Central Bureau for Astronomical Telegrams
IAUC 4432: 1987A; V348 Sgr; 1986n
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Circular No. 4432
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
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
R. P. Norris, R. Wark, L. Taaffe, D. J. Cooke, G. Carrad, M.
R. Calabretta, M. J. Kesteven, D. L. Jauncey, E. Trouup, and A. E.
Wright, Division of Radiophysics, CSIRO; J. E. Reynolds, Mount
Stromlo and Siding Spring Observatories; and P. J. Hall, University
of Sydney, report that observations made with a 275-km interferometer
between the Parkes 64-m antenna and the 34-m DSS45 Tidbinbilla
antenna of the NASA Deep Space Network, and with a 0.416-km
interferometer using two antennas (DSS42 and DSS45) at Tidbinbilla,
place a 5-sigma upper limit of 8 mJy at 8.4 GHz, and 8 mJy at 2.3 GHz,
on the radio emission from SN 1987A on July 3. In addition, single
dish observations at 43 GHz using the Parkes 64-m antenna on July
23-24 place a 5-sigma upper limit of 500 mJy on the 43-GHz SN emission.
M. C. Storey, G. Carrad, D. J. Cooke, E. Troup, R. Wark, and
A. E. Wright, Division of Radiophysics, CSIRO, report that observations
made with the Parkes 64-m radio telescope at 22 GHz place a
5-sigma upper limit of 45 mJy on the continuum radio emission from SN
1987A on July 16, 17, 18, and 19. This fails to confirm the
reported detection at 22 GHz on June 20, 21, 22, and 25 by Kaufmann
et al. (IAUC 4412). The pointing of the telescope was accurately
calibrated using the nearby quasar PKS 0637-752. To check for
possible strong water vapor emission, the position of the SN was
observed in 100-MHz segments from 22.08 to 22.65 GHz, resulting in a
5-sigma upper limit of typically 80 mJy integrated over each segment.
V348 SAGITTARII
Visual magnitude estimates (cf. IAUC 4399): June 28.94 UT,
[15.0 (M. Verdenet, Bourbon-Lancy, France); July 24.89 UT, [13.8
(Verdenet); 25.38, 13.4 (P. Williams, Heathcote, N.S.W.); 26.95,
13.2 (Verdenet); 31.41, 12.9 (Williams).
COMET SORRELLS (1986n)
Total visual magnitude estimates (L = reflector): July 16.11
UT, 10.3 (J. E. Bortle, Stormville, NY, 0.32-m L); 18.26, 10.7 (J.
V. Scotti, Tucson, AZ, 0.41-m L); 19.31, 10.3 (C. S. Morris, Lockwood
Valley, CA, 0.26-m L, tail about 6' between p.a. about 45 deg, 150 deg);
29.11, 10.7 (Bortle); Aug. 2.92, 10.8 (M. V. Zanotta, near Como,
Italy, 0.30-m L); 13.17, 11.5 (A. Hale, Las Cruces, NM, 0.41-m L).
1987 August 13 (4432) Daniel W. E. Green
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