Circular No. 3441 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758 1947 XC = 1979 XA Further precise positions have been reported as follows: 1979/80 UT R. A. (1950) Decl. Observer Dec. 18.00733 2 10 22.45 +12 46 06.0 McCrosky 20.16458 1 57 49.65 +11 58 13.2 Bowell Jan. 5.12292 0 10 01.92 + 4 01 07.1 Giclas R. E. McCrosky (Harvard Observatory). Correction to IAUC 3436. E. Bowell and H. L. Giclas (Lowell Observatory, Anderson Mesa Station). 0.3-m photographic telescope. Measurer: M. L. Kantz. It can now be confirmed that the object made ten revolutions between 1947 and 1979 (cf. IAUC 3432). The following orbital elements, by the undersigned, are from an accurate linkage of the two apparitions, full perturbations being taken into account. T = 1980 Feb. 17.4804 ET Epoch = 1980 Feb. 11.0 ET Peri. = 95.6982 e = 0.712126 Node = 76.4652 1950.0 a = 2.174565 AU Incl. = 2.5160 n = 0.3073587 q = 0.626001 AU P = 3.207 years 1980 ET R. A. (1950) Decl. Delta r B Jan. 7 23 55.53 + 2 50.3 12 23 14.90 - 0 33.4 0.215 0.892 15.6 17 22 32.09 - 4 11.0 22 21 49.13 - 7 46.2 0.232 0.784 16.4 ECLIPSE OF SATURN VI (TITAN) Z. Kopal, University of Manchester, communicates the following note by E. Budding and A. S. Asaad: "The disappearance phase of the Titan eclipse on 1979 Dec. 20.1 UT was observed using the 1.9-m reflector at the Kottamia station of the Helwan Observatory. The sky conditions were relatively good, although clouds had dispersed only shortly before the eclipse. This was observed to start at 2h12m25s UT, and Titan had dropped in brightness by 7.1 mag by 2h38m05s (times to the nearest 5s), when it was only 3 percent above the background scattered light from Saturn. The effective wavelength of observation was 660 nm with 40-nm-halfwidth filter." 1980 January 11 (3441) Brian G. Marsden
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