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IAUC 5500: NO Occn BY PLUTO ON 1992 MAY 21; 1992T; 1991r

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                                                  Circular No. 5500
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


NO OCCULTATION BY PLUTO ON 1992 MAY 21
     C. B. Sybert and J. L. Elliot, Massachusetts Institute of
Technology; and L. H. Wasserman, Lowell Observatory, communicate:
"Recent astrometric measurements of Pluto and P17 (Mink et al. 1991,
A.J. 101, 2255; Dunham et al. 1991, A.J. 102, 1464) with the Lick
astrograph (A. R. Klemola), the Carlsberg Automatic Meridian Circle
(L. Morrison) and the Wallace Astrophysical Observatory CCD camera
(C. B. Sybert) indicate that Pluto's shadow will pass several thousand
km north of the earth, so that an occultation by Pluto will probably
not be visible."


SUPERNOVA 1992T IN ANONYMOUS GALAXY
     M. Hamuy, Cerro Tololo Interamerican Observatory, reports further
preliminary photometry (cf. IAUC 5496; errors about 0.05 mag), obtained
by Y.-C. Kim, Yale University, with the 0.9-m CTIO telescope: Apr. 14.2
UT, V = 18.56, B-V = +0.83; 15.2, 18.60, +0.85.  It therefore appears
that SN 1992T reached maximum light around Apr. 14.  A low-dispersion
spectrum (range 620-950 nm), obtained on Apr. 14.15 by J. Baldwin with
the CTIO 4-m telescope, shows broad H-alpha emission with a P-Cyg
profile, indicating that the supernova is a type II event.  The minimum
of the absorption lies at 662.4 nm and the maximum of the emission at
673.7 nm.


COMET HELIN-ALU (1991r)
     Continuation of the ephemeris on IAUC 5433:

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Apr. 28    19 27.29    + 9 24.4    4.588    4.880  100.9   11.7     15.2
May   8    19 27.87    +11 20.4    4.478    4.889  108.3   11.3     15.1
     18    19 27.14    +13 13.5    4.381    4.899  115.3   10.8     15.1
     28    19 25.12    +15 01.2    4.299    4.911  121.9   10.1     15.1
June  7    19 21.91    +16 40.4    4.236    4.924  127.8    9.4     15.1
     17    19 17.71    +18 08.2    4.194    4.937  132.5    8.7     15.0
     27    19 12.77    +19 21.9    4.173    4.953  135.7    8.2     15.1
July  7    19 07.43    +20 19.8    4.176    4.969  137.1    8.0     15.1
     17    19 02.06    +21 00.8    4.201    4.986  136.4    8.1     15.1
     27    18 57.03    +21 25.4    4.247    5.005  133.9    8.4     15.1
Aug.  6    18 52.70    +21 34.7    4.314    5.024  129.8    8.9     15.2


1992 April 20                  (5500)              Brian G. Marsden

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