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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3847585314858381 7.5851e-08  
a 3.307323813666711 2.5083e-08 au
q 2.034802759972166 2.5183e-07 au
i 19.08489666393318 9.6355e-06 deg
node 351.8752718305191 1.5911e-05 deg
peri 20.22209028153708 2.1475e-05 deg
M 329.2846236867209 1.0968e-05 deg
tp 2459187.941971502472
(2020-Dec-04.44197150)
6.7766e-05 TDB
period 2196.916262807336
6.01
2.4992e-05
6.842e-08
d
yr
n .1638660544758192 1.8641e-09 deg/d
Q 4.579844867361257 3.4734e-08 au
  Orbit Determination Parameters
   # obs. used (total)      502  
   data-arc span      17116 days (46.86 yr)  
   first obs. used      1973-09-20  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52801  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:43:05  

Additional Information
 Earth MOID = 1.04286 au 
 Jupiter MOID = .997689 au 
 T_jup = 2.964 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457199.5 (2015-Jun-26.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .391959274633747 7.4437e-08  
q 1.99829213416525 2.4477e-07 au
tp 2456999.043114833296
(2014-Dec-07.54311483)
5.7753e-05 TDB
node 352.3095672217326 1.5944e-05 deg
peri 19.69484528031433 2.0984e-05 deg
i 19.24207495747887 9.6527e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      502  
   data-arc span      17116 days (46.86 yr)  
   first obs. used      1973-09-20  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52801  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:43:05  

Additional Information
 Jupiter MOID = .997689 au 
 T_jup = 2.964 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.540930768242355E-15 -1.819056301539491E-14 -3.676451289556164E-12 2.434173842810079E-14 -8.752135062778725E-13 -2.307470351013074E-14
q -1.819056301539491E-14 5.991179616509898E-14 1.205352988956693E-11 -7.165070099414522E-14 2.866678775457547E-12 7.050708858168256E-14
tp -3.676451289556164E-12 1.205352988956693E-11 3.33538385017092E-9 -4.538793642333737E-11 8.225571496727983E-10 3.232226576467073E-11
node 2.434173842810079E-14 -7.165070099414522E-14 -4.538793642333737E-11 2.54210644474843E-10 -2.486388070520759E-10 -9.208164632192958E-11
peri -8.752135062778725E-13 2.866678775457547E-12 8.225571496727983E-10 -2.486388070520759E-10 4.403436685025333E-10 9.390683067318921E-11
i -2.307470351013074E-14 7.050708858168256E-14 3.232226576467073E-11 -9.208164632192958E-11 9.390683067318921E-11 9.317446512637134E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO445275  

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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