Circular No. 2717 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Cable Address: SATELLITES, NEWYORK Western Union: RAPID SATELLITE CAMBMASS PERIODIC COMETS SWIFT (1895 II) AND SCHORR (1918 III) Dr. N. A. Belyaev, Institute for Theoretical Astronomy, Leningrad, provides the following predicted elements, calculated by O. I. Stal'bovskij and himself for P/Swift (formerly P/Swift 2) and by V. V. Emel'yanenko, N. Yu. Goryajnova and himself for P/Schorr: P/Swift P/Schorr Epoch = 1974 Nov. 9.0 1975 Jan. 28.0 ET T = 1974 Nov. 5.3155 1974 Dec. 18.3510 ET Peri. = 187.2789 319.5034 Node = 145.8258 82.8135 1950.0 Incl. = 8.7538 6.4561 q = 1.327921 2.536241 AU e = 0.642374 0.359375 a = 3.713156 3.959010 AU n = 0.1377493 0.1251193 P = 7.155 7.877 years The predicted values of T are uncertain by at least + 10 days. An ephemeris for P/Swift appears in Handb. Br. Astron. Assoc. for 1974; P/Schorr is not like1y to be brighter than magnitude 20. 1932 HA (APOLLO) The following ephemeris, by B. G. Marsden, is from an orbit derived from observations 1973 Mar. 28 to 1974 Mar. 13: 1974/75 ET R. A. (1950) Decl. Delta r Mag. Dec. 19 13 44.59 - 7 18.1 2.096 1.808 20.5 29 14 05.54 - 9 20.7 Jan. 8 14 27.85 -11 24.3 1.774 1.682 20.1 18 14 51.92 -13 29.0 28 15 18.38 -15 34.8 1.450 1.540 19.6 Feb. 7 15 48.13 -17 41.0 17 16 22.41 -19 45.2 1.146 1.380 19.0 27 17 02.97 -21 40.7 Mar. 9 17 51.97 -23 12.3 0.890 1.204 18.4 19 18 51.19 -23 50.2 29 20 00.23 -22 50.4 0.735 1.015 17.9 Apr. 8 21 14.46 -19 38.7 18 22 26.38 -14 28.6 0.745 0.828 17.8 28 23 30.95 - 8 16.0 May 8 0 27.81 - 1 53.3 0.928 0.683 17.8 18 1 19.15 + 4 10.9 28 2 07.09 + 9 41.1 1.206 0.655 17.8 Mag. = 17.0 + 5 log Delta + 5 log r + 0.023 (phase angle) PERIODIC COMET SCHWASSMANN-WACHMANN 1 The following precise positions have been reported: 1974 UT R. A. (1950) Decl. m1 Observer Oct. 5.44097 23 07 19.29 + 1 17 49.4 13 Seki 8.45909 23 06 11.48 + 1 11 22.9 14 " 11.78917 23 05 01.24 + 1 04 39.0 Mrkos 13.59757 23 04 26.13 + 1 00 58.2 15 Seki 14.60851 23 04 06.71 + 0 59 03.6 14.5 Furuta 17.76977 23 03 09.87 + 0 53 09.4 Mrkos T. Seki (Kochi Observatory, Geisei Station). From Orient. Astron. Assoc. Comet Bull. No. 93. A. Mrkos (Klet Observatory). T. Furuta (Tokai). From Orient. Astron. Assoc. Comet Bull. No. 93. R CORONAE BOREALIS E. F. Tedesco and D. W. Dawson, Department of Astronomy, New Mexico State University, provide the following photoelectric observations, obtained with the 41-cm Tortugas reflector (and 1P21 photomultiplier) and 61-cm Blue Mesa reflector (EMI 9502): 1974 UT V B - V U - B Wt. Location June 19.208 6.78 +/- 0.02 +0.77 +/- 0.02 +0.32 +/- 0.03 1 Blue Mesa 20.253 6.71 +/- 0.03 +0.76 +/- 0.03 +0.34 +/- 0.03 1 " 21.255 6.69 +/- 0.02 +0.76 +/- 0.02 +0.34 +/- 0.03 1 " July 17.175 6.28 +/- 0.05 2.5 Tortugas 22.3 6.20 +/- 0.03 +0.78 +/- 0.02 1 " Oct. 2.139 6.03 +/- 0.02 +0.65 +/- 0.02 +0.23 +/- 0.08 1.5 Blue Mesa 3.079 6.03 +/- 0.01 +0.61 +/- 0.02 +0.16 +/- 0.02 1 " 5.084 5.98 +/- 0.03 +0.64 +/- 0.02 +0.22 +/- 0.02 1 " They also determined photoelectric magnitudes for four comparison stars (shown as '72', '76', '79' and '83', respectively, on the AAVSO chart), namely: SAO 084005, V = 7.44 +/- 0.02, B - V = +0.47 +/- 0.03, U - B = -0.01 +/- 0.03 (five nights); SAO 084053, V = 7.81 +/- 0.05, B - V = +1.20 +/- 0.02 (four nights); SAO 083985, V = 8.05 +/- 0.03, B - V = +0.60 +/- 0.02 (one night); and SAO 084057, V = 8.32 +/- 0.03, B - V = +1.08 +/- 0.02 (one night). 1974 November 14 (2717) Brian G. Marsden
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