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

[ show orbit diagram ]
Orbital Elements at Epoch 2459245.5 (2021-Jan-31.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.003708467746399 0.0020157  
a -2091.425635441723 1136.7 au
q 7.755984513027644 0.0021137 au
i 158.0254969604398 0.0060651 deg
node 314.844885438983 0.0073353 deg
peri 211.5180277357846 0.038853 deg
M -.01066635179544565 0.0086876 deg
tp 2460280.583701130927
(2023-Dec-02.08370113)
0.82358 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.030482055102563E-5 8.401e-06 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      74  
   data-arc span      114 days  
   first obs. used      2020-12-12  
   last obs. used      2021-04-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .28911  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-02 23:42:52  

Additional Information
 Earth MOID = 6.79392 au 
 Jupiter MOID = 2.71674 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 6.2   0.4 5 from 68 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 10.   n/a 5 autocmod 2.9c
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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