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IAUC 5451: N Sgr 1992; 1992 AD; N Mus 1991; P/SCHWASSMANN-WACHMANN 1

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IAUC number

                                                  Circular No. 5451
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

     William Liller, Vina del Mar, Chile, and Paul Camilleri, Cobram,
Victoria, report their independent discoveries of an apparent nova
on photographs taken on Tech Pan film (+ orange filter, with
Problicom) and on T-Max 400 film, respectively.  The position (equinox
1950.0) is given by Liller as R.A. = 18h06m.8, Decl. = -25 51' and
by Camilleri as R.A. = 18h06m.5, Decl. = -25 52'.  Available magnitude
estimates:  Feb. 6.739 UT, [10 (Camilleri); 7.35, [10 (Liller);
13.35, 7.0 (Liller; 2 photos); 13.743, 7.5 (Camilleri).

1992 AD
     M. W. Buie, S. J. Bus, and B. A. Skiff, Lowell Observatory,
report that R-band CCD photometry obtained with the 1.1-m and 1.8-m
reflectors at Anderson Mesa on Jan. 25, 26, Feb. 1, and 5 UT shows a
double-peaked rotational light curve with a period of 9.996 +/-
0.030 hr and total amplitude of 0.17 mag.  The depths of the two
minima are asymmetric, but the maxima are nearly equal.

     P. C. Schmidtke and A. P. Cowley, Arizona State University,
report: "Observations obtained at Cerro Tololo Interamerican Observatory
show ellipsoidal variations in Nova Mus 1991 (IAUC 5161, 5165),
with mean V about 20.6 (close to pre-outburst magnitude).  CCD V and
R photometry during 1991 Dec. 1-5 and 1992 Feb. 2-5 UT reveals a
double-peaked light curve, having two unequal maxima and minima with
a period of about 8.5 hr.  An alternate period of about 10.4 hr is
closer to the 10.5-hr 'superhump' period found near maximum light
(IAUC 5259), but does not fit our photometry as well.  Phasing the
data from 1992 Feb. and 1991 Dec. (when the source was 0.2 mag
brighter) gives P = 0.3556 day and a time of deeper minimum as Feb.
4.282.  Spectra obtained in February show a stellar-like continuum,
with no strong emission lines."

     H. Mikuz, Ljubljana, Slovenia, reports that CCD exposures with
a 0.19-m flat-field camera taken on Feb. 7.846-7.944 and 8.817 UT
show the comet as having a condensation of diameter 42" and mag
about 13 with no trace of coma.

1992 February 14               (5451)             Daniel W. E. Green

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