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IAUC 5503: HV Vir; N Sgr 1992; N Pup 1991

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                                                  Circular No. 5503
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)


HV VIRGINIS
     P. M. Kilmartin, Mount John University Observatory, communicates
the following precise position, measured from an exposure by A. C.
Gilmore with a 0.15-m astrograph on Apr. 21.4 UT: R.A. = 13 18 30.22,
Decl. = +2 09 10.1 (equinox 1950.0).  This is in very close agreement
with Duerbeck's (1987, Space Sci. Rev. 45, 155) position for the mag
19 star on the Palomar Sky Survey (end figures 30.17, 11.5).
Photoelectric photometry gave the following results: Apr. 21.427 UT, V
= 11.56, B-V = -0.12, U-B = -1.01; 21.456, 11.64, -0.13, -1.01.

     M. Della Valle, European Southern Observatory; H. W. Duerbeck,
Astronomical Institute, Munster University; and C. Motch, Max-Planck-
Institut fur Extraterrestrische Physik, report: "A low-dispersion CCD
spectrum (range 760-720 nm, resolution about 0.6 nm) was obtained on
Apr. 22.25 UT with the ESO/MPI 2.2-m telescope (+ EFOSC) at La Silla.
The spectrum has a strong blue continuum, with H beta, H alpha and He
I 587.6 nm showing broad absorption troughs (mean total width 5000 +/-
800 km/s), the last two lines with central emissions reaching the
strength of the continuum.  He II 468.6 nm appears as a weak narrow
emission.  The spectral appearance suggests that the object is a dwarf
nova in outburst, not a recurrent nova.  Its amplitude of about 8 mag
indicates that it belongs to the class of WZ Sge-type dwarf novae with
long cycles.  Search for previous outbursts is encouraged."

     The following photometry was obtained by E. Poretti (Brera
Observatory, Milan) on Apr. 22.3 UT with the ESO 0.5-m telescope: V =
11.9 +/- 0.05, B = 11.8 +/- 0.2, U = 10.8 +/- 0.2.


NOVA SAGITTARII 1992
     Visual magnitude estimates by R. Royer, Lakewood, CA:
Feb. 25.54 UT, 11.0:; 27.54, 10.8; Mar. 18.54, 11.9; 24.51, 12.6:.


NOVA PUPPIS 1991
     Further visual magnitude estimates: Mar. 4.07 UT, 10.3 (M. Adams,
Melbourne, FL); 7.27, 10.2 (Royer); 8.92, 10.3 (A. Pereira, Cabo da
Roca, Portugal); 12.18, 10.5 (Royer); 16.12, 10.6 (Adams); 19.19, 10.5
(Royer); 22.25, 10.5 (Royer); 24.06, 10.7 (Adams); Apr. 5.47, 10.5 (P.
F. Williams, Heathcote, N.S.W.); 10.51, 10.5 (Williams).


1992 April 22                  (5503)              Brian G. Marsden

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