OBSERVATORIO ASTRONOMICO RAMON MARIA ALLER

INTERNATIONAL ASTRONOMICAL UNION COMMISSION 26 (DOUBLE STARS)
                  INFORMATION CIRCULAR No. 144  (JUNE 2001)                    


                                    NEW ORBITS                               

         ADS            Name      P (yr)      T       e      W(2000)      2001      Author
  RA 2000 DEC    n (deg)    a (")   i (deg)   w (deg)  Last ob.    2002      
--------------------------------------------------------------------------------------

  149                 A 802       269.52   1972.51    0.511   125.6     124.8 0.202  MASON &
00122+4647     1.3357       0.260   108.8   266.6    1991.25    124.2 0.206   HARTKOPF

                         I 260 CD     44.66   2012.84    0.740    63.3     273.9 0.560  MASON &
00315-6257     8.0609       0.404   146.9   303.7    1999.7839  271.4 0.541  HARTKOPF

  691                 A 922       106.44   2058.04    0.990   178.8     338.5 0.464  MASON &
00508+3203     3.3822       0.786    83.8   286.7    1999.731   338.6 0.467   HARTKOPF

 1865                A 2329       25.32   1988.16    0.237   108.7     130.9 0.430  ANDRADE
02278+0426    14.2180       0.559    73.3   233.2    1996.6965  139.1 0.351   

 2911                HU 27       385.26   2038.01    0.692   170.8     321.4 0.345  LING
03591+0948     0.9344       0.849    73.6   236.1    1997.07    322.5 0.348   

 3438                A 1544 AB    76.81   1961.22    0.423   125.3     205.9 0.157  DOCOBO
04475+4324     4.6869       0.159   133.5    93.6    1995.08    202.9 0.157   

                         I 345       191.0    1994.17    0.640    52.1     306.6 0.11   ALZNER &
05248-5219     1.8848       0.300   142.7    38.4    1993.09    298.8 0.12   ARGYLE

                         MLR 314      46.76   1985.61    0.564   160.7     223.6 0.164  MANTE
05378+6642     7.6989       0.251    65.4   280.0    1993.2023  229.9 0.161    

                         DUN 23      304.2    2047.34    0.592   132.4     119.5 2.60   SCARDIA
06048-4828     1.1834       3.26     73.0    87.1    1997.095   119.9 2.59    

 5042                STT 139     360.3    1929.06    0.894   183.8     255.9 0.54   SCARDIA
06256+2227     0.9992       0.674    56.6   276.3    1997.410   256.3 0.54    

 5752               A 519        45.94   2019.54    0.564   101.6     255.5 0.185  DOCOBO
07043-0303     7.8363       0.323   101.1    44.6    1997.10    251.1 0.159  & LING

 7010               A 2551       69.56   1950.27    0.706   121.6      78.1 0.191  MASON &
08486+0237     5.1754       0.165    47.4   103.1    1990.03     80.0 0.189  HARTKOPF

                        FIN 348     469.61   2443.09    0.706    90.9     320.2 0.179  MASON &
09243-3926     0.7666       0.492   121.3    12.7    1993.0955  318.2 0.187  HARTKOPF

                        COP 1        33.95   1969.68    0.433   291.0     278.1 0.566  MASON &
09307-4028    10.6038       0.862    58.0    44.3    1997.1176  290.4 0.537  HARTKOPF

 7780                HU 879       38.62   1999.15    0.668    41.5     197.9 0.082  MASON &
10279+3642     9.3216       0.363    79.1    29.8    1997.1259  210.3 0.169   HARTKOPF

 7846               BU 411      170.14   1948.39    0.765   145.1     310.6 1.337  SCARDIA
10361-2641     2.1159       0.886   128.2    37.9    1998.140   310.2 1.343    

 8048               A 676 BC     23.23   1995.22    0.119    71.7     269.1 0.301  DOCOBO
11047-0413    15.4972       0.343    62.6   111.2    1997.2682  279.5 0.266  & LING

                         COU 100      73.12   2016.11    0.754   196.1     238.8 0.154  MASON &
14459+2344     4.9234       0.297   106.4    79.6    1997.2740  235.5 0.157     HARTKOPF

                         COU 100      65.94   2013.83    0.653     8.8     229.2 0.149  MANTE
14459+2344     5.4595       0.254   110.3   254.1    1997.449   225.1 0.152    

 9730                HU 1168      88.79   1984.66    0.620   129.1     305.3 0.436  DOCOBO
15370+6426     4.0545       0.392   121.7    50.7    1997.52    304.0 0.449  & LING

