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iau5407.txt
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1995-05-02
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Circular No. 5407
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
PERIODIC COMET KOWAL 2 (1991f1)
Ephemeris from the orbital elements on IAUC 5406:
1991 ET R.A. (1950) Decl. Delta r m1
Dec. 10 8 31.62 + 0 39.2 0.756 1.546 14.3
15 8 32.92 - 1 27.5
20 8 33.07 - 3 26.2 0.739 1.574 14.3
25 8 32.13 - 5 14.8
30 8 30.20 - 6 51.4 0.736 1.608 14.4
LB 1800
R. Baptista, Instituto Astronomico e Geofisico, Sao Paulo; and
D. Cieslinski, Instituto Nacional de Pesquisas Espaciais/SECT, San
Jose dos Campos, communicate: "We have discovered that the ephemer-
is of Buckley et al. (1990, Ap.J. 355, 617) for the timings of mini-
mum light in the eclipsing cataclysmic variable LB 1800 has accumu-
lated an error which now amounts to +0.26 cycles. We used the
FOTRAP photometer at the 0.6-m telescope at CNPq/Laboratorio Naci-
onal de Astrofisica, Brazil, to obtain high speed (10-s) UBVRI pho-
tometry of this object. The data comprise three observed eclipses,
on 1991 Jan. 13, Dec. 4, and Dec. 5. We determined the times of
minimum by adjusting a parabola and a cubic function to the points
during eclipse and calculating their minimum, and by employing bi-
sected chords to find the average of the mean point from a group of
chords at different depth levels. We list below the measured tim-
ings, the corresponding cycle, and O--C values with respect to the
new ephemeris (the uncertainties quoted in parentheses are the er-
rors of the mean of the determinations from the methods employed):
HJD 2448269.63136(15), 6177, +0.0024; HJD 2448595.73325(11), 7583,
+0.0015; HJD 2448596.66022(09), 7587, -0.0018. Together with the
original 9 timings of Buckley et al., this gives the new ephemeris
Tmin = HJD 2446836.96176(25) + 0.231936060(35)E, with a correspond-
ing dispersion of 0.00636 cycles for the 12 timings used."
PERIODIC COMET FAYE (1991n)
Total visual magnitude estimates (cf. IAUC 5382) by A. Hale,
Las Cruces, NM (B = 10x50 binoculars; L = 0.41-m reflector): Nov.
27.21 UT, 9.7 (B); Dec. 4.27, 9.9 (L); 13.29, 10.3 (L).
1991 December 17 Daniel W. E. Green