Central Bureau for Astronomical Telegrams
IAUC 4086: 1985g; CPD -58 2721
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Read IAUC 4087
Circular No. 4086
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 GICLAS (1985g)
This comet has been recovered by E. Everhart on an exposure
by J. Briggs and by C.-Y. Shao on exposures by G. Schwartz:
1985 UT R.A. (1950.0) Decl. m1 Observer
June 22.38646 0 53 11.05 - 0 36 55.6 20 Everhart
July 18.30242 1 43 07.71 + 2 36 51.6 18 Shao
21.30067 1 48 45.37 + 2 55 06.1 18 "
E. Everhart (Chamberlin Observatory field station, near Denver).
0.4-m reflector. Weak image, unconfirmed at the time.
C.-Y. Shao (Oak Ridge Observatory). 1.5-m reflector. Plates very
dark; inkdot measured on July 18. The comet's image is strongly
condensed, possibly even stellar in appearance.
The above positions show that the prediction by S. Nakano on
MPC 9362 (elements on MPC 8289) requires correction by Delta-T = -0.66
day. An improved ephemeris follows:
1985 ET R.A. (1950.0) Decl. p r m1
July 14 1 34.96 + 2 08.9 1.714 1.966 18.1
24 1 53.77 + 3 11.0
Aug. 3 2 11.94 + 4 01.6 1.487 1.911 17.7
13 2 29.17 + 4 39.5
23 2 45.07 + 5 03.7 1.284 1.871 17.3
Sept. 2 2 59.17 + 5 14.2
12 3 10.98 + 5 11.6 1.112 1.846 16.9
22 3 19.94 + 4 57.6
Oct. 2 3 25.61 + 4 36.0 0.980 1.838 16.6
12 3 27.73 + 4 11.7
22 3 26.38 + 3 51.3 0.901 1.847 16.4
CPD -58 2721
J. S. Drilling, Louisiana State University; U. Heber, Universitat
Kiel; and C. S. Jeffery, St. Andrews University, report that
the extreme helium star CPD -58 2721 (Drilling 1980, Ap.J. 242,
L43) has changed in radial velocity by 138 +/- 10 km/s between 1983
May 30.1 and 1985 Apr. 9.1 UT. This result is based on high-
resolution spectra obtained at Cerro Tololo, the European Southern
Observatory and with the Anglo-Australian Telescope, and it suggests
that CPD -58 2721 is an H-deficient binary like nu Sgr and KS Per.
1985 July 23 (4086) Brian G. Marsden
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