Central Bureau for Astronomical Telegrams
IAUC 5250: N LMC 1991; N Cen 1991; 1991 FB
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Circular No. 5250
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
A. C. Gilmore reports the following photometry obtained with
the 0.6-m Cassegrain reflector at Mt. John University Observatory on
Apr. 21.39 UT: V = 10.23 +/- 0.01, U-B = -0.8 +/- 0.2, B-V = 0.00
+/- 0.01, V-R = +0.11 +/- 0.01, V-I = +0.18 +/- 0.03.
W. Liller, Vina del Mar, Chile, notes that this nova is now the
brightest one seen in the LMC; its peak absolute magnitude is
expected to equal approximately that of V1500 Cyg. Visual magnitude
estimates (those by Liller are photovisual): Apr. 19.001 UT, 12.5
(Liller); 19.98, 11.8 (Liller); 21.04, 10.4 (Liller); 21.99, 9.8
(Liller); 23.76, 8.8 (T. Cooper, Benoni, R.S.A.); 24.73, 9.2 (Cooper);
24.77, 9.0 (D. Overbeek, Edenvale, R.S.A.).
NOVA CENTAURI 1991
Gilmore reports the following photometry (obtained as above,
though affected by clouds) on Apr. 21.63 UT: V = 10.97 +/- 0.07,
U-B = +0.33 +/- 0.05, B-V = +1.58 +/- 0.02, V-R = +1.30 +/- 0.01,
V-I = +2.42 +/- 0.02.
Photovisual magnitudes by Liller (Tech Pan film, minus UV
filter): Apr. 15.116 UT, 11.2; 17.010, 11.2; 18.030, 11.2; 19.032,
11.1; 20.00, 11.1; 21.10, 11.2; 22.03, 11.3. Visual magnitude
estimates (cf. IAUC 5241): Apr. 17.56 UT, 11.5 (P. F. Williams,
Heathcote, N.S.W.); 24.75, 10.6 (T. Cooper, Benoni, R.S.A.); 24.75, 10.6
(D. Overbeek, Edenvale, R.S.A.).
1991 FB
Ephemeris from orbital elements on MPC 18130:
1991 ET R.A. (1950) Decl. Delta r V
Apr. 24 19 06.88 -49 21.9 0.132 1.055 16.8
29 20 19.44 -50 44.4
May 4 21 16.16 -49 51.4 0.165 1.039 17.6
9 21 57.29 -48 04.9
14 22 26.83 -46 08.3 0.207 1.038 18.1
19 22 48.40 -44 18.5
24 23 04.47 -42 40.9 0.250 1.053 18.5
29 23 16.61 -41 16.5
June 3 23 25.76 -40 05.2 0.289 1.082 18.7
8 23 32.45 -39 06.5
13 23 36.99 -38 19.8 0.324 1.124 18.8
18 23 39.52 -37 43.7
23 23 40.15 -37 17.0 0.354 1.175 18.9
1991 April 24 (5250) Daniel W. E. Green
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