Central Bureau for Astronomical Telegrams
IAUC 4809: Occn OF 28 Sgr BY TITAN; 1989M
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Read IAUC 4810
Circular No. 4809
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
OCCULTATION OF 28 SAGITTARII BY TITAN
Additional reported timings (cf. IAUC 4801, 4803, etc.):
Observer t1 t2 central t3 t4
flash
Arlot 41 55
Lecacheux 42 10
Shanklin 39 13 40 32 41 47 43 46
Stapleton 39 16.3 39 24 41 59 44 33.8 45 27
J. E. Arlot, W. Thuillot, F. Roques, F. Sevres (Paris-Meudon).
1-m and 0.6-m telescopes. Communicated by B. Sicardy. Half-
light (half-intensity) times for the star's disappearance and
reappearance are 39m24s and 44m28s; 28 Sgr was detected
continuously until the central flash, a double-peaked feature
with maxima at 41m55s and 41m58s. At both Meudon and Pic du
Midi, the intensity of the flash is strongly wavelength-dependent,
decreasing from the near-infrared to the blue, and the lightcurves
are asymmetric with respect to the middle of the occultation.
J. Lecacheux, B. Sicardy, F. Colas, J. L. Vidal, C. Buil, A.
Klotz, E. Thouvenot, J. Bourgeois (Pic du Midi). 2-m, 1-m, 0.6-m,
and 0.25-m telescopes. Half-intensity times for disappearance
and reappearance are 39m35s and 44m57s; 28 Sgr was detected
continuously until the central flash, a double-peaked feature
with maxima at 41m55s and 41m58s.
J. D. Shanklin (U. of Cambridge Observatories). 0.20-m Thorrowgood
refractor (+ photometer); noisy signal. Central peak lasted
from 41m47s to 42m23s. Half of maximum intensity occurred at
39m24s and 44m45s.
J. R. Stapleton (St. Andrews University Observatory). Long. =
-2 49'48.0, Lat. = +56 20'12.0, h about 40m. 0.10-m reflector.
Seeing moderate to poor. Turbulence of 28 Sgr increased at
37m30s. Central flash lasted 1-2 s.
SUPERNOVA 1989M IN NGC 4579
A. Cassatella reports two corrigenda concerning the item on
IAUC 4808: (1) the second date should read July 8.84 (instead of
July 7.84; lines 4, 8, and 12); (2) on line 9, for 0.184 and 0.173
erg cm-2 s-1 nm-1 read 0.184 and 0.173 x 10E-14 erg cm-2 s-1 nm-1.
Visual magnitude estimates: July 7.21 UT, 12.0 (A. Hale, Las
Cruces, NM); 9.14, 12.2 (J. Griese, Stamford, CT); 9.14, 12.2 (C.
Scovil, Stamford, CT); 10.10, 12.1 (P. Sventek, Houston, TX).
1989 July 12 (4809) Daniel W. E. Green
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