Central Bureau for Astronomical Telegrams
IAUC 7666: N Cyg 2001; 2001cy; C/2001 A2
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Circular No. 7666
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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NOVA CYGNI 2001
H. Sato, National Astronomical Observatory (NAO), Tokyo,
reports the discovery of a probable nova (mag 11.9) by
Yuji Nakamura (Mie, Japan) on a Tri-X film exposed on
July 13.651 UT with a 200-mm f/4 lens. The object
was also present on CCD exposures taken with
a 0.5-m reflector by H. Fukushima, NAO, resulting in
the following magnitudes: July 16.515, V = 11.69;
16.533, I = 9.55. H. Yamaoka, Kyushu University, forwards
the following precise position for the variable by
K. Kadota from a CCD image taken on July 17.735: R.A.
= 20h07m17s.94, Decl. =
+36o04'37".2 (equinox 2000.0; twelve
GSC-ACT reference stars). Yamaoka adds that no distinct
object is visible on the Digital Sky Survey within 3"
of this position.
T. Iijima, Osservatorio Astronomico di Padova,
writes: "Optical spectra (range 430-680 nm) were taken
on July 17.9 UT using a Boller and Chivens spectrograph
mounted on the 1.22-m telescope of the Osservatorio
Astrofisico di Asiago. The spectra show
broad emission lines of H I, Fe II, and probably Na I D
and N II. Some prominent emission lines are accompanied
by P-Cyg-type absorption components. The FWHM of the
H-alpha emission component is about 950 km/s, and a
weak absorption component blueshifted by about -1200
km/s is seen. This object could be a classical nova in
the early decline stage from maximum light."
SUPERNOVA 2001cy IN UGC 11927
N. V. Borisov, V. V. Vlasuk, A. N. Burenkov, and
D. K. Klochkov, Special Astrophysical Observatory, Russian
Academy of Sciences, report that a spectrum (range 360-810
nm, dispersion 0.24 nm/pixel, S/N = 70; 15-min exposure) of
SN 2001cy (cf. IAUC 7655, 7665), obtained on July
13.03 UT with the 6-m telescope (+ long slit spectrograph +
CCD camera), shows it to be a type-II supernova. H-alpha
emission from the supernova indicates a recession velocity of
1900 km/s for the host galaxy.
COMET C/2001 A2 (LINEAR)
L. M. Woodney and D. G. Schleicher, Lowell Observatory;
and R. Greer, Wittenberg University, report narrowband gas
and dust imaging of this comet: "On June 29-30, the comet
displayed CN jet(s) symmetrical about p.a. 250 deg.
Three successive arcs separated by approximately 12 000 km were
observed on each side; outward motion of the arcs was detected.
These arcs were not observed in the dust continuum."
(C) Copyright 2001 CBAT
2001 July 18 (7666) Daniel W. E. Green
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