Central Bureau for Astronomical Telegrams
IAUC 4390: (1566); 1982i
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Circular No. 4390
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
(1566) ICARUS
I. I. Shapiro, Center for Astrophysics, writes: "This year's
close (0.16 AU) approach to the earth represents an important
opportunity for testing general relativity through measurement of
Icarus' perihelion advance. Icarus should become observable about
mid-June, and early observations will be especially valuable in
preparing a radar ephemeris for observations scheduled at Arecibo
Observatory during June 20-25. Data reaching the Central Telegram
Bureau/Minor Planet Center as late as June 23 will be used in
refining the ephemeris for the remaining radar observations." The
following ephemeris is based on that in EMP 1987 (p. 344, q.v.). The
elongation increases from 32.9 deg to 80.6 deg and the phase angle
decreases from 139.3 deg to 89.7 deg during June 14-24.
1987 ET R. A. (1950) Decl. Delta r V
June 14 7 35.15 +41 47.0 0.212 0.846 19.7
15 7 58.33 +41 17.3
16 8 23.69 +40 23.1 0.188 0.879 18.7
17 8 50.85 +38 58.6
18 9 19.20 +36 59.6 0.171 0.911 17.6
19 9 47.93 +34 24.2
20 10 16.17 +31 14.7 0.162 0.943 16.7
21 10 43.15 +27 37.3
22 11 08.27 +23 41.7 0.162 0.973 16.1
23 11 31.22 +19 38.9
24 11 51.89 +15 39.1 0.171 1.003 15.8
PERIODIC COMET HALLEY (1982i)
M. Kidger, Instituto de Astrofisica de Canarias, La Laguna,
Tenerife, reports: "Observations of P/Halley were made on Mar. 31
and Apr. 1 using an RCA CCD at the prime focus of the 2.5-m Isaac
Newton Telescope at La Palma. Both the 400-s R-band exposure and
the 900-s B-band exposure on Apr. 1 show that, beyond a diameter of
about 1', the coma is strongly asymmetric, being elongated in p.a. about
30 deg; the coma diameter along the east-west axis was about 3'. There is
a broad, faint tail (also p.a. 30 deg) which, in the R exposure,
extends at least to the edge of the field of view (length > 4'). In
the B exposure, the tail is shorter and fainter (partially due to
the lower sensitivity of the CCD in the blue), but can be traced
out to about 3'."
1987 May 14 (4390) Daniel W. E. Green
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