COMMISSIONS 27 AND 42 OF THE IAU
            INFORMATION BULLETIN ON VARIABLE STARS
                         Number 3888

                                                  Konkoly Observatory
                                                  Budapest
                                                  2 June 1993

                                                  HU ISSN 0374 - 0676


          18 ADDITIONAL HISTORICAL OUTBURSTS OF THE
                CATACLYSMIC VARIABLE J05.23


The dwarf nova J05.23 was discovered in an objective-prism photographic survey
by Maza et al.  (1992), at which time it was at or near minimum.  Wenzel (1993)
inspected plates in the Sonneberg Sky Patrol collection from 1928 to 1983, and
found one distinct outburst.

A search of more than 700 plates, 1888-1989, from the Harvard College
Observatory's collection (most of the plates searched were taken in the
interval 1930-1952), has revealed 18 additional outbursts of J05.23.  Rough
B-magnitudes during outburst are derived from a sequence based on fields S501
and S569 from The Guide Star Photometric Catalog (Lasker et al.  1988).  In the
table below are given the Julian Date and B-magnitudes corresponding to each
outburst, as well as magnitude limits for dates when the star could not be
seen, where these observations serve to impose a meaningful limit on outburst
duration.  A (2) following a magnitude indicates it is the mean of two
observations for that date.

J.D.    B mag    J.D.    B mag      J.D.    B mag   J.D.    B mag
18734   >12.5    26130   >14.9      28995   >14.9   44728   >14.9
18748    12.1    26147   12.4       29017    12.8   44748    12.5
18764   >12.5    26158   14.3       29020   >14.9
                                                    46178   >14.9
20511   >13.7    26505   >14.9      30157   >14.9   46195    13.2
20547    12.4    26531   12.5(2)    30159    13.7   46209   >14.9
20593   >13.7                       30162    12.5
                 27093   >14.9      30163    12.2   47317   >13.7
21338   >12.5    27162   13.7                       47327    13.2
21348    13.4    27194   >13.7      31643   >13.7   47349   >13.7
21361   >12.5                       31655    12.1
                 27870   >12.5                      47570   >13.7
23503    12.5    27890   12.5       32262   >13.7   47590    13.2
23526   >13.7    27891   >12.5      32286    14.3   47616   >14.9
                 27901   >14.9      32287    12.2
25411   >14.9                       32315   >13.7
25418    13.0    28302   >13.7
25433   >13.7    28304   12.3(2)
                 28314   13.6(2)
                 28330   <14.9



                       MARTHA L. HAZEN
                       Harvard-Smithsonian Center for Astrophysics
                       Cambridge, MA 02138, U.S.A.

References:

Lasker, B. M., Sturch, C. R., Lopez, C., Mallama, A. D., McLaughlin, S.
   F., Russell, J. L., Wisniewski,
   W. Z., Gillespie, B. A., Jenkner, B., Siciliano, E.D., Kenny, D., Baumert,
   J.B., Goldberg, A.M., Henry, G.W., Kemper, E., and
   Siegel, M.: 1988, Ap.J.Suppl., 68, 1. [BIBCODE 1988ApJS...68....1L ]
Maza, J., Gonzales, L.E., Wischnjewsky, M., and Barrientos, F.: 1992, P.A.S.P.,
   104, 1060. [BIBCODE 1992PASP..104.1060M ]
Wenzel, W.: 1993, I.B.V.S., No. 3829.