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C/2021 A9 (PANSTARRS)
Classification: Hyperbolic Comet          SPK-ID: 1003760
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

[ hide orbit diagram ]

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 2459241.5 (2021-Jan-27.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.002678365307459 0.0033807  
a -2896.048809951662 3656 au
q 7.756676661282186 0.0028929 au
i 158.0230574182327 0.0091417 deg
node 314.8478352815558 0.011064 deg
peri 211.5219422434967 0.04139 deg
M -.006573263737213396 0.01244 deg
tp 2460280.907388374861
(2023-Dec-02.40738837)
1.1817 TDB
period n/a
n/a
n/a
n/a
d
yr
n 6.324049463888124E-6 1.1975e-05 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      70  
   data-arc span      96 days  
   first obs. used      2020-12-12  
   last obs. used      2021-03-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .29154  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:34:17  

Additional Information
 Earth MOID = 6.79449 au 
 Jupiter MOID = 2.71744 au 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 6.9   0.4 4 from 64 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 9.25   n/a 4 autocmod 2.9c
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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