Central Bureau for Astronomical Telegrams
IAUC 4693: 1988Z; 1988 XB; CH Cyg
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Circular No. 4693
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1988Z IN MCG +03-28-022
S. Heathcote, Cerro Tololo Interamerican Observatory, reports: "A
spectrum of this object was obtained on Dec. 17 by A. Cowley and D.
Hartwick using the 4.0-m telescope RC spectrograph and the 2D-Frutti
photon-counting system. This spectrum, which covers the range 376-604
nm at a resolution of 0.4 nm, shows a very blue, almost featureless
continuum, upon which are superposed narrow nebular emission lines.
The object is therefore most probably of type II, at or before maximum
light. The only feature apparent in the continuum is a broad shallow
depression running from 400 to 470 nm. Nebular lines at 497.0, 443.7,
381.1 and 511.7 nm are identified as H beta, H gamma, [O II] 372.7 nm
and [O III] 500.7 nm, respectively. This leads to a redshift for the
host galaxy of 0.022."
1988 XB
Orbital elements from MPC 14028:
T = 1988 Oct. 5.817 ET Peri. = 279.879
e = 0.47635 Node = 73.068 1950.0
q = 0.76335 AU Incl. = 3.083
a = 1.45776 AU n = 0.559981 P = 1.76 years
1988/89 R.A. (1950) Decl. Delta r V
Dec. 15 6 50.13 +27 20.9 0.175 1.151 15.3
20 6 28.39 +28 14.2
25 6 12.20 +28 40.4 0.245 1.228 15.7
30 6 00.31 +28 50.9
Jan. 4 5 51.86 +28 52.3 0.329 1.303 16.8
9 5 46.22 +28 48.6
14 5 42.91 +28 42.4 0.426 1.376 17.7
CH CYGNI
Visual magnitude estimates: July 22.90 UT, 9.0 (P. Schmeer,
Bischmisheim, West Germany); Aug. 1.8, 8.8 (A. Mizser, Budapest,
Hungary); 15.94, 8.7 (E. Schweitzer, Strasbourg, France); 28.9, 8.6
(Mizser); Sept. 11.91, 8.9 (A. Pereira, Linda-A-Velha, Portugal); 28.03,
8.7 (Schmeer); Oct. 7.98, 8.9 (Pereira); 30.92, 8.9 (Schmeer); Nov.
17.83, 8.3 (Pereira); 27.88, 8.3 (Pereira); Dec. 4.98, 7.9 (Schmeer);
15.77, 7.9 (Schmeer).
1988 December 20 (4693) Brian G. Marsden
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