Central Bureau for Astronomical Telegrams
IAUC 6060: X-RAY N IN Sco; 1994m
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Circular No. 6060
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
X-RAY NOVA IN SCORPIUS
C. Bailyn, S. Jogee, and J. Orosz, Department of Astronomy,
Yale University, report: "We have continued to observe the optical
nova reported on IAUC 6050. Revised astrometry yields a position
of R.A. = 16h54m00s.13, Decl. = -39 50'45".2 (equinox 2000.0), < 2"
from the radio position reported by Hjellming (IAUC 6055) and well
within the expected errors of the HST guide stars used as a basis
of our astrometry. Between Aug. 10 and 16, the nova declined in
magnitude from V = 14.5 to 15.0, while its color remained within
0.02 of V-I = +1.83. Further photometry of a possible eclipse:
Aug. 17.018 UT, V = 14.74, V-I = +1.87; 17.068, 14.95, +1.94;
17.175, 14.90, +1.93; 17.221, 14.64, +1.83. We monitored the nova
for a 5-hr period on each of the following four nights, during
which time it was within 0.1 mag of V = 14.1 with a color between
V-I = +1.80 and +1.85. Over a 4-hr span on Aug. 22, the nova was
at V = 14.4. Our run at Cerro Tololo is now complete, and we
strongly encourage other observers to monitor the further
development of this interesting source."
R. M. Hjellming, National Radio Astronomy Observatory, reports
the results of 10-km Very Large Array radio observations of the
field of GRO J1655-40: "Observations on Aug. 18.2 and 19.06 UT at
frequencies of 1.4, 4.9, 8.4, 14.9, and 22.5 GHz show the total
fluxes to be 5.5, 2.5, 1.6, 1.0, and 0.6 Jy, respectively, on the
first day, and 3.9, 1.8, 1.3, 0.9, and 0.6 Jy on the second day.
At all frequencies except 1.4 GHz, the radio source was resolved;
on Aug. 18.2 its angular size was 0".2, and on Aug. 19.06, 0".3.
The 22.5-GHz image on Aug. 19.06 shows an apparent double source
with separation of 0".3 and a position angle of 42 deg, with the
southwest component twice the strength of the northeast component.
If the expansion was linear, it began roughly on Aug. 16, and the
apparent separation was increasing by 0".1 per day."
COMET NAKAMURA-NISHIMURA-MACHHOLZ (1994m)
Further total visual magnitude estimates: Aug. 5.90 UT, 8.5
(R. Haver, Monte Serra, Italy, 15x80 binoculars); 8.95, 8.5 (A.
Diepvens, Balen, Belgium, 0.15-m refractor); 11.24, 7.8 (C. E.
Spratt, Victoria, BC, 0.20-m reflector); 16.02, 8.5 (Diepvens);
18.23, 8.1 (Spratt).
1994 August 24 (6060) Daniel W. E. Green
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