Central Bureau for Astronomical Telegrams
IAUC 3446: HR 8752; Obs OF COMETS; 1979i
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Read IAUC 3447
Circular No. 3446
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 617-864-5758
HR 8752
S. Barden and L. W. Ramsey, Department of Astronomy, Pennsylvania
State University, write: "SIT spectra (dispersion 0.15 x 10**-6)
obtained with the eche1le spectrograph on the 1.6-m telescope
indicate a rapid change in the emission-line spectrum of HR 8752. A
spectrum obtained on Jan. 8.00 UT shows conspicuous Ca I 657.2-nm
and Fe I 657.4-nm emission. About 48 hr later (Jan. 9.95 UT) the
Ca I emission was entirely absent. More subtle changes were also
apparent in the H-alpha profile."
OBSERVATIONS OF COMETS
O. V. Dobrovol'skij, Institute of Astrophysics, Dushanbe,
writes: "Photoelectric BV photometry has been performed of two
recent comets by Kiselev, Chernova, Narizhnaya and Tup'eva at the
Gissar Astronomical Observatory. Observations of periodic comet
Ashbrook-Jackson (1978 XIV) in the phase-angle range 2o.1 < alpha < 25o.3
and of comet Meier (1978 XXI) in the range 2o.8 < alpha < 12o.4 clearly
revealed the presence of an opposition effect in cometary atmospheres.
In the V band the change between alpha ~ 12o and alpha ~ 2o is ~
0.5 mag for both comets."
COMET MEIER (1979i)
Further observations through 1979 Dec. 25 show that the orbit
of this comet departs significantly from a parabola and thus that
the ephemeris (IAUC 3424, MPC 5039-5040) is running off. New
elliptical elements (e = 0.9737) will appear on the 1980 Feb. 1 MPCs.
The corresponding ephemeris is as follows:
1980 ET R. A. (1950) Decl. Delta r m2
Jan. 2 9 04.49 +45 04.9 0.892 1.784 17.8
12 8 10.75 +38 20.3
22 7 29.67 +30 41.4 0.984 1.953 18.4
Feb. 1 7 02.12 +23 43.3
11 6 45.32 +18 09.1 1.287 2.136 19.3
21 6 36.27 +13 57.2
Mar. 2 6 32.68 +10 49.9 1.711 2.327 20.3
12 6 32.93 + 8 28.7
22 6 35.94 + 6 39.1 2.186 2.524 21.2
1980 January 18 (3446) Brian G. Marsden
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