Central Bureau for Astronomical Telegrams
IAUC 5206: 1986 III; 1991a; SW UMa
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 5207
Circular No. 5206
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET HALLEY (1986 III)
E. Giraud, European Southern Observatory, communicates: "I
obtained two 15-min R exposures and a 20-min V exposure with the 2.2-m
ESO/Max-Planck-Institut telescope under photometric conditions on
Feb. 17.2 UT. The magnitude of the comet, measured in a diameter of
5", was V = 19.88, V-R = +0.59. The data were calibrated using 3
Landolt stars and a secondary calibrator of magnitude V = 21.37.
The error in V-R should be +/- 0.05. These data show that the comet
color is close to solar (possibly slightly redder)."
A. Smette, ESO, La Silla, reports: "A 30-min spectrogram (range
350-550 nm, resolution 9.0 nm FWHM) was obtained with the New Technology
Telescope (NTT) on Feb. 22.14 UT, using a 9" slit. Reduction,
and subtraction to eliminate the contribution of a contaminating
star, yields a coma that presents a solar-type spectrum with no
obvious emission line, strongly suggesting a dust composition."
O. Hainaut, ESO, La Silla; and R. M. West, ESO, Garching,
report: "CCD photometry under good photometric conditions (seeing
about 1") with the 3.6-m NTT at La Silla gives for P/Halley the
following preliminary magnitudes (within a 5".3 diameter) on Mar. 6.1
UT: V = 21.9, V-R = +0.5. The total magnitude is V about 19.3.
The coma shape is unchanged since Feb. 12 (cf. IAUC 5189)."
PERIODIC COMET METCALF-BREWINGTON (1991a)
Total visual magnitude estimates (cf. IAUC 5181): Feb. 5.80
UT, 9.2 (B. H. Granslo, Blindern, Norway, 0.20-m reflector); 14.12,
9.5 (A. Hale, Las Cruces, NM, 0.41-m reflector); 22.15, 9.7 (Hale);
Mar. 4.16, 10.2 (Hale).
SW URSAE MAJORIS
Visual magnitude estimates (cf. IAUC 5199): Feb. 26.53 UT, 10.8
(M. Koshiro, Suwa, Japan); Mar. 3.80, 10.8 (M. Verdenet, Bourbon-
Lancy, France); 5.24, 11.3 (G. Dyck, N. Dartmouth, MA); 6.12, 11.8
(P. Sventek, Houston, TX); 9.04, 12.1 (P. Schmeer, Bischmisheim,
Germany); 10.87, 12.9 (Schmeer); 11.91, [13.5 (Schmeer).
1991 March 12 (5206) Daniel W. E. Green
Read IAUC 5207
Our Web policy. Index to the CBAT/MPC/ICQ pages.
