr)  
   first obs. used      1977-08-14  
   last obs. used      2014-02-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52264  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Mar-22 10:54:09  

Additional Information
 Earth MOID = .958917 AU 
 T_jup = 3.555 
[ 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 13.6 mag n/a MPO279612  

9181 (1991 NP2)          Discovered 1991-Jul-14 by Holt, H. E. at Palomar (675)
Reference: 19980910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 NP2 = 1977 PB2 = 1991 PD3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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