Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5961: 1994I; PECULIAR Var IN Sgr

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 5960  SEARCH Read IAUC 5962

View IAUC 5961 in .dvi or .ps format.
IAUC number

                                                  Circular No. 5961
Central Bureau for Astronomical Telegrams
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

     Several independent reports have been received of the discovery of a
supernova some 14" east and 12" south of the nucleus of NGC 5194 = = M51:
Apr. 2.17 UT, mag 13.5 (Tim Puckett and Jerry Armstrong, Atlanta, GA; CCD
discovery; R.A. = 13 27 47.62, Decl. = +47 26 59.1, equinox 1950.0);
2.19, 13.7 (Wayne Johnson and Doug Millar, Anza, CA; visual discovery with
CCD confirmation); 2.21, - (Richard Berry, Cedar Grove, WI; CCD discovery);
2.66, 13.8 (Reiki Kushida, Yatsugatake South Base Observatory; visual).
M. W. Richmond and A. V. Filippenko have confirmed the object using BVRI
CCD images obtained with the 0.5-m Berkeley Automatic Imaging Telescope at
Leuschner Observatory and note it to be very blue.  L. Armus and J. M.
Mazzarella obtained moderate-dispersion spectra with the 5-m Hale reflector
at Palomar Observatory and see broad undulations superposed on a generally
featureless continuum.

     On Mar. 28 T. Hirayama, National Astronomical Observatory, Tokyo,
reported the discovery by M. Wakuda (Ryuyu, Shizuoka) on Mar. 14.825
UT of an object of mag about 10.7 (T-Max 400 film, green filter) at R.A.
= 18h51m43s, Decl. = -19d45'.9 (equinox 1950.0, uncertainty 10").
T. Kato, Kyoto University, reports that M. Yamamoto (Okazaki, Aichi)
has photographic records showing the object's apparent variability over
mag 10.5-11.5 (PO0 filter) since 1993 Mar. 29 but no earlier detection (and
no brighter than mag 12.5 through 1992, according to Wakuda).  Preliminary
reduction of photometry by A. C. Gilmore at Mt. John Observatory on
1994 Mar. 30.72 UT gives V = 10.61, U-B = -0.23, B-V = +0.50, V-R = +0.35,
V-I = +0.60 (uncertainty generally +/- 0.05 but up to +/- 0.1 in U-B).

     E. K. Grebel, European Southern Observatory; and H. W. Duerbeck,
Astronomical Institute, Munster, report spectroscopic observations
on Mar. 30.4 with the ESO/MPI 2.2-m telescope and EFOSC-II.  A
low-resolution spectrum (range 340-920 nm, resolution 0.84 nm) shows
emission lines of H alpha, H beta and the infrared Ca II (2) triplet,
superimposed on a somewhat veiled late-K-giant continuum.  A
high-resolution spectrum (range 352-547 nm, resolution 0.19 nm)
shows the Ca II H and K lines in absorption, as well as narrow
(FWHM less than +/- 250 km/s) emission lines of H beta and Fe II lines
(multiplets 41, 42, 48 and 49).  The absence of blueshifted absorption
lines and the narrowness of the emission lines suggest that the object
is a symbiotic nova in a slightly progressed state.

1994 April 2                   (5961)              Brian G. Marsden

Read IAUC 5960  SEARCH Read IAUC 5962

View IAUC 5961 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!