Circular No. 4251 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 617-495-7244/7440/7444 LR SAGITTARII M. Verdenet, Bourbon-Lancy, France, reported the discovery of a possible nova on Aug. 28.9 UT of mag 11.0 and located 1'5 north of V1017 Sgr. The object was evidently identical with the possible nova reported by V. L. Matchett on 1973 Oct. 24 (IAUC 2588). Identification of Matchett's object with LR Sgr was immediately proposed, although the remarks on IAUC 2604 erroneously suggested that this was invalid. Vidal (1974, P.A.S.P. 86, 308), Hoffleit (IBVS 912) and recent observations by E. Belserene, Maria Mitchell Observatory (mpg = 13.5 on Aug. 25.04, mpg = 13.2 on Sept. 1.08), make the identity with this 275-day-period Mira star quite clear. DRACONID METEORS I. Ferrin, Universidad de Los Andes, Merida, writes that, since the earth will be crossing the line joining the corresponding points in 1933 and 1946, there exists a possibility for a strong shower from a radiant near R.A. = 17h23m, Decl. = +57 deg (equinox 1950.0) some time during 1986 Oct. 8.8-9.4 UT, even though the associated periodic comet Giacobini-Zinner was in the vicinity a year ago. NOTICE TO SUBSCRIBERS Many subscribers seem to be unaware that these Circulars are available through our Computer Service. The Computer Service allows the Circulars to be read in their entirety as soon as they are issued, which may be several days (weeks?) before they are received by mail. Although Computer Service callers must generally use commercial telephone lines, and there are unfortunate international differences in modem protocol, multi-protocol modems are now available in many countries. The Computer Service provides a very convenient mechanism for the submission of observations to the Central Bureau, both as a direct message and using the self- checking XMODEM or KERMIT file-transfer procedures. In association with the Minor Planet Center, users have the capability of taking orbital elements of comets and minor planets from our files, of calculating ephemerides from them, and also of producing lists of the known comets and numbered minor planets in a particular region of the sky at a specified time--a feature that is especially useful to potential discoverers of novae and supernovae. The service is available to all subscribers to the printed Circulars for a further monthly charge of $7.50 (regular) or $4.50 (special). 1986 September 5 (4251) Brian G. Marsden
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