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IAUC 2706: Occn OF BD +13 1940 BY 129 ANTIGONE ON 1974 Oct. 12; P/SCHWASSMANN-WACHMANN 1

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IAUC number 

                                                  Circular No. 2706
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


OCCULTATION OF BD +13 1940 BY 129 ANTIGONE ON 1974 OCTOBER 12
     Mr. G. E. Taylor writes that calculations based on detailed
ephemerides provided by the Institute for Theoretical Astronony,
Leningrad, indicate that the star BD +13 1940 (= HR 3376 = ZC 1281
= SAO 097913; mv = 6.4, spectrum K0; R.A. = 8h31m.0, Decl. = +13o26',
equinox 1950.0) will be occulted by the minor planet 129 Antlgone (mv ~
12) on Oct. 12.  The occultation is unlikely to last for more than
0m.1 and will occur around 8h01m UT in a band running (nominally)
from Hidalgo del Parral, Chihuahua; near Houston, Texas; New Orleans,
Louisiana; and Jacksonville, Florida; to Hamilton, Bermuda.
The track will probably be no more than 100 to 150 km in width, and
its position is uncertain by perhaps ten times this amount.  Positive
(with the duration of occultation measured to 0s.1, if possible)
and negative observations should be forwarded to Mr. Taylor at
the address: H.M. Nautical Almanac Office, Royal Greenwich Observatory,
Herstmonceux Castle, Hailsham, Sussex BN27 1RP, England.


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     Corrigendum.  The observations mentioned on IAUC 2705 were
made, not by "M. Koishikawa and others at Sendai", but by K.
Tsuchiya (Asahikawa).  According to Nihondaira Obs. Circ. No. 560,
revised estimates give m1 ~ 10.5 to 11 and a coma diameter of 3' on
Sept. 21.53 and 23.71 UT (11.1-cm f/4.5 camera and 20-cm reflector).

     Observations by A. Mrkos and Ruzena Petrovicova, Klet Observatory,
showed the comet at magnitude about 18 on Aug. 12, 15 and 16.
On Sept. 11 it was of magnitude 12, with a bright condensation and
a coma of about 2'.  On Sept. 12.7 UT Mrkos and O. Dobrovol'skij
(visiting from Dushanbe) estimated m1 = 12.7 (visually, 25-cm
refractor).  On Sept. 16 and 17 the coma was more diffuse and fainter.
Positional measures follow:

     1974 UT             R. A. (1950) Decl.        m1    Observer
     Sept.11.87529    23 17 44.73   + 2 09 42.7   12     Petrovicova
          11.89369    23 17 44.19   + 2 09 42.5            "
          12.86000    23 17 16.94   + 2 07 41.3   12.7   Mrkos
          12.87632    23 17 16.48   + 2 07 40.9            "
          16.86616    23 15 23.70   + 1 59 07.3   13.2     "
          17.87413    23 14 55.51   + 1 56 55.6   13.5   Petrovicova
          17.89323    23 14 54.96   + 1 56 49.4            "


1974 October 8                 (2706)              Brian G. Marsden

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