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IAUC 5526: Prob. N IN Sco; N Cyg 1992

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                                                  Circular No. 5526
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     Paul Camilleri, Cobram, Victoria, reports his discovery of
what appears to be a nova at R.A. = 17h03m.9, Decl. = -43 12'
(equinox 1950.0).  The following magnitude estimates are by
Camilleri unless otherwise noted, and all are photovisual except
for those on May 24 (which are visual):  Apr. 28.600 UT, [12; May
22.492, 8.2; 23.511, 8.3; 24.371, 8.3 (P. Williams, Heathcote,
N.S.W.); 24.425, 8.4.

     G. M. Hurst, The Astronomer, reports that inspection of 0.5-
day means of visual data of Nova Cyg 1992 taken by The Astronomer
Group are suggestive of an about 2.5- or 5-day periodicity
postmaximum. Subsequent periodicity analysis by M. Kidger (Instituto
de Astrofisica de Canarias), using the Jurkevich method, of > 400
visual data points in The Astronomer Group archive supports a 4.7-
day period with regular minima of amplitude 0.3 mag, and Kidger
notes:  "There is also some evidence of a possible intermediate
shallow secondary minimum.  Analysis of all available V-band photometric
data from IAUCs, The Astronomer Group, and Agrupacion Astronomica
de Tenerife shows regular oscillations in the light curve
until late April.  Periodicity analysis gives a best period of 4.6
+/- 0.2 days.  There are insufficient data to define the mean light
curve form, but the photometric amplitude agrees with that from the
visual data.  These oscillations are similar to those of V1668 Cyg
= N Cyg 1978 (Campolonghi et al. 1980, A.Ap. 85, L4), but are
considerably slower.  No obvious color variations are seen with this
period.  Since t3, which was 47 days, the oscillations have
apparently disappeared."
     Photometry by B. Dintinjana and H. Mikuz obtained with the
0.25-m Schmidt-Cassegrain telescope (+ CCD) at the the University
of Ljubljana Astronomical Observatory:  May 9.103 UT, V = 8.46 +/-
0.01, B-V = -0.34 +/- 0.03, V-R = +1.21 +/- 0.02 (comparison star
HR 7730); May 14.083, 8.43, -0.35, +1.10 (comparison star HD 195664).
     Further visual magnitude estimates:  May 6.40 UT, 8.4 (G. W.
Kronk, Troy, IL); 13.88, 8.0 (E. Schweitzer, Strasbourg, France);
16.99, 8.3 (B. H. Granslo, Fjellhamar, Norway); 20.96, 8.3
(Granslo); 23.19, 8.4 (W. G. Dillon, Missouri City, TX); 24.46, 8.4
(A. Jones, Nelson, N.Z.).

1992 May 24                    (5526)            Daniel W. E. Green

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