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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 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.004400687347003 0.00084583  
a -1762.483550371458 338.57 au
q 7.756139059420692 0.0019576 au
i 158.028712466424 0.0030801 deg
node 314.8409549294902 0.0037229 deg
peri 211.5062662124144 0.031158 deg
M -.01367741570590993 0.0039356 deg
tp 2460280.304070093022
(2023-Dec-01.80407009)
0.45724 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.332037542923923E-5 3.8382e-06 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      82  
   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      .351  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-31 22:42:58  

Additional Information
 Earth MOID = 6.79392 au 
 Jupiter MOID = 2.71674 au 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 7.154233669856275E-7 7.092772337523199E-7 -.0003444943278790789 -2.639895279480042E-6 -1.733677279904907E-5 2.188932034445526E-6
q 7.092772337523199E-7 3.832184583269272E-6 -.0007083283334842265 -5.311035422028523E-6 -5.863845008954206E-5 4.372019848706003E-6
tp -.0003444943278790789 -.0007083283334842265 .20906673433476 .001583515725719135 .01321115087017939 -.00130929760865647
node -2.639895279480042E-6 -5.311035422028523E-6 .001583515725719135 1.385985939673332E-5 .0001011935090522539 -1.146356829096111E-5
peri -1.733677279904907E-5 -5.863845008954206E-5 .01321115087017939 .0001011935090522539 .0009708083003775739 -8.348553926635095E-5
i 2.188932034445526E-6 4.372019848706003E-6 -.00130929760865647 -1.146356829096111E-5 -8.348553926635095E-5 9.487003177114712E-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 6 from 75 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 9.25   n/a 6 autocmod 2.9c
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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