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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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1490475831573863 7.9895e-08  
a 2.317826147026489 2.2441e-08 AU
q 1.972359761633194 1.8267e-07 AU
i 6.850374508406552 8.4845e-06 deg
node 317.4596433515547 6.1583e-05 deg
peri 350.7265063544999 6.8781e-05 deg
M 225.2662568444912 4.0605e-05 deg
tp 2457482.884770600086
(2016-Apr-04.38477060)
0.00014997 JED
period 1288.901453703364
3.53
1.8718e-05
5.125e-08
d
yr
n .2793076219796496 4.0563e-09 deg/d
Q 2.663292532419784 2.5785e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      914  
   data-arc span      13366 days (36.59 yr)  
   first obs. used      1977-08-14  
   last obs. used      2014-03-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47723  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:41:45  

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 (675)
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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