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1921 Pala (1973 SE)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001921
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3844500569024087 6.75e-08  
a 3.30550329913446 1.6243e-08 au
q 2.034702367691117 2.221e-07 au
i 19.08855362036287 8.1629e-06 deg
node 351.8698202233916 1.0578e-05 deg
peri 20.25660640787435 1.7308e-05 deg
M 2.045668933441613 8.427e-06 deg
tp 2459188.026519043457
(2020-Dec-04.52651904)
5.1386e-05 TDB
period 2195.102575469352
6.01
1.618e-05
4.43e-08
d
yr
n .1640014475966006 1.2089e-09 deg/d
Q 4.576304230577803 2.2488e-08 au
  Orbit Determination Parameters
   # obs. used (total)      957  
   data-arc span      17309 days (47.39 yr)  
   first obs. used      1973-09-20  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46641  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:06:42  

Additional Information
 Earth MOID = 1.04129 au 
 Jupiter MOID = 1.00216 au 
 T_jup = 2.965 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.75   n/a E2021B10  

1921 Pala (1973 SE)          Discovered 1973-Sep-20 by Gehrels, T. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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