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IAUC 4605: ASM 2000+25; CH Cyg; N Oph 1988; 1988g

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                                                  Circular No. 4605
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


ASM 2000+25
     C. R. Shrader, IUE Observatory, communicates: "On May 7.6 UT one-hour
exposures of candidates A and B were made with IUE using the SWP camera.
No continuum or emission line flux was detected; we estimate 1-sigma
upper limits of 6.4 and 7.1 x 10**-14 erg cm**-2 s**-1 nm**-1 (120-190
nm) for candidates A and B, respectively.  Candidate B has been flagged
by Wagner et al. (IAUC 4600) as the likely optical counterpart of the x-
ray source.  It is unlikely that any reasonable integration time
(less than about 10 hours) with IUE would yield a useful measurement."


CH CYGNI
     P. Garnavich, University of Washington; and J. A. Mattei, AAVSO,
report that this star is fading.  Visual magnitude estimates:
Feb. 5.5 UT, 8.1 (P. Collins, Scottsdale, AZ); 10.4, 8.2 (W.
Morrison, Cavan, Ontario); 14.5, 8.3 (Collins); 19.8, 8.3
(M. Perala, Lapua, Finland); 24.5, 8.3 (Collins); 28.5, 8.7 (T.
Lazuka, Hazel Crest, IL); Mar. 5.4, 8.8 (Morrison); 16.0, 8.8
(A. Mizser, Budapest, Hungary); 21.9, 9.7 (Perala); 28.4, 8.8
(Morrison); Apr. 10.3, 8.9 (Morrison); 20.3, 8.9 (Morrison);
30.9, 8.7 (Perala); May 18.5, 8.5-9 (P. Garnavich, D. Jemers and
J. Goldader, Seattle, WA).  AAVSO data going back to 1926 indicate that
this is the faintest the star has been.  G. Wallerstein, University of
Washington, recommends radio observations in the continuum and for SiO
masers: see references Muchmore, Nuth and Stencel (1987, Ap.J. 315, L141);
Taylor, Seaquist and Mattei (1986, Nature 319, 38).


NOVA OPHIUCHI 1988
     Visual magnitudes: May 12.02 UT, 9.6 (P. Schmeer,
Bischmisheim, West Germany); 14.09, 9.9 (A. Pereira, Linda-a-Velha,
Portugal); 16.10, 10.1 (Pereira); 18.42, 9.9 (D. A. J. Seargent, The
Entrance, N.S.W.); 20.09, 9.9 (Pereira); 22.00, 9.4 (Schmeer); 24.08,
10.4 (Pereira); 25.50, 10.3 (R. H. McNaught, Coonabarabran, N.S.W.);
26.4, 10.6 (McNaught).


COMET SHOEMAKER-HOLT (1988g)
     Total visual magnitude estimates: May 20.43 UT, 12.6 (A.
Hale, Las Cruces, NM, 0.41-m reflector); 20.45, 11.9 (D. Levy,
Tucson, AZ, 0.4-m reflector); 21.46, 12.8 (C. S. Morris, Whitaker
Peak, CA, 0.26-m reflector); 24.49, 12.9 (Hale).


1988 May 28                    (4605)              Brian G. Marsden

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