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IAUC 5627: 1992x; 1992ay; 1992t

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                                                  Circular No. 5627
Central Bureau for Astronomical Telegrams
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

     S. Nakano, Sumoto, Japan, reports that this comet has been
recovered by T. Seki, Geisei, using a 0.60-m f/3.5 reflector.  The
comet was nearly stellar with slight diffuseness on Oct. 1.  The
prediction on MPC 16379 (ephemeris on MPC 20353) requires correction
by Delta(T) = -0.14 day.  The prediction with nongravitational
terms by Muraoka on Nakano Note No. 557 (ephemeris on page 60 of
Comet Handbook 1992, Oriental Astronomical Assn.) requires
correction by Delta(T) = -0.02 day.

     1992 UT             R.A. (2000) Decl.        m1
     Sept.25.72674    4 25 43.71   +11 08 15.8   20
     Oct.  1.77188    4 30 07.34   +11 12 50.8   19.2

     M. M. Phillips, Cerro Tololo Interamerican Observatory, reports
that a spectrogram of SN 1992ay (cf. IAUC 5619) obtained with
the CTIO 4.0-m telescope on Oct. 1.34 UT shows that this object is
a peculiar type-II event.  Strong and relatively narrow (about 1200
km/s FWHM) H I emission lines are observed, along with weaker emission
apparently due to He I (587.6 and 447.1 nm).  The H I emission
line profiles appear to be composed of a broad base and a separate,
narrower core.  These emission features lie atop a strong blue
continuum. The cores of the H-alpha and H-beta lines yield a redshift
of 0.062.

     J. DeYoung and R. Schmidt, U.S. Naval Observatory, report that
P/Swift-Tuttle was observed on Sept. 30.0 UT with the 0.6-m reflector
(+ CCD + H-alpha filter) in Washington.  A co-addition of seven
90-s images shows a prominent fan-shaped inner coma with jets or
extensions of length 22" at p.a. 220 deg and length 19" at p.a. 262
     Total visual magnitude estimates (cf. IAUC 5621):  Sept. 29.01
UT, 9.1 (A. Renou, Blaison, France, 0.12-m reflector); 29.50, 8.9
(C. S. Morris, near Mount Wilson, CA, 20x80 binoculars); 30.77, 9.0
(S. Baroni, Milan, Italy, 20x80 binoculars); Oct. 1.22, 8.9 (M.
Tombelli, Montelupo, Italy, 0.44-m reflector).

1992 October 2                 (5627)            Daniel W. E. Green

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