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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