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IAUC 4670: V CrA; ASM 2000+25; 1987g; N LMC 1988 No. 2

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                                                  Circular No. 4670
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


V CORONAE AUSTRINAE
     W. A. Lawson, P. M. Kilmartin, and A. C. Gilmore, Mount John
University Observatory, report preliminary photometry of a decline
in brightness of this R CrB-type star:  Oct. 5.49 UT, V = 10.02,
B-V = +0.71; Oct. 21.36, 10.53, +0.73; Oct. 30.37, 11.04, +0.76.


ASM 2000+25
     P. A. Charles, Royal Greenwich Observatory, La Palma; and M.
Kidger, Instituto de Astrofisica de Canarias, Tenerife, report:  "We
have discovered an optical modulation in the counterpart of the
x-ray nova ASM 2000+25 (cf. IAUC 4600, 4609) at a period of 7.0 +/-
0.5 hr.  This is based on 129 R-band and 36 Johnson-V CCD images
obtained with the 1-m Jacobus Kapteyn Telescope on La Palma during
the period July 29-Aug. 4.  A modulation was also seen in
data obtained with the same configuration on Oct. 18.  The mean R
magnitude was 15.9 in July and Aug. and 17.7 in Oct., with the modulation
at a level of 0.15-0.20 mag and sinusoidal in Aug., somewhat less in
Oct.  This period is remarkably close to that of the orbital period
of V616 Mon = A0620-00 and a search for an x-ray modulation at this period is
urgent.  Optical spectroscopy in a search for the secondary star
should go ahead when the nova has reached quiescence, probably around
the middle of next year."


PERIODIC COMET TEMPEL 2 (1987g)
     Total visual magnitude estimates (cf. IAUC 4656):
Sept. 29.77 UT, 8.7 (R. Haver, Rome, Italy, 15x80 binoculars);
Oct. 9.10, 8.0 (R. Keen, Mt. Thorodin, CO, 8x40 binoculars);
14.08, 9.1 (G. R. Chester, Rixeyville, VA, 0.2-m reflector);
28.08, 9.5 (A. Hale, Las Cruces, NM, 0.41-m reflector);
31.11, 9.2 (C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector).


NOVA IN THE LARGE MAGELLANIC CLOUD 1988 No. 2
     Visual magnitude estimates (cf. IAUC 4666) by R. H. McNaught,
Siding Spring Observatory: Oct. 20.45 UT, 12.9; 20.69, 13.0;
21.73, 13.2; 23.74, 13.3; 28.50, 13.4.


1988 November 1                (4670)             Daniel W. E. Green

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