Nakano Note (Nakano wa Kangaeru noda)                 NK 3330 



     P/2016 A3 (PANSTARRS)

     The following improved orbital elements, by S. Nakano, are
from 48 observations 2016 Jan. 4 to Dec. 13.  Perturbations by
Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta,
were taken into account.  The mean residual is +/- 0.33 arc second.
See an orbit in HICQ 2016.


     Epoch =  2017 Mar. 28.0 TT
     T     =  2017 Apr. 13.86686  +/- 0.07074 (m.e.) TT 
     Peri. =  338.50455           +/- 0.00852
     Node  =  187.79283           +/- 0.00046   (2000.0)   
     Inc.  =    8.59419           +/- 0.00005
        q  =    4.7891023         +/- 0.0001031 AU
        e  =    0.3798894         +/- 0.0000249
        a  =    7.7229809         +/- 0.0000456 AU
        n' =    0.04592262        +/- 0.00000041
        P  =   21.462             +/- 0.0001899 years
                                 (+/- 0.07 day)


     The predicted orbit for the 2039 return is as follows:

T     = 2039 June 21.01035 TT       Epoch =  2039 June 21.0 TT
Peri. = 351.18887                       e =    0.3689982
Node  = 179.35409    (2000.0)           a =    7.5574140 AU
Inc.  =   9.12145                       n'=    0.04743995
    q =   4.7687416 AU                  P =   20.776 years


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

Date  Code  Residual(")   Date  Code  Residual(")   Date  Code  Residual(") 
2016/                     160107 F51  0.1-  0.1-    160204 J22  1.3-  0.6+  
160104 F51  0.0   0.1+    160107 Q62  0.2-  0.1-    160204 J22  1.5-  0.1+  
160104 F51  0.0   0.0     160107 Q62  0.2-  0.1+    160212 F51  0.0   0.1+  
160104 F51  0.0   0.1+    160107 Q62  0.2+  0.1-    160212 F51  0.0   0.1+  
160104 F51  0.1-  0.0     160110 E07  0.1-  0.0     160212 F51  0.0   0.0   
160105 568  0.1+  0.1-    160110 E07  0.4-  0.0     160212 F51  0.0   0.1+  
160105 568  0.2+  0.1-    160112 F51  0.0   0.1-    160228 W55  0.6+  0.0   
160105 568  0.1+  0.1-    160112 F51  0.1+  0.0     160228 W55  0.2+  0.4-  
160106 H21  0.2-  0.1-    160112 F51  0.1+  0.1-    160310 215  0.5+  0.4+  
160106 H21  0.2-  0.2-    160113 G45  0.5-  0.2+    160310 215  0.5+  0.4+  
160106 H21  0.2-  0.2-    160113 G45  0.5-  0.2+    160310 215  0.7+  0.6+  
160106 O75  0.6-  0.9+    160113 G45  0.0   0.8+    161204 G96  1.1-  0.2+  
160106 O75  0.4-  1.2+    160113 G45  0.2+  0.1+    161204 G96  1.3-  0.8+  
160106 O75  1.0-  0.1-    160129 703 (2.3+  0.1+)   161204 G96  1.1-  0.5+  
160107 F51  0.0   0.1-    160129 703  1.1+  0.3-    161213 F51  0.1+  0.1+  
160107 F51  0.0   0.1-    160129 703 (4.1-  0.7+)   161213 F51  0.1+  0.1-  
160107 F51  0.0   0.1+    160204 J22  0.7-  0.3+    161213 F51  0.1+  0.2-  

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

Associate of the CBAT
Syuichi Nakano                                       2017 Feb. 8

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