Circular No. 3519 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 H 2252-035 G. Williams and M. Johns, University of Michigan and McGraw-Hill Observatory, report: "Spectrophotometric observations reveal a velocity curve, determined from the H-alpha emission feature, with a semiamplitude of 151 +/- 10 km/s and a displacement of -18 +/- 10 km/s. Combination of these observations with those of Patterson and Price (preprint; see also IAUC 3511) gave a more accurately determined period of 0.14959 +/- 0.00003 day. Linear-polarization measurements made on Sept. 1 and 2 were folded with the 805-s x-ray, 858.7-s optical and above 0.14959-day orbital periods. No significant modulation was found at any of these periods to a limit of 0.2 percent in the polarization." COMET RUSSELL (1980l) Continuation to the ephemeris on IAUC 3513: 1980 ET R. A. (1950) Decl. Delta r m1 Sept.28 2 39.88 -48 49.7 Oct. 8 2 10.30 -54 47.0 2.220 2.823 16.7 18 1 30.24 -59 28.9 28 0 42.46 -62 24.5 2.321 2.720 16.7 Nov. 7 23 54.03 -63 29.7 17 23 12.49 -63 08.6 2.537 2.629 16.7 27 22 41.18 -61 56.4 Dec. 7 22 19.54 -60 22.4 2.782 2.552 16.8 17 22 05.53 -58 44.7 27 21 57.04 -57 13.6 2.988 2.492 16.8 29999-221-3528 If the middle digit of the middle group of figures on your address label is a 2, then the last four figures show the IAUC No. up to which you have paid. If this number is 3528 or less, fewer than ten issues remain in your subscription, and renewal is now desirable to ensure continuity of service. The special renewal rate is normally $12.00 for 50 issues or $24.00 for 100. The regular rate, for billed subscribers, is $40.00 for 100 issues, and the last four figures on the address label show the month of billing. Special subscribers are advised that missing issues can be supplied only at the regular rate of 40c per Circular. 1980 September 26 (3519) Brian G. Marsden
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