Central Bureau for Astronomical Telegrams
IAUC 4801: Occn OF 28 Sgr BY TITAN
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Read IAUC 4802
Circular No. 4801
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
Numerous observations of this event (cf. IAUC 4761) have been
received. In addition to those tabulated below, positive reports
have been received from observers in Naples, Italy; Barcelona,
Spain; and the Canary Islands (M. Kidger reports that at Tenerife
the atmospheric occultation, or fading, was longer than the disk,
or total, occultation). Below is a list of available timings
(given as UT + July 3d22h); t1 and t4 are the beginning and end
times of the star's fading, and t2 and t3 are the beginning and
end times of the total occultation. Some observers noted a central
flash of light. S. Boyle states that the Mill Hill estimates
are +/- 1 s, those observers noting that 28 Sgr changed in color
from orange to blue-white during the fade in brightness.
Observer t1 t2 flash t3 t4
Appleby 39m0s 40m00s
Brierley 39 59.0 42m09.9 44m18.6
Debehogne 44 21.1
Geyer 38 52 39 43 41 36 43 44 44m43s
Griffen 39 31 40 10 44 05 44 48
Hurst 39 29 40 00 42 08 44 14 45 05
Schlyter 38 20 38 50 41 00 43 05 43 45
Smalley 39 22 43 50 44 55
Smith 39 19 44 49
Wonnacott 39 24 44 56
G. Appleby (Royal Greenwich Observatory). Satellite Laser Ranger
Telescope, Herstmonceux. Central brightening of about 1 mag
lasted about 10 s.
D. Brierley (Malvern, England). Long. = -2.3264 deg, Lat. =
+52.1358 deg, h = 70 m. 0.07-m telescope.
H. Debehogne and A. Dekersgieter (Observatoire Royal de Belgique,
Uccle).
E. H. Geyer and M. Hoffmann (Hoher List Observatory). 1.06-m
telescope. Second central flash at 41m40s.
I. Griffin, B. Smalley, K. C. Smith, and D. Wonnacott (U. of
London Obs., Mill Hill). 0.61-m f/11 refractor (268x), 0.20-m
f/10 reflector (167x), 0.15-m f/11 refr. (66x), and 0.20-m f/10
refl. (111x), respectively.
G. M. Hurst and M. Hurst (Basingstoke, England). 15x80
binoculars. Flickering noted during pre-occultation fading
and at 44m47s.
P. Schlyter (Stockholm). Central flash was 'probable'.
1989 July 5 (4801) Daniel W. E. Green
Read IAUC 4802
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