Central Bureau for Astronomical Telegrams
IAUC 4761: Poss. Occn BY TITAN; SNe; Corrs
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Circular No. 4761
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
POSSIBLE OCCULTATION BY TITAN
L. H. Wasserman, Lowell Observatory, writes: "Based on a
suggestion by J. E. Westfall, Association of Lunar and Planetary
Observers, we have investigated the possibility that Titan will
occult 28 Sgr (SAO 187255) on 1989 July 3. Using the Jet Propulsion
Laboratory NAIF ephemeris for Titan and the Perth 70 star position,
we find a minimum geocentric separation of 1".18 on 1989 July 3.94555
UT. This result implies that an occultation will be visible in Europe,
but the uncertainties are such that Titan's shadow could miss the earth
entirely or produce an observable occultation anywhere Titan is above
the horizon in a dark sky (Africa, the Mediterranean, most of Europe,
and much of South America). For updated predictions, contact the author
at Lowell Observatory, 1400 W. Mars Hill Rd., Flagstaff, AZ 86001,
U.S.A. (SPAN address PERCY::LWASSERMAN)."
SUPERNOVAE
C. M. Gaskell and A. P. Koratkar, University of Michigan, report
the following CCD V magnitudes obtained at the Michigan/Dartmouth/MIT
Observatory, (all Mar. 13.5 UT): SN 1988Z in MCG +03-28-022, 17.45
+/- 0.17; SN 1989A in NGC 3687, 16.16 +/- 0.10; SN 1989B in NGC 3627,
13.69 +/- 0.07; SN 1989C in anonymous galaxy, 15.50 +/- 0.12; SN 1989D
in NGC 2963, 18.05 +/- 0.07.
C. Pollas, Observatoire de la Cote d'Azur, Caussols, reports
a magnitude estimate of SN 1989E in MCG +5-32-45 from a plate taken
by A. Maury with the 0.9-m Schmidt telescope: Mar. 11.11 UT, B = 19.4.
Visual magnitude estimates of SN 1987A in the Large Magellanic
Cloud (cf. IAUC 4747) by P. Williams, Heathcote, N.S.W.: Feb. 6.47 UT,
12.1; 9.46, 12.1; 15.49, 12.2; 24.44, 12.2; 28.43, 12.2; Mar. 7.46, 12.2.
CORRIGENDA
G 24-9. Delete the contribution by Carilli and Conner on
IAUC 4648. Under conditions of poor seeing, the star G 24-9
was confused with a fainter field star.
Periodic Comet Parker-Hartley (1987 XXXVI). On IAUC 4754,
line 2, for show the comet read shows that the comet
1989 March 24 (4761) Daniel W. E. Green
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