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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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1490475973475483 7.3489e-08  
a 2.317826151617309 2.0185e-08 AU
q 1.972359732649435 1.7097e-07 AU
i 6.850374816155429 8.2284e-06 deg
node 317.4596540788226 5.8989e-05 deg
peri 350.7264965936901 6.6375e-05 deg
M 225.2662525004484 3.906e-05 deg
tp 2457482.884787586142
(2016-Apr-04.38478759)
0.00014375 JED
period 1288.901457532672
3.53
1.6837e-05
4.61e-08
d
yr
n .2793076211498305 3.6485e-09 deg/d
Q 2.663292570585183 2.3193e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      950  
   data-arc span      13710 days (37.54 yr)  
   first obs. used      1977-08-14  
   last obs. used      2015-02-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48811  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:17:12  

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 13.6 mag n/a MPO279612  

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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