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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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3844500571285527 6.731e-08  
a 3.305503299195193 1.6242e-08 au
q 2.034702366980982 2.2147e-07 au
i 19.08855348841697 8.1511e-06 deg
node 351.8698203412561 1.0571e-05 deg
peri 20.25660624833719 1.728e-05 deg
M 2.045668964883145 8.4048e-06 deg
tp 2459188.026518851399
(2020-Dec-04.52651885)
5.1251e-05 TDB
period 2195.102575529851
6.01
1.6179e-05
4.43e-08
d
yr
n .1640014475920806 1.2087e-09 deg/d
Q 4.576304231409405 2.2486e-08 au
  Orbit Determination Parameters
   # obs. used (total)      963  
   data-arc span      17348 days (47.50 yr)  
   first obs. used      1973-09-20  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46518  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:51:30  

Additional Information
 Earth MOID = 1.04129 au 
 Jupiter MOID = 1.00216 au 
 T_jup = 2.965 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457998.5 (2017-Sep-02.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3890482796103178 6.6133e-08  
q 2.014743397710885 2.1772e-07 au
tp 2456997.748133524981
(2014-Dec-06.24813352)
5.0689e-05 TDB
node 352.3070576561176 1.0598e-05 deg
peri 20.09122379967944 1.6918e-05 deg
i 19.1925782645208 8.1483e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      963  
   data-arc span      17348 days (47.50 yr)  
   first obs. used      1973-09-20  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46518  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:51:30  

Additional Information
 Jupiter MOID = 1.00216 au 
 T_jup = 2.965 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.37362743871244E-15 -1.438487783433448E-14 -2.852034206690853E-12 6.816089335556075E-14 -7.193610489488868E-13 -7.846687851731014E-14
q -1.438487783433448E-14 4.740123145518683E-14 9.271252318862834E-12 -2.209455711532261E-13 2.357037580229894E-12 2.571420079267271E-13
tp -2.852034206690853E-12 9.271252318862834E-12 2.569418398443301E-9 -7.104027419568345E-11 6.751938964075697E-10 7.477626030588193E-11
node 6.816089335556075E-14 -2.209455711532261E-13 -7.104027419568345E-11 1.123084989860182E-10 -1.202148090167224E-10 -4.677092164112182E-11
peri -7.193610489488868E-13 2.357037580229894E-12 6.751938964075697E-10 -1.202148090167224E-10 2.862104701709945E-10 6.052360287515984E-11
i -7.846687851731014E-14 2.571420079267271E-13 7.477626030588193E-11 -4.677092164112182E-11 6.052360287515984E-11 6.639400762854027E-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 14.76   n/a MPCxxxxx  

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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