Central Bureau for Astronomical Telegrams
IAUC 4414: VY Aqr; WATER VAPOR MASER IN Sct; 1987A
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Circular No. 4414
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
VY AQUARII
Visual magnitude estimates: July 1.469 UT, 10.9 (R. McNaught,
Siding Spring Observatory); 1.54, 10.7 (D. A. J. Seargent, The
Entrance, N.S.W.); 1.687, 11.0 (McNaught); 1.691, 10.9 (A. Pearce,
Woodlands, Western Australia); 3.606, 13.2 (McNaught); 3.737, 13.5
(McNaught); 3.790, 13.6 (McNaught); 3.831, 13.7 (McNaught).
WATER VAPOR MASER IN SCUTUM
E. Scalise, Jr., and J. L. Monteiro do Vale, Instituto de
Pesquisas Espaciais Radio, Sao Paulo, report the discovery at the
Itapetinga Radio Observatory of one of the brightest water-vapor
masers. Located at R.A. = 18h38m32.3, Decl. = -5 12'00" (equinox 1950.0),
the maser is associated with IRAS 18385-0512. It was detected at
about 700 Jy (resolution 70 kHz) with LSR velocity = 17 km/s.
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
Corrigendum: on IAUC 4413, line 7, for 0".074 + 0".008 at
658.5 nm. read 0".074 +/- 0".008 at 658.5 nm.
Visual magnitude estimates: July 1.55 UT, 4.5 (Seargent); 3.35,
4.4 (A. Beresford, Adelaide, S. Australia); 3.75, 4.4 (McNaught).
COMET NISHIKAWA-TAKAMIZAWA-TAGO (1987c)
D. I. Olsson-Steel and B. A. Lindblad, Lund Observatory,
communicate: "This comet may be the parent of the epsilon Geminid meteor
shower. The theoretical radiant on Oct. 7, when the comet's orbit
is within 0.05 AU of the earth, is R.A. = 93 deg, Decl. = +28 deg (velocity
= 72 km/s). The displacement in R.A. from the epsilon Geminids, which
occur 10 days later, can be accommodated by the radiant diurnal motion.
Of immediate importance is the possibility of a shower at the other
node: the comet's orbit approaches the earth to within 0.12 AU on
July 21 with a theoretical radiant at R.A. = 35 deg, Decl. = +19 deg (same
velocity). Northern-hemisphere visual observations would be
difficult, since the radiant transit is at 6h40m local solar time."
Further total visual magnitude estimates (cf. IAUC 4402): June
7.72, 8.0 (G. W. Wolf, Wellington, N.Z., 7x50 binoculars); 12.70,
8.3 (Wolf); 15.24, 8.8 (A. Hale, Las Cruces, NM, 0.41-m reflector);
28.69, 9.2 (Wolf, 0.06-m refractor); July 1.70, 9.5 (Wolf).
1987 July 3 (4414) Daniel W. E. Green
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