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IAUC 4449: 1987w; N Cyg 1986

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                                                  Circular No. 4449
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


PERIODIC COMET HELIN (1987w)
     A. Maury, Palomar Observatory, reports his identification of
faint images of comet 1987w on exposures by J. Mueller and J.
Phinney with the 1.2-m Schmidt:

         1987 UT               R.A. (1950) Decl.
         Sept.17.36458       1 22 04.2       + 2 50 46
              17.44097       1 22 03.4       + 2 50 31
              18.38889       1 21 48.2       + 2 46 25
              18.41667       1 21 47.8       + 2 46 20

     Orbital elements from the eight available observations:

          T = 1987 Aug. 16.487 ET
          W = 217.519                    e =   0.56050
          O = 143.122   1950.0           a =   5.86490 AU
          i =   4.698                    n =   0.069393
          q =   2.57760 AU               P =  14.2 years

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Sept. 2     1 23.56    + 3 44.4    1.745    2.581    16.3
          12     1 23.16    + 3 12.3
          22     1 20.71    + 2 30.6    1.637    2.594    16.2
     Oct.  2     1 16.69    + 1 44.0
          12     1 11.84    + 0 58.4    1.622    2.617    16.2
          22     1 06.96    + 0 19.8
     Nov.  1     1 02.91    - 0 06.7    1.711    2.649    16.4


NOVA CYGNI 1986
     M. A. Greenhouse, C. Woodward and R. Seaman, Wyoming Infrared
Observatory (WIRO); and G. Poczulp, National Optical Astronomy
Observatory, write: "We obtained K-band circular-variable-filter
(CVF) observations at WIRO of Nova Cyg 1986 on 1987 Aug. 29 that
revealed lines at 1.96, 2.04, 2.32 and 2.47 (+/- 0.02) microns.  These
features are similar to those observed in Nova Vul 1984 No. 2 and
V1500 Cyg (Greenhouse et al. 1987, A.J. in press; Grasdalen and
Joyce 1976, Nature 259, 187).  The line-to-continuum ratios for
the above lines were 6, 2, 2 and 8, respectively, at the 2.2-
percent resolution of the CVF.  The line intensities in units of
10**-13 erg s-1 cm-2 were 22.8 +/- 0.68, 5.89 +/- 0.33, 5.74 +/- 0.29 and
23.0 +/- 0.81, respectively."


1987 September 19              (4449)              Brian G. Marsden

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