Central Bureau for Astronomical Telegrams
IAUC 5260: N LMC 1991; 1991f
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Circular No. 5260
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
NOVA IN THE LARGE MAGELLANIC CLOUD 1991
M. Della Valle, European Southern Observatory, reports: "Analysis
of flux-calibrated spectra (range 370-900 nm, resolution about
1.5 nm) obtained by P. Leisy on May 6.15 UT with the 3.6-m telescope
(+ EFOSC) at La Silla, shows this to be a nova during its pre-nebular
stage ('4640 phase'). The spectrum is dominated by the Balmer
emission lines H-alpha (FWHM about 2500 km/s), H-beta (about 2100
km/s), H-gamma (about 2150 km/s), H-delta (about 2350 km/s), and H-
epsilon (about 2200 km/s), and also by the prominent blend at 464.5
nm (N III + C III). Broad emissions are also visible at 492.4,
501.8, 516.9 (Fe II multiplet 42), 531.7 (Fe II mult. 48), 575
(blend O I + [N II]), and 630.0-636.4 nm ([O I]). In the near-
infrared region, the emissions at 777.5 (O I mult. 1) and 844.6 nm
(O I mult. 4) stand out, whereas the 706.5-nm (He I), and 823-nm
(O I mult. 34) lines appear still weak."
R. H. McNaught, Anglo-Australian Observatory, reports the
following photographic magnitudes obtained from U.K. Schmidt Telescope
(UKST) J plates taken by A. Savage, M. Hartley, and S. M. Hughes and
from Tech Pan film exposures by G. Garradd, Tamworth, N.S.W. (G):
Mar. 12.43 UT, [20.5 (UKST); 21.48, [19 (UKST); Apr. 12.41, 19.7:
(UKST); 15.40, [15 (G); 16.40, 14.9 (UKST); 16.44, 14.5 (G); 20.40,
11.6 (UKST); 20.54, 11.3 (G). Note that some of these magnitudes are
revisions of those initially reported on IAUC 5244.
PERIODIC COMET SHOEMAKER-LEVY 4 (1991f)
Orbital elements from MPC 18081:
T = 1990 July 14.5431 ET Peri. = 302.2295
e = 0.422300 Node = 151.4066 1950.0
q = 2.017506 AU Incl. = 8.4785
a = 3.492310 AU n = 0.1510202 P = 6.526 years
1991 ET R.A. (1950) Decl. Delta r m1
May 4 11 28.15 +10 13.5 2.196 2.904 18.3
14 11 29.58 +10 02.5
24 11 32.87 + 9 37.6 2.517 2.990 18.8
June 3 11 37.79 + 9 01.3
13 11 44.10 + 8 15.5 2.865 3.075 19.2
23 11 51.57 + 7 22.0
1991 May 6 (5260) Daniel W. E. Green
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