Central Bureau for Astronomical Telegrams
IAUC 4856: NO N IN Sgr; NEW OH MEGAMASERS; 1989o
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Circular No. 4856
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
NO NOVA IN SAGITTARIUS
Several observers have reported nothing new in the area of
the suspected nova reported on IAUC 4855. R. H. McNaught, Siding
Spring Observatory, reports that the object is simply a missing
field star on the AAVSO (d) chart for VX Sgr, which Albrecht was
apparently using; the Papadopoulos photographic chart shows the
star as partially merged with (but distinct from) two nearby stars.
Examination of Schmidt survey films yields no evidence of
variability; a magnitude estimate from an Uppsala Schmidt photograph
taken Sept. 19.5 UT gives 10.5.
NEW OH MEGAMASERS
I. Kazes, Observatoire de Paris, Meudon; I. F. Mirabel,
Instituto de Astronomia y Fisica del Espacia, Buenos Aires, and
University of Puerto Rico; and F. Combes, Observatoire de Paris,
Meudon, telex: "New OH megamasers and H I emissions were discovered
in the galaxies IRAS 02483+4302, IRAS 03261-1422, and IRAS
15247-0945 with the Nancay radiotelescope. Physical characteristics
of the sources are, respectively: L(60 microns)/L(sun) = 1.93,
1.00, and 1.20 x 10E11; z = 0.052, 0.043, and 0.040; L(1667)/L(sun)
= 288, 105, and 124; L(1665)/L(sun) = 89, < 39, and < 18 (H = 75
km/s/Mpc). The center of IRAS 02483+4302 is about 14" from the
line of sight to the QSO 0248+430. H I absorption (tau = 0.014,
n(H I) = 1.4 x 10E18T_s cmE-2, with the spin temperature, T_s,
measured in K) has been detected, probably in front of the QSO,
with a linewidth of about 50 km/s. Nevertheless, it cannot be
ruled out that the absorption feature comes from H I in front of
the galaxy nucleus. The exact values of the optical absorption
velocities might discriminate between these two possibilities."
PERIODIC COMET BRORSEN-METCALF (1989o)
Total visual magnitude estimates (cf. IAUC 4851), with
observers citing twilight, moonlight, and low altitude: Sept. 13.51
UT, 6.2 (C. S. Morris, near Mt. Wilson, CA, 20x80 binoculars; very
faint 3-deg tail); 14.14, 5.8 (R. Haver, Monte Autore, Italy, 15x80
binoculars); 14.51, 6.3 (Morris; tail about 1.5 deg); 15.48, 6.3 (R.
Keen, Mt. Thorodin, CO, 8x40 binoculars); 18.50, 7.0: (A. Hale, Las
Cruces, NM, 0.41-m reflector).
1989 September 20 (4856) Daniel W. E. Green
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