COMMISSIONS 27 AND 42 OF THE IAU 
          INFORMATION BULLETIN ON VARIABLE STARS 
                       Number 3723 

                                         Konkoly Observatory 
                                         Budapest 
                                         5 May 1992 

                                         HU ISSN 0374 - 0676 
 
 
 
               A NEW VARIABLE IN AQUARIUS 
 
 
  While conducting an observing program directed toward the study and 
determination of the synodic rotational periods of minor planets, it was 
noticed that one of the comparison stars varies about 0.3 magnitudes (V) 
almost in two hours. Since this star is not listed in neither the GCVS nor 
the NSV catalogues, I conclude that its variability has not been previously 
reported. 
  Additional differential BV photometry was obtained using a cooled 
photon-counting photometer equipped with an RCA 31034A photomultiplier tube 
attached to the 0.76m reflector at the Estacion de Altura "Dr. Carlos U. 
Cesco" of Felix Aguilar Observatory on the nights of September 8, 1991 and 
November 12, 1991. 


                                [FIGURE 1]
 
             Table I 
 
GSC                 R.A.  (1950)  DEC 
 
5198.00659   21h  18m   48.735s   -3d 22' 22.663"  variable 
5199.00616   21   20     7.775    -3   8  49.470   comparison 
5199.00693   21   20    15.014    -3   8  17.191   check star 
 
             Table II 
 
JD                V           B-V 
 
8507.5854       10.074m     +0.658m 
8507.6005        9.925       0.625 
8507.6151        9.843       0.632 
8507.6359        9.790       0.626 
8507.6504        9.952       0.632 
8572.5764        9.835       0.734 
8572.5849        9.816       0.745 
8572.5924        9.777       0.755 
8572.6035        9.748       0.754 
8572.6096        9.713       0.779 
8572.6175        9.709       0.766 
 
 
 
   Another comparison star selected for the additional photometry (V = 
9.953, B-V = 1.518) was standardized using standard stars of the Selected 
Area 113 (Landolt 1973, 1983). The standard error about the mean in V and 
B-V for the comparison star was 0.012 and 0.020 magnitude respectively. 
Table I gives the astrographic information (equinox 1950) of these stars 
which was obtained from the Hubble Space Telescope Guide Star Catalogue (CD 
ROM Version 1) using the Pickles Software Package (v3.058) (McCartney et 
al., 1989) and Figure I is the finder chart for the new variable. Table II 
shows the V and B-V values obtained. 
   This star seems to be variable in both V and B-V, and showed a tendency 
towards reddening in the November 12 observing night. A period search 
seems to be useless at this stage, so nothing can be said about the type of 
variability. 

 
                          R. GIL HUTTON 
 
                          Felix Aguilar Observatory 
                          and Yale Southern Observatory 
                          Av. Benavidez 8175 Oeste 
                          5413-Chimbas-San Juan 
                          Argentina 
 
 
References: 
Landolt, A.U.: 1973, Astron. J. 78, 959.  [BIBCODE 1973AJ.....78..959L ]
Landolt, A.U.: 1983, Astron. J. 88, 439.  [BIBCODE 1983AJ.....88..439L ]
McCartney, J., McArthur, B.E. and Jefferys, W.H.: 1989, Pickles Software 
  Package.