Central Bureau for Astronomical Telegrams
IAUC 4559: 1988G; X2127+119 AND PULSAR IN M15; 1986 III
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Circular No. 4559
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 1988G IN ANONYMOUS GALAXY
Jean Mueller and Jeff Phinney, Palomar Observatory, report the
discovery of a supernova, mpg about 17-18, in an anonymous galaxy (R.A. =
13h28m25.7, Decl. = +32 10'31", equinox 1950.0), located 6".7 east and
3".3 south of the galaxy's center. The measured position of the supernova
is R.A. = 13h28m25.1, Decl. = +32 10'26" (equinox 1950.0, accuracy
about 2"). The object was discovered on a Feb. 25 plate with the 1.2-m
Oschin Schmidt telescope in the course of the Sky Survey II. A
low-dispersion spectrum, obtained by N. Reid, Palomar Observatory,
and G. Wegner, Dartmouth College, on Mar. 4 UT with the 5-m Hale
reflector (+ double spectrograph + CCD), shows the strong 614.0-nm
Si II feature characteristic of type-I supernovae, and the spectral
energy distribution suggests that the supernova is near maximum
light. J. R. Mould derived the following magnitude and color with
the CCD camera on the Palomar 1.52-m reflector on Mar. 5: B about 15.8,
B-V about 0.0.
X2127+119 AND PULSAR IN M15
M. Auriere, Pic du Midi Observatory; M. Geffert, Hoher List
Observatory; and L. Koch-Miramond, Astrophysics Laboratory, Institute
for Fundamental Research, Saclay, telex: "The published position
of the radio pulsar in the direction of M15 (IAUC 4552) is 2".1
away from the Einstein satellite position for X2127+119 (Grindlay
et al. 1984, Ap.J. 282, L13). Optical identification of X2127+119
with AC 211 (Ilovaisky et al. 1987, A.Ap. 179, L1) enables us to
give a refined position for it: R.A. = 21h27m33.278, Decl. = +11 56'51.00
(equinox 1950.0, AGK3 system; accuracy +/- 0".25). The published
position of the radio pulsar is thus 3".3 away from the M15 x-ray
source. The accuracy of the radio position is needed in order to
conclude if a possible identification of the two objects can be
ruled out on astrometric grounds."
PERIODIC COMET HALLEY (1986 III)
S. Larson and D. Levy, Lunar and Planetary Laboratory, report
CCD photometry of P/Halley obtained Feb. 23.3 UT with the Catalina
1.5-m reflector (+ Gunn g filter): m1 = 17.2 +/- 0.2 in an aperture
that included all of the 40"-diameter coma. Levy estimated m1 =
16.8 visually with the same telescope.
1988 March 7 (4559) Daniel W. E. Green
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