Nakano Note (Nakano wa Kangaeru noda)                 NK 4545 



     C/2021 J2 (PANSTARRS)

     The following improved orbital elements, by S. Nakano, are
from 57 observations 2021 Mar. 20 to Aug. 6.  Perturbations by
Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta,
were taken into account.  The mean residual is +/- 0.21 arc second.
See an orbit in CBET 4973.


     Epoch =  2021 Sept.23.0 TT
     T     =  2021 Sept.22.49906  +/- 0.01495 (m.e.) TT 
     Peri. =  172.06341           +/- 0.00206
     Node  =   23.32945           +/- 0.00017   (2000.0)   
     Inc.  =  156.20700           +/- 0.00011
        q  =    4.7066435         +/- 0.0000453 AU
        e  =    0.9596230         +/- 0.0000627
       1/a =   +0.0085787         +/- 0.0000133 1/AU
        a  =  116.6 AU
        P  = 1259 years
    origin =   +0.009060             (Q= 7)
    future =   +0.009180


     The following residuals in seconds of arc are from the above
orbital elements:

Date  Code  Residual(")   Date  Code  Residual(")   Date  Code  Residual(") 
2021/                     210510 F51  0.2+  0.2+    210518 568  0.2+  0.1+  
210320 F51  0.3+  0.0     210511 807  0.0   0.0     210518 568  0.3+  0.1+  
210325 F51  0.2-  0.6+    210511 807  0.0   0.2+    210519 Y00  0.4+  0.5-  
210407 F51  0.0   0.1+    210511 807  0.0   0.0     210519 Y00  0.2+  0.1-  
210407 F51  0.0   0.2-    210511 568  0.3-  0.1-    210519 Y00  0.1+  0.3+  
210504 F51  0.2-  0.1-    210511 568  0.1-  0.1-    210531 F51  0.3-  0.0   
210504 F51  0.5-  0.3+    210511 568  0.2-  0.0     210531 F51  0.3-  0.1+  
210504 F51  0.0   0.1+    210511 I52  0.4+  0.2-    210531 F51  0.1-  0.0   
210504 F51  0.2-  0.2-    210511 I52  0.0   0.0     210531 F51  0.2-  0.1+  
210504 F51  0.4-  0.2+    210512 568  0.4-  0.1-    210607 F51  0.2+  0.2+  
210504 F51  0.3-  0.0     210512 568  0.3-  0.0     210607 F51  0.3-  0.1+  
210504 F51  0.0   0.1+    210512 568  0.3-  0.1-    210607 F51  0.3+  0.2+  
210504 F51  0.3-  0.2+    210516 F51  0.1-  0.0     210706 568  0.2-  0.0   
210510 G96  1.2+  1.0-    210516 F51  0.1+  0.1-    210706 568  0.2-  0.0   
210510 G96  0.7+  0.0     210516 F51  0.2+  0.5-    210706 568  0.2-  0.0   
210510 F51  0.1-  0.1-    210516 F51  0.0   0.1-    210806 568  0.0   0.0   
210510 F51  0.1+  0.0     210518 H06  0.2+  0.3-    210806 568  0.0   0.0   
210510 F51  0.2+  0.1-    210518 H06  0.1-  0.0     210806 568  0.0   0.0   
210510 F51  0.2-  0.1-    210518 568  0.2+  0.0                             
210510 F51  0.1+  0.2+    210518 568  0.1-  0.2+                            

                                          ( ) -------- Rejected Obs.

Associate of the CBAT
Syuichi Nakano                                       2021 Sept. 27

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