Central Bureau for Astronomical Telegrams
IAUC 3743: 1982f; Millisec PULSAR IN 4C 21.53; Z And
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Read IAUC 3744
Circular No. 3743
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
PERIODIC COMET CHURYUMOV-GERASIMENKO (1982f)
Further observations have shown that the orbital solution
given on IAUC 3731 is unsatisfactory, with the comet now some 20"
west of the ephemeris. The following improved result is based on
a total of 69 observations (through 1982 Nov. 8) and yields
nongravitational parameters A1 = +0.01 +/- 0.09, A2 = +0.0125 +/- 0.0020.
A computation from 36 observations during 1975-1982 alone (and
ignoring nongravitational effects) is practically identical.
T = 1982 Nov. 12.0996 ET Epoch 1982 Nov. 7.0 ET
Peri. = 11.3244 e = 0.629153
Node = 50.3592 1950.0 a = 3.522053 AU
Incl. = 7.1130 n = 0.1491112
q = 1.306142 AU P = 6.610 years
M. Wallis, University College, Cardiff, telexes that his
observations with IUE on Nov. 7.59 UT gave a fine-error-sensor
(blue, central region) mag of 12.4. The corresponding mag for
Comet Austin (1982g) was 14.3. On the other hand, the ultraviolet
spectra showed that comet 1982f was less bright in OH than comet
1982g by one magnitude, yet unlike comet 1982g had continuum and
molecular ultraviolet emissions.
MILLISECOND PULSAR IN 4C 21.53
D. Backer, S. Kulkarni and C. Heiles, University of California
at Berkeley: M. Davis, Arecibo Ionospheric Observatory: and M.
Goss, University of Groningen, report the detection of a millisecond
pulsar in 4C 21.53. The period was 0.001557708 s on Sept.
25. The period derivative is 3 . 10**-14, and the dispersion measure
is 100 e pc cm**-3. Arecibo observations at 1400 MHz show deep
fading from iss over 5 MHz and 10 min. The position from VLA
observations is R.A. = 19h37m28s72, Decl. = +21deg28'01".3 (equinox
1950.0).
Z ANDROMEDAE
With reference to the item on IAUC 3738, J. Bortle, Stormville,
NY, remarks that this star does not seem to have had a recent
photometric outburst. His visual magnitude estimates follow:
June 15.1 UT, 10.8; July 22.1, 10.9; Aug. 17.1, 10.8; Sept. 10.1,
10.8; Oct. 11.1, 10.9; Oct. 22.0, 10.8; Nov. 3.0, 10.8.
1982 November 12 (3743) Brian G. Marsden
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