 9918               FIN 384 Aa    4.95   1988.94    0.619   147.8     278.3 0.061  MASON &
16057-0617    72.7272       0.071   116.0    76.3    1996.1842  233.4 0.048  HARTKOPF

 9970                STF 2028    114.0    1992.65    0.570   145.0     129.8 0.12   ALZNER
16128+3922     3.1579       0.380    81.4   212.6    1992.22    132.8 0.15   
 
                         SEE 271      71.58   1993.89    0.682   256.3      81.3 0.303  MASON &
16193-4240     5.0293       0.383    62.3    71.4    1991.25     83.8 0.324  HARTKOPF

                        HJ 5014     450.0    1854.7     0.650    85.8       6.7 1.70   ALZNER &
18068-4325     0.8000       2.04    123.1   282.7    1999.79      6.2 1.70   ARGYLE

11979               HU 757 BC   115.9    1991.06    0.284    84.6     171.1 0.078  SCARDIA
19021+5216     3.1061       0.234   115.0   217.4    1998.679   160.2 0.081  et al. (*)

11998               A 2992       99.00   1951.17    0.835   125.9      68.4 0.223  DOCOBO
19039+2642     3.6364       0.256   114.5   255.0    1997.471    67.3 0.221  & LING

12144               A 1391      138.1    1979.71    0.396    64.4     345.6 0.15   SCARDIA
19106+5429     2.6068       0.251    50.2   175.7    1998.679   349.8 0.15   et al. (*)

12515               A 1653      245.7    1875.18    0.017   170.0     166.1 0.22   SCARDIA
19296+1224     1.4652       0.215   178.0   179.7    1998.673   164.7 0.22   et al. (*)

                         FIN 358      50.11   1976.55    0.828   178.2     118.4 0.143  MASON &
21536-1019     7.1842       0.089    31.5   117.1    1996.5348  119.7 0.144  HARTKOPF

11296              HO 566       93.91   1970.51    0.785   159.8     144.6 0.470  MASON &
18236-2610     3.8330       0.386   106.4   236.9    1991.3927  144.2 0.469  HARTKOPF

(*) SCARDIA, PRIEUR, KOECHLIN and ARISTIDI




                                  ANNOUNCEMENT


The Ramon Maria Aller Observatory at the University of Santiago de Compostela,
Spain, has completed its first Catalogue of Orbits and Ephemerides of Visual
Double Stars.  At the International Workshop held in Santiago de Compostela in
1996 it was announced that this Catalogue would be heir to the ephemerides
catalogues edited at the Nice Observatory by Muller, Meyer, and Couteau, Morel
and Fulconis; however, it has been extended to include orbits, and now lists
orbits up to the end of the year 2000.

In our orbital selection, it has been our basic criterion to not replace any
early orbit except for those reasonably improved by subsequent one.  We believe
that it will make a welcome companion to the USNO 5th Orbit Catalog, of interest
to both Commission 26 members and astronomers in general.

In all, the new Catalogue contains 1545 orbits for 1208 systems.  Each binary has
been assigned a letter (A, B or C) indicating its current status as regards the
possibility of calculating a reliable orbit.  This classification has been
carried out on the basis of the arc described, the number and nature of the
available observations, and/or whether closely similar orbits have been
calculated independently by different authors.  Notes indicate the existence of
other components of the system, whether it is also a spectroscopic binary,
whether it has an astrometric orbit, etc.

The elements of each orbit are accompanied by a reference to the original
publication, the ephemerides will be predicted within the next few years, and
letters indicating such information as the equinox to which the node is referred,
or whether the elements of the orbit as originally published were flawed by
typographical errors.  New orbits will be included as they become available.

The Catalogue may be consulted on-line via internet at
http://www.usc.es/astro/catalog

J. A. Docobo, J. F. Ling, C. Prieto, J. M. Costa, M. T. Costado & P. Magdalena
Observatorio Astronomico Ramon Maria Aller
Universidade de Santiago de Compostela
Spain


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The deadline for contributions to Information Circular No. 145 is:
     
                            October 15th 2001


         J. A. Docobo (oadoco@usc.es)
         J. F. Ling (oafana@usc.es)
         Tel. (81) 59 27 47
         Fax: (81) 59 70 54

         Observatorio Astronomico "R. M. Aller"
         P. O. Box 197
         Universidade de Santiago de Compostela
         SPAIN


ISSN: 1024-7769