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IAUC 6089: 1994g; 1994ab, 1994ac; PU Vul

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                                                  Circular No. 6089
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM

     J. V. Scotti, Lunar and Planetary Laboratory, reports his
discovery on Oct. 4 Spacewatch images of two companion nuclei to
this comet, separated from each other by 9" and from the principal
nucleus (component A) by some 23' in p.a. 245 deg.  Given that the
position of component A can be defined by T = 1994 Aug. 23.230 and
the other elements on MPC 18258, components B and C correspond to T
= 1994 Aug. 23.516 and 23.518, respectively.  The total magnitudes
of components A, B and C are 12.8, 21.3 and 20.2, respectively, and
A and C show westward tails 10' and 1' long.  Scotti confirmed the
presence of the companions on Oct. 5 Spacewatch images obtained by
R. Jedicke.

SUPERNOVAE 1994ab, 1994ac
     R. H. McNaught, Anglo-Australian Observatory, reports his discovery
of two supernovae on U.K. Schmidt exposures by C. P. Cass and
confirmed on 1.0-m reflector CCD images taken on Sept. 17 by G. J.
Garradd and himself.  SN 1994ab, discovered at mag 17 on a Sept. 13 I
plate, is at R.A. = 21h13m59s.17, Decl. = -28d32'26".3 (equinox 1950.0),
5".1 west and 16".8 south of the center of MCG -05-50-008; no image
appears at the position on the ESO B or R surveys.  SN 1994ac, discovered
at mag 18.5 on a Sept. 11 R film, is at R.A. = 23h47m19s.91, Decl.
= +2d25'29".4 (equinox 1950.0), 3" west and 6".5 south of the center of
UGC 12799 = MGC +00-60-052; no image appears at the position on U.K.
Schmidt R and I plates from 1993 Sept. 12 and Oct. 21, respectively.
Further confirmation of SN 1994ac is provided by an R film taken by
M. Hartley on 1994 Oct. 3.  A nearby star has end figures 17s.42, 58".0.

     P. M. Garnavich, Harvard-Smithsonian Center for Astrophysics; and
S. R. Trammell, University of Chicago, communicate: "The current eclipse
of the hot component in PU Vul has ended (cf. IAUC 5960, 5969).  Spectra
obtained on Oct. 3 using the McDonald Observatory's 2.7-m telescope show
that the broad emission lines of He II and C IV have returned.  Monitoring
at the Dominion Astrophysical Observatory constrains the onset of the
eclipse to between 1993 Sept. 3 and 1994 Apr. 1.  A spectrum taken on
1994 Aug. 1 showed no evidence of broad He II.  The eclipse duration is
thus between 5 and 13 months, and the orbital period of PU Vul is
13.6 +/- 0.3 years (assuming that no other eclipses have occurred
since 1980)."

1994 October 5                 (6089)              Brian G. Marsden

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