Central Bureau for Astronomical Telegrams
IAUC 5497: N Cyg 1992; 1992g
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Circular No. 5497
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)
NOVA CYGNI 1992
R. D. Gehrz, Department of Astronomy, University of Minnesota,
reports near-simultaneous infrared measurements on Apr. 12.5 UT by T.
J. Jones, G. Lawrence and himself, using a multifilter bolometer on
the 0.75-m telescope at the O'Brien Observatory, and by T. Hayward, J.
Hauck and J. Miles, of Cornell University, using a 7-13-micron array
spectrometer (lambda/dlambda = 2000) on the Hale 5-m telescope at the
Palomar Observatory. The O'Brien photometry gives J = 6.0, H = 6.3, K
= 5.8, L = 4.7, N = 2.9. The slope of the continuum beyond H is
constant, showing that the nova is still in an optically thin, free-
free expansion phase. The high-resolution data show the presence of
emission from Humphreys alpha at 12.37 microns and of [Ne II] at 12.8
microns. Additional measurements by the Cornell group on Apr. 13.5
show that the hydrogen line is a factor of four and the neon line a
factor of 13.5 above the continuum. The full width of the infrared
lines appears to be about 3000 km/s.
Further visual magnitude estimates: Apr. 10.09 UT, 7.6 (M.
Verdenet, Bourbon-Lancy, France); 12.02, 7.6 (P. Rapavy, Rimavska
Sobota, Czechoslovakia).
PERIODIC COMET MUELLER 4 (1992g)
Further precise positions have been reported as follows:
1992 UT R.A. (2000) Decl. m1 Observer
Apr. 12.66736 14 11 26.19 +28 23 04.6 17 McNaught
14.77882 14 10 19.52 +28 41 24.5 17 Seki
14.79063 14 10 19.15 +28 41 28.6 "
R. H. McNaught (Siding Spring). Uppsala Southern Schmidt. Object
slightly diffuse; definitely cometary.
T. Seki (Geisei). 0.6-m reflector. Communicated by S. Nakano.
Computations from the available observations, Apr. 9-14, show
that the comet is of short period:
T = 1992 Jan. 27.560 TT Peri. = 37.481
e = 0.40498 Node = 146.151 2000.0
q = 2.62296 AU Incl. = 30.082
a = 4.40815 AU n = 0.106492 P = 9.26 years
1992 April 15 (5497) Brian G. Marsden
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