Central Bureau for Astronomical Telegrams
IAUC 5502: HV Vir; N Cyg 1992; 1992H; EY Cyg
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Read IAUC 5503
Circular No. 5502
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. Schmeer, Bischmisheim, Germany, reports what appears to be
an outburst of HV Vir = NSV 6201 = Nova Vir 1929 (R.A. = 13 18.5,
Decl. = +2 09, equinox 1950.0). His visual magnitude estimates
follow: Apr. 19.917 UT, [13.2; 20.928, 12.0; 20.965, 11.9; 21.053,
11.7. In response to a request relayed by G. M. Hurst, "The
Astronomer", P. M. Kilmartin, Mount John Observatory, reports that
A. C. Gilmore has confirmed the presence of a star of V = 11.5 and
novalike colors (i.e., an ultraviolet excess) at the indicated
position (evidently around Apr. 21.4 UT). HV Vir was briefly
observed at mag 11 in Feb. 1929 (Schneller 1931, A.N. 243, 335),
and Duerbeck (1987, Space Sci. Rev. 45, 155) has identified the
object on the Palomar Sky Survey as a star of mag 19.
NOVA CYGNI 1992
R. M. Hjellming, National Radio Astronomy Observatory, reports
the detection of Nova Cygni 1992 with the VLA on Mar. 30 with flux
densities of 0.4, 1.0 and 1.8 mJy at 8.4, 14.9 and 22.5 GHz. The
radio position, R.A. = 20h30m31s.7 +/- 0s.2, Decl. = +52d37'51" +/-
3" (equinox 2000.0), is consistent with the optical position on IAUC
5454. The radio spectrum on Mar. 30, previous VLA non-detections on
Mar. 6 and 12, and the flux density of 69 mJy at 1.3 mm on Mar. 14
(IAUC 5476), all indicate that the nova is in an early radio state
with a rising lightcurve and an optically-thick thermal spectrum.
SUPERNOVA 1992H IN NGC 5377
Visual magnitude estimates: Feb. 22.98 UT, 14.6 (M. Villi and G.
Cortini, Mount Colombo, Italy); 23.94, 14.2 (S. Pesci, Milan, Italy);
28.29, 15.2 (W. Wren, McDonald Observatory); 29.98, 14.5 (Pesci); Mar.
30.25, 15.5 (Wren); Apr. 9.26, 15.5: (Wren); 19.24, 15.7 (Wren).
EY CYGNI
Further visual magnitude estimates (cf. IAUC 5484): Apr. 2.14 UT,
11.7 (Schmeer); 6.08, 12.1 (Schmeer); 7.03, 12.1 (Schmeer); 8.06, 12.2
(Schmeer); 9.09, 12.4 (Schmeer); 10.10, 12.1 (M. Verdenet, Bourbon-
Lancy, France).
1992 April 21 (5502) Brian G. Marsden
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