Central Bureau for Astronomical Telegrams
IAUC 5535: NGC 5548; 1986 III; N Sco 1992
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Read IAUC 5536
Circular No. 5535
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
NGC 5548
S. Mathur and O. Kuhn, Harvard-Smithsonian Center for Astrophysics,
communicate: "Following the reports by Iijima (IAUC 5521)
and Penfold (IAUC 5533) that the broad emission lines of Seyfert
1.5 galaxy NGC 5548 were no longer visible on May 5, 11, and 12, we
obtained a spectrogram of the object only 10 days later, on May 22,
with the Multiple Mirror Telescope (red channel, range about 400-
800 nm, resolution about 1.2 nm). Strong, broad emission lines
were clearly present (FWHM for H-alpha and H-beta being 10.1 and
4.7 nm, corresponding to 4538 and 2860 km/s, respectively). The
continuum flux level was 4.07 x 10E-15 erg cmE-2 sE-1 AE-1 (V =
14.9). The galaxy seems to have returned to its normal state of
activity."
PERIODIC COMET HALLEY (1986 III)
R. M. West, European Southern Observatory, reports: "A
combined frame with a total of 130 min exposure, obtained in the
standard V-band with the ESO 3.5-m New Technology Telescope by A.
Smette and O. Hainaut on Apr. 6.16 UT, does not convincingly show
this object at heliocentric distance 16.2 AU. A very faint image
at the astrometric position predicted by B. G. Marsden, from a new
ephemeris based on positions measured by R. West from frames
obtained in 1991 Feb.-Mar. with the Danish 1.54-m telescope, has V =
25.8 +/- 0.4. Since the predicted nuclear magnitude is 25.95, this
indicates that the dust cloud ejected at the time of the outburst
in late 1990 has now dispersed."
NOVA SCORPII 1992
A. C. Gilmore provides the following photometry obtained with
the 0.6-m Cassegrain telescope at Mt. John University Observatory
(+/- 0.01 unless otherwise noted): May 30.70 UT, V = 8.97, B-V =
+1.15, U-B = +0.22 +/- 0.02, V-R = +0.93, V-I = +2.07 +/- 0.03;
31.613, 9.03, +1.08, +0.12 +/- 0.02, +0.94, +2.02 +/- 0.05.
W. Liller, Vina del Mar, Chile, reports the following magnitudes
from tech pan exposures (the first two with an orange filter):
Apr. 6 UT, [11.5; June 1.03, 8.6 (independent discovery);
2.19, 9.0. Visual magnitude estimate by R. Donner, Santa Barbara,
CA: June 3.32 UT, 9.0.
1992 June 5 (5535) Daniel W. E. Green
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