Central Bureau for Astronomical Telegrams
IAUC 3381: COMET ON PSS; COORDINATED Obs OF BL Lac; V1668 Cyg
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Read IAUC 3382
Circular No. 3381
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
COMET ON PALOMAR SKY SURVEY
R. Weinberger and G. Auner, University Observatory and
Astronomical Institute, Innsbruck, write that images of a probable comet,
not previously reported, appear on the Palomar Sky Survey prints No.
979. On the 40-min E exposure a somewhat diffuse trail ~ 0'.5 in
length can be seen. On the 12-min O exposure, the object is a
slightly diffuse and elongated weak spot with a mean diameter of
~ 7" and without condensation; the object on this latter eposure is
estimated to be of magnitude 19.5 +/- 1. A very faint tail in p.a.
~ 110o, roughly 1' long, can be seen on the O print. From this same
exposure the position is determined (uncertainty +/- 5") to be:
1954 UT R.A. (1950) Decl.
Feb. 11.45625 12 27 56.7 -25 23 30
or at x = 296 mm and y = 122 mm from the lower left corner; the
above time and position are for the middle of the exposure. The
daily motion is 17' +/- 3' in a direction 13o +/- 3o north of west.
COORDINATED OBSERVATIONS OF BL LACERTAE
R. Angel, Steward Observatory, writes: "Simultaneous photometric
and polarimetric observations of BL Lac have been scheduled at
several observatories for the entire week of Sept. 19-25. In an
effort to obtain nearly continuous coverage, the optical polarization
will be measured throughout each night from the Wise Observatory
in Israel and at the University of Arizona. Similarly, continuous
optical photometric measurements will be made from Arizona and
from Teneriffe. Further observations in the optical or at other
wavelengths, and from other sites (particularly China and Japan),
made during this period would be of high value, and we hope other
observers can join this effort. Interested individuals should contact
me at the Steward Observatory, University of Arizona, Tucson,
AZ 85721, U.S.A.; telephone (602) 626-1563."
V1668 CYGNI
J. Mattei, American Association of Variable Star Observers,
reports the following visual magnitude estimates: June 13.11 UT, 12.6
(J. DeYoung, Palmyra, VA; this name was given incorrectly on IAUC
3318 and 3372); 13.28, 12.5 (C. Stephan, Solon, OH).
1979 July 23 (3381) Daniel W. E. Green
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