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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1490476146221037 6.5618e-08  
a 2.317826156495481 1.7493e-08 AU
q 1.972359696761111 1.5681e-07 AU
i 6.850373266863356 7.3549e-06 deg
node 317.4596544886004 5.6116e-05 deg
peri 350.726499617959 6.3788e-05 deg
M 225.2662453534748 3.6903e-05 deg
tp 2457482.884814697186
(2016-Apr-04.38481470)
0.00013516 JED
period 1288.901461601668
3.53
1.4591e-05
3.995e-08
d
yr
n .2793076202680707 3.1619e-09 deg/d
Q 2.663292616229852 2.01e-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 = .959093 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 13.7 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

[ 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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