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IAUC 5497: N Cyg 1992; 1992g

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                                                  Circular No. 5497
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

     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).

     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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