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IAUC 3479: LUNAR Occns OF X-RAY SOURCES; 1979 YA

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IAUC number 

                                                  Circular No. 3479
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


LUNAR OCCULTATIONS OF X-RAY SOURCES
     L. V. Morrison writes: "The table below (superseding that on
IAUC 3049) gives the first and last dates on which lunar occultations
of x-ray sources may be observed in the next few years.  Occultations
will occur at monthly intervals between these dates.
Further details may be obtained by writing to me at the address:
H.M. Nautical Almanac Office, Royal Greenwich Observatory, Herstmonceux
Castle, Hausham, East Sussex BN27 1RP, England."

            Source                First         Last       Note
    3U 1617-15 = Sco X-1       before  1980  1981 Feb. 26    1
     A 1805-18                 before  1980  1980 Oct. 15
    2A 2302-088                1980 Jan. 21  1981 Oct. 10
     H 1648-185                1980 Apr.  5  1982 July  3
    MX 1746-20 = NGC 6440      1980 May  31  1982 Mar. 17
    3U 1758-20 = GX9+l         1980 May  31  1982 Feb. 18
    4U 1253-00                 1980 June 21  1984 Aug.  2
    2A 1306-012                1980 June 21  1984 June  8
    3U 1224+02 = 3C 273        1980 July 18  1985 May  29
     A 1020+13                 1980 Nov.  1  1982 Apr.  4
    4U 0617+23 = IC 443        1981 Oct. 18  1983 Feb. 23
    3U 0531+21 = Crab Nebula   1981 Nov. 14  1983 July  8
     H 0751+222 = U Gem        1981 Nov. 16  1983 Mar. 23
    3U 0012-05                 1982 Jan.  2  1984 Jan.  9
    4U 1730-22                 1982 Mar. 17  1983 June 24
    3U 1832-23 = GXlO-6        1982 Mar. 18  1983 May   2
    3U 0255+13 = Abell 401     1982 Mar. 28  1984 Feb.  9
    4U 1853-23                 1982 June  8  1983 Oct. 13
    MX 1803-24                 1983 Mar.  7  1984 Aug.  7
    3U 1709-23 = GXO-9         1983 Apr. 30  1984 Sept. 3
    3U 1758-25 = GX5-1         1983 Aug. 18  1985 Jan. 18
    3U 1728-24   GX1+4         1983 Oct. 11  1985 Feb. 14

Note 1: only observable south of the equator.


1979 YA
     The object given this designation on IAUC 3434 and 3437 seems
not to be real.  The observations (on 1979 Dec. 16 and 20) should
be deleted, and the designation is hereby canceled.


1980 May 27                    (3479)              Brian G. Marsden

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