OAA computing section circular                        NK 587 



           07S1-0180Periodic Comet Helin-Roman-Alu 107S1-0120




     The following  improved  orbital  elements,06F1-001 by S. Nakano,06F1-000 are
from 17 observations  1988 Aug. 10  to 1989 Dec. 1.  Perturbations
by all nine planets and five minor planets were taken into account.
The mean residual is +/- 0.82 arc second.


06F1-001     Epoch =06F1-000  1987 Oct. 12.006F1-001 TT06F1-000
06F1-001     T     =06F1-000  1987 Oct. 12.45330  +/- 0.0828306F1-001 (m.e.) TT 06F1-000
06F1-001     Peri. =06F1-000  216.32239           +/- 0.04816
06F1-001     Node  =06F1-000   73.50543           +/- 0.0458006F1-001   (2000.0)   06F1-000
06F1-001     Inc.  =06F1-000    9.76139           +/- 0.00960
06F1-001        q  =06F1-000    3.7066249         +/- 0.000604606F1-001 AU06F1-000
06F1-001        e  =06F1-000    0.1738941         +/- 0.0001291
06F1-001        a  =06F1-000    4.4868642         +/- 0.000210006F1-001 AU06F1-000
06F1-001        nß =06F1-000    0.10370261        +/- 0.00000728
06F1-001        P  =06F1-000    9.504             +/- 0.000667206F1-001 years06F1-000
                                 (+/- 0.2406F1-001 day06F1-000)



     The predicted orbit for the 1997 return is as follows:

06F1-001T     =06F1-000 1997 Mar. 27.9019006F1-001 TT  06F1-00006F1-001     Epoch =06F1-000  1997 Mar. 13.006F1-001 TT06F1-000
06F1-001Peri. =06F1-000 215.07851               06F1-001        e =06F1-000    0.1759658
06F1-001Node  =06F1-000  73.4759706F1-001    (2000.0)           a =06F1-000    4.507225706F1-001 AU06F1-000
06F1-001Inc.  =06F1-000   9.74275                       06F1-001nß=06F1-000    0.10300069
06F1-001    q =06F1-000   3.714108006F1-001 AU                  P =06F1-000    9.56906F1-001 years06F1-000


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

06F1-001Date/ UT           R.A. (2000)   Decl.         *** O-C ***   Code/Obs06F1-000
06F1-001                     h  m  s       ¡  ,  "       "      "            06F1-000
1988 08 10.38003   23 03 27.86  -19 55 02.6     1.5+   1.2-   675/PL  
1988 08 10.40104   23 03 27.11  -19 55 06.8     0.3-   0.4+   675/PL  
1988 08 12.38733   23 02 29.27  -20 04 11.8     1.2-   0.8+   675/PL  
1989 09 07.44097   02 12 31.31  +03 34 04.0     0.7-   0.1-   675/PL  
1989 09 07.46267   02 12 31.08  +03 34 01.8     0.5+   0.3+   675/PL  
1989 09 08.40538   02 12 18.02  +03 32 02.3   ( 3.0-   2.7-)  675/PL  
1989 10 02.41510   02 02 59.45  +02 32 08.4     0.7+   0.1-   675/PL  
1989 10 02.43698   02 02 58.73  +02 32 03.5     0.4+   1.4-   675/PL  
1989 10 05.41545   02 01 24.17  +02 23 57.9   ( 3.3+   2.6-)  675/PL  
1989 10 06.33941   02 00 53.85  +02 21 25.8   ( 0.4+   5.1-)  675/PL  
                                                                      
1989 10 06.37483   02 00 52.63  +02 21 21.3   ( 0.1+   3.9-)  675/PL  
1989 10 08.71797   01 59 34.52  +02 15 12.5     0.8+   0.9+   413/SS  
1989 10 10.74666   01 58 25.59  +02 09 50.8   ( 3.9+   0.5+)  413/SS  
1989 10 20.55803   01 52 38.61  +01 45 35.2     0.6+   0.2-   413/SS  
1989 10 23.60556   01 50 49.13  +01 38 47.0     0.0    1.0-   372/sk  
1989 10 23.69028   01 50 46.00  +01 38 37.6     0.3-   0.4+   372/sk  
1989 10 25.28091   01 49 48.89  +01 35 17.6   ( 2.9-   0.1+)  801/HO  
1989 10 26.25260   01 49 14.50  +01 33 19.3     0.9-   1.0-   675/PL  
1989 10 28.23750   01 48 04.11  +01 29 31.2     1.8-   0.4+   675/PL  
1989 10 29.18343   01 47 30.89  +01 27 48.0     0.3-   1.7+   801/HO  
                                                                      
06F1-00107S1-0120                           - continued -06F1-000


06F1-00107S1-0180P/Helin-Roman-Alu 1                    NK 587 - 206F1-00007S1-0120
-------------------------------------------------------------------------



06F1-001Date/ UT           R.A. (2000)   Decl.         *** O-C ***   Code/Obs06F1-000
06F1-001                     h  m  s       ¡  ,  "       "      "            06F1-000
1989 10 29.22082   01 47 29.55  +01 27 42.7     0.3-   0.5+   801/HO  
1989 10 31.68194   01 46 04.22  +01 23 28.5   ( 3.1+   0.1-)  372/sk  
1989 11 29.19514   01 33 07.95  +01 10 08.9     1.0+   0.7-   675/PL  
1989 12 01.15521   01 32 35.01  +01 11 55.0     0.4+   0.3+   675/PL  
                                                                      
                                          ( ) -------- Rejected Obs.


Director, Computing Section
Syuichi Nakano                                       1992 Dec. 1206F

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