Central Bureau for Astronomical Telegrams
IAUC 3492: Poss. SN IN Vir CLUSTER; Cyg X-1; 2A 0526-328; (1943)
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Read IAUC 3493
Circular No. 3492
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 617-864-5758
POSSIBLE SUPERNOVA IN VIRGO CLUSTER
J. Kristian, Hale Observatories, reports that M. Rosker has
discovered a possible supernova 7' east of NGC 4374 and 8' west and
3' south of NGC 4406, at R.A. = 12h23m.1, Decl. = +13o10' (equinox 1950.0).
The object was of mv 14 on June 13 and July 12. A spectrum taken
by Horace Smith tentatively suggests a type I supernova.
CYGNUS X-1
J. C. Kemp, M. S. Barbour and R. E. McBirney, Physics Department,
University of Oregon, report: "Over 20 nights of optical data
were obtained during May 25-July 7. Relative to our mean 1977-80
UBV light curves, we see no average change in brightness during
this presumed x-ray high state (IAUC 3491) in any color, to within
0.005 mag. There is a possible brightening of the second maximum
(phase 0.75), relative to the first maximum, by ~ 0.01 mag. However,
any changes are scarcely outside the always-present intrinsic
scatter of 0.015 mag. Our u light curve suggests more activity.
The V-band polarization shows unusual excursions of up to 0.4 percent
relative to the mean curve (Kemp et al. 1979, AP.J. 228, L23),
notably around phase 0.7; it is premature to claim a systematic
change."
2A 0526-328
P. W. Hill, Anglo-Australian Observatory, reports: "Radial
velocity measurements of Balmer lines from the optical counterpart
of 2A 0526-328 (Charles et al. 1979, Ap.J. 231, L131) made during
1980 Feb. with the Anglo-Australian Telescope by J. G. Greenhill and
D. J. Watts, University of Tasmania, and myself, indicate a period of
4h.7 +/- 0h.1, which differs from Motch's photometric period of 5h.186
or 4h.26 (cf. IAUC 3427). We urge further spectroscopy and
photometry over a long time base to resolve this discordance."
(1943) ANTEROS
J. Degewij writes:. "This earth-approaching asteroid has been
identified as a potential target for rendezvous by a spacecraft.
Observers are urged to obtain photometry and spectrophotometry
during the current relatively favorable opposition. For further
information contact me at Jet Propulsion Laboratory 183-501, Pasadena,
CA 91103, U.S.A."
1980 July 18 (3492) Daniel W. E. Green
Read IAUC 3493
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