Central Bureau for Astronomical Telegrams
IAUC 4284: 1986M; A0535+26; SPECTROSCOPIC Obs OF COMETS; N Cen 1986
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Circular No. 4284
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
SUPERNOVA 1986M IN NGC 7499
L. Rosino, Asiago Astrophysical Observatory, communicates that
prediscovery images of this object on plates obtained Nov. 24 and
Dec. 1 indicate mpg about 16.9 and 16.6, respectively. A CCD frame
obtained on Dec. 6 shows that the brightness is slowly decreasing.
A0535+26
F. Giovannelli, Istituto di Astrofisica Spaziale, CNR,
Frascati, and Instituto de Astrofisica de Canarias, La Laguna,
Tenerife; and V. G. Kurt and E. K. Sheffer, Space Research Institute,
U.S.S.R. Academy of Sciences, Moscow, telex: "Within the framework
of a large multifrequency campaign of coordinated observations of
the x-ray pulsar A0535+26, the Soviet station Astron has recently
made two observations in the energy range 2-25 keV; the source flux
was 0.1 Crab on Oct. 28.33 UT and 0.78 Crab on Nov. 1.33. The
corresponding pulse periods were 103.30 and 103.33 s, respectively."
SPECTROSCOPIC OBSERVATIONS OF COMETS
S. Wyckoff and S. Tegler, Arizona State University, report
spectroscopic observations, using the 4.5-m Multiple-Mirror Telescope
at the F. L. Whipple Observatory (300-750 nm; FWHM = 0.5-1.0
nm), of four comets during Nov. 28-30. Emissions of CN (0-0), C3,
and C2 were detected in comets Wilson 1986l, Sorrells 1986n, and
P/Urata-Niijima 1986o. Only CN (0-0) and C3 emissions were detected
in P/Halley 1982i, the CN-production rate being determined, from
CN column-density measurements and Festou's vectorial model, as
Q(CN) = 7 x 10E25 molecules/s. This Q(CN), at r = 4.20 AU, is 18
times greater than the preperihelion Q(CN) value obtained at r =
4.5 AU on 1985 Mar. 24.
NOVA CENTAURI 1986
Further visual magnitude estimates (cf. IAUC 4278) by R. H.
McNaught, Coonabarabran, N.S.W., reported via J. A. Mattei, AAVSO:
Dec. 5.74 UT, 5.6; 7.67, 5.1; 8.73, 5.5; 9.71, 5.8; 9.75, 5.6;
10.73, 5.5; 11.74, 5.5; 12.75, 5.7; 13.74, 5.7. Observers are
encourged to monitor, via high-speed photoelectric photometry, this
and other novae as continuously as possible for rapid fluctuations,
which reportedly occur visually on timescales of a few min or less.
1986 December 17 (4284) Daniel W. E. Green
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