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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 2459253.5 (2021-Feb-08.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.004402435497363 0.00084593  
a -1761.77652938752 338.34 au
q 7.756107531396744 0.0019584 au
i 158.02869468 0.0030804 deg
node 314.840976539401 0.0037232 deg
peri 211.5066636518455 0.031166 deg
M -.01368569072614443 0.0039369 deg
tp 2460280.307134245845
(2023-Dec-01.80713425)
0.45729 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.332839466118056E-5 3.8394e-06 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      78  
   data-arc span      145 days  
   first obs. used      2020-12-12  
   last obs. used      2021-05-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .35948  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 19:11:02  

Additional Information
 Earth MOID = 6.79389 au 
 Jupiter MOID = 2.71672 au 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 7.156005822109247E-7 7.090719825002131E-7 -.0003445347875048286 -2.640159737264924E-6 -1.733602292203034E-5 2.189188948228222E-6
q 7.090719825002131E-7 3.835350020072759E-6 -.0007086167033931465 -5.313143420640528E-6 -5.867791083470185E-5 4.373755892694643E-6
tp -.0003445347875048286 -.0007086167033931465 .2091143316296833 .001583852256109503 .01321539799591889 -.001309589054025308
node -2.640159737264924E-6 -5.313143420640528E-6 .001583852256109503 1.386224248102272E-5 .000101224232415166 -1.146563107540346E-5
peri -1.733602292203034E-5 -5.867791083470185E-5 .01321539799591889 .000101224232415166 .0009713201924079551 -8.351126696522141E-5
i 2.189188948228222E-6 4.373755892694643E-6 -.001309589054025308 -1.146563107540346E-5 -8.351126696522141E-5 9.488791926689079E-6

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 7 from 71 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 9.25   n/a 7 autocmod 2.9c
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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