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IAUC 4029: 1982i

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                                                  Circular No. 4029
Central Bureau for Astronomical Telegrams
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

     Low-resolution spectra (~ 1.5 nm) of P/Halley were obtained by 2
groups in Arizona using the Kitt Peak 4-m telescope with the cryogenic
camera (spectral range = 460-800 nm; observers M. Belton, H.
Spinrad, P. Wehinger, S. Wyckoff) and the Mount Hopkins 4.5-m MMT
with an intensified reticon (range 300-750 nm; observers Wyckoff,
Wehinger, Belton, M. Wagner, D. Schleicher).  The Kitt Peak group
observed on 1984 Feb. 4 UT (V = 23.5, exposure time 3600 s), Oct.
30 (V = 21.3, 5800 s), and Nov. 26 (V = 20.5, 3600 s), while the
MMT group observed on 1984 Nov. 26 (V = 20.5, 4000 s).  The data
show no detected molecular or atomic emission features, but only a
reflected solar continuum.  The Nov. 26 Kitt Peak spectra probably
indicate an albedo increase by ~ 30 percent over the range 460-800
nm relative to earlier spectra.  The Oct. 30 data (obtained with a
long slit) show a resolved/extended coma ~ 16" in diameter (5.5 x
10**4 km) in the sunward direction.


     Belton, Spinrad, Wehinger, and Wyckoff also report that
observations made on 1984 Dec. 27 UT, with the Kitt Peak 4-m reflector
and cryogenic camera (TI 800x800-pixel CCD; spectral resolution 1.5
nm), show continuous spectra for both 1983 TB and comet 1984s,
except the latter did show weak [O I] 630-nm emission which extended
4"-5" into the coma.  The long-slit spectra (4') of the comet also
show broad wings (50") in the continuum which are significantly
redder than the central part of the coma.  The color of 1983 TB is
like an S-type asteroid.

     Visual magnitude estimates for 1983 TB: 1984 Dec. 23.14 UT,
13.5: (C. Morris, Whitaker Peak, CA); 24.23, 13.5 (A. Hale, Pine
Valley, CA).

     Total visual magnitude estimates of comet 1984s: Dec. 19.88,
10.0 (P. Valisa, Varese, Italy, 0.20-m reflector; photographic tail
10' to west); 23.19, 10.7 (C. S. Morris, 0.25-m reflector, Whitaker
Peak, CA); 1985 Jan. 16.24, 10.3 (Morris, 3' tail in p.a. 40 ).


     Total visual magnitude estimates by C. Morris, 0.25-m
reflector, near Mt. Wilson, CA: Jan. 18.56 UT, 13.0; 20.55, 13.0.

1985 January 28                (4029)            Daniel W. E. Green

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