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IAUC 6527: 1996cb; N Aql 1995; C/1996 P2

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                                                  Circular No. 6527
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1996cb IN NGC 3510
     Q. Qiao, W. Li, Y. Qiu, and J. Hu, Beijing Astronomical
Observatory (BAO), report their independent discovery of SN 1996cb;
their unfiltered CCD images yield the following magnitudes: Nov. 29
UT, [19.0: (limiting magnitude of CCD frame); Dec. 18.92, about
15.9; 19.77, 15.6.  A low-resolution, high-quality spectrogram
(0.48 nm/pixel, range 400-800 nm) taken with the 2.16-m BAO
telescope by D. W. Xu, J. M. Bai, G. W. Cha, and Q. Y. Qiao on Dec.
19.85 confirms SN 1996cb to be a type-II supernova (cf. IAUC 6524);
the Balmer lines show strong P-Cyg profiles with expansion
velocities of 12 600 (H-alpha), 7850 (H-beta), and 7210 km/s (H-
delta); Na I 589.3-nm and He I 587.6-nm lines also show P-Cyg
profiles with expansion velocities of 6670 km/s.  The spectrum is
similar to that of SN 1996W, two weeks past maximum (on Apr. 29).


NOVA AQUILAE 1995
     A. Retter, E. M. Leibowitz, and O. Kovo-Kariti, Wise
Observatory, Tel Aviv University, write:  "We performed CCD
photometry of N Aql 1995 through an I filter during 3 nights in
1995 and 18 nights in 1996.  Time-series analysis of the 1996 data
reveals two periodicities in the light curve: 0.060054 +/- 0.000004
(which appears with its first harmonic) and 0.2558 +/- 0.0001 day,
both with full amplitudes of about 0.015 +/- 0.005 mag.  We cannot
rule out that the 1-day aliases at 0.0639 and 0.2037 or 0.3438 day
are the true periods.  We suggest an intermediate-polar model as an
interpretation for the two periods, with the longer one as the
orbital period of the binary system."


COMET C/1996 P2 (RUSSELL-WATSON)
     Ephemeris extension to IAUC 6488 (orbital elements MPC 28557):

1996/97     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec. 23     1 00.63   -26 22.8   3.744   3.886   90.9   14.7   14.8
Jan.  2     1 05.18   -24 33.7   3.957   3.971   83.7   14.2   15.0
     12     1 10.80   -22 45.8   4.170   4.057   76.6   13.6   15.2
     22     1 17.31   -21 00.3   4.382   4.143   69.6   12.9   15.4
Feb.  1     1 24.52   -19 18.3   4.588   4.229   62.8   12.0   15.6
     11     1 32.32   -17 40.6   4.788   4.315   56.1   10.9   15.8
     21     1 40.57   -16 07.8   4.977   4.400   49.5    9.8   15.9
Mar.  3     1 49.16   -14 40.3   5.156   4.486   43.3    8.7   16.1

                      (C) Copyright 1996 CBAT
1996 December 23               (6527)            Daniel W. E. Green

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