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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .149419552736882 6.5634e-08  
a 2.317550900556906 1.7323e-08 au
q 1.971263481550735 1.5691e-07 au
i 6.849759405311803 7.3549e-06 deg
node 317.4567879474653 5.6131e-05 deg
peri 350.8133269258491 6.3773e-05 deg
M 32.82343451405666 3.7902e-05 deg
tp 2457483.003786746880
(2016-Apr-04.50378675)
0.00013492 JED
period 1288.671871098944
3.53
1.4448e-05
3.956e-08
d
yr
n .2793573818702211 3.1321e-09 deg/d
Q 2.663838319563077 1.9911e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1019  
   data-arc span      13779 days (37.72 yr)  
   first obs. used      1977-08-14  
   last obs. used      2015-05-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48252  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:04:27  

Additional Information
 Earth MOID = .956552 au 
 Jupiter MOID = 2.57489 au 
 T_jup = 3.556 
[ 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 13.7 mag n/a MPO337335  

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

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