Central Bureau for Astronomical Telegrams
IAUC 5525: N Cyg 1992; 1955R; 1992Q, 1992S
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Read IAUC 5526
Circular No. 5525
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)
NOVA CYGNI 1992
P. Rafanelli and L. Rosino, Department of Astronomy, University
of Padua, communicate: "CCD spectra of Nova Cyg 1992 obtained
on May 13/14 at the Asiago Observatory using the 1.8-m telescope (+
Boller & Chivens spectrograph) show that the nova has already entered
the nebular stage. Besides H-alpha and H-beta, the following
lines are outstanding: [O III] 495.9-500.7 nm; [O III] 436.3 nm; [N
II] 575.5 nm; He I 706.5, 667.8, 587.6 nm; [Ne III] 386.9-396.7 nm;
and [OI] 630.0-636.4 nm. Possibly also recorded are [N II] 654.8-
658.3 nm blended with H-alpha. The average FWHM of the emission
lines is about 2200 km/s."
N. M. Ashok, T. Chandrasekhar, and S. Ragland, Physical Research
Laboratory, Ahmedabad, communicate: "Observations were made
during Mar. 17-Apr. 22 at the 0.75-m and 1-m telescopes of Vainu
Bappu Observatory, Kavalur, with an InSb photometer. The following
JHK magnitudes show a steady decline in the brightness of N Cyg
1992, which was then in an optically thin phase: Mar. 17.00 UT, J
= 4.90, H = 4.90, K = 4.65; 18.00, 4.81, 4.82, 4.52; 21.01, 4.89,
5.16, 4.67; 21.97, 5.16, 5.34, 5.01; 23.00, 5.21, 5.56, 5.10; Apr.
11.99, 6.02, 6.12, 5.83; 14.00, 5.98, 6.02, 5.84; 14.99, 6.22, 6.38,
5.88; 20.96, 5.95, 6.52, 5.94."
SUPERNOVA 1955R IN UGC 7740
J. Mueller reports her discovery of an apparent supernova of
mag about 18 in UGC 7740 (R.A. = 12h32m.2, Decl. = +49 38', equinox
1950.0), found on a Palomar Sky Survey photograph taken 1955 Apr.
24 by R. G. Harrington. SN 1955R is located 4".7 east and 27"
north of the center of the galaxy, and is slightly brighter on the
blue print than on the red one. There is no object at this position
on a red plate (limiting mag 21) taken 1992 Apr. 28 UT with
the 1.2-m Oschin telescope in the course of the second Palomar Sky
Survey by Mueller and J. D. Mendenhall.
SUPERNOVAE 1992Q AND 1992S
Mueller also notes that SNe 1992Q and 1992S (cf. IAUC 5494)
both appeared at mag 20 on red plates taken on Apr. 22 UT by C.
Brewer and Mueller and on Apr. 27 by Mendenhall and Mueller,
respectively, in the course of the second Palomar Sky Survey.
1992 May 18 (5525) Daniel W. E. Green
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