Central Bureau for Astronomical Telegrams
IAUC 3493: 1980h; omicron And; V603 Aql
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Read IAUC 3494
Circular No. 3493
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
PERIODIC COMET TUTTLE (1980h)
C.-Y. Shao and G. Schwartz have recovered this comet on an
exposure with the 1.5-m reflector at Harvard College Observatory's
Agassiz Station as follows:
1980 UT R. A. (1950) Decl. m2
July 14.29247 2 12 55.60 +63 41 52.2 20
The object is diffuse with a trace of condensation, and its position
is in close agreement with the ephemeris on MPC 5324.
omicron ANDROMEDAE
R. Poeckert, Dominion Astrophysical Observatory, and A. F.
Gulliver, University of Alberta, report: "Spectrograms obtained at
the DAO indicate that omicron And (HD 217675) may be entering a shell
episode. On 1980 May 4 H-beta, H-gamma, Mg II 448.1 nm, Si II 412.8 and 413.1
nm showed narrow weak (~ 4 percent of continuum) absorption components.
On June 18 H-alpha had a central depth 25 percent higher than
normal, indicating a partial filling in of the photospheric line
(by envelope emission?). Spectroscopic, photometric and polarimetric
observations of omicron And should be initiated promptly."
V603 AQUILAE
M. H. Slovak, University of Texas at Austin, writes: "The old
nova V603 Aql (HD 174107) has been observed using high speed
photometers on the 0.76- and 0.91-m telescopes of McDonald Observatory.
The observations obtained of this close binary system on June 25
and 26 cover 1.5 orbital cycles (orbital period 3h19m.5). The
unfiltered light curves clearly show the existence of eclipses, as
first reported by Boggess et al. (IAUC 3485). The eclipses appear
relatively symmetric, having a central depth of 0.36 mag and lasting ~
33 min. Rapid flickering is still seen during mid-eclipse, indicating
that the hot spot in the system may not be eclipsed. The observed
times of mid-eclipse are JD (heliocentric) 2444415.9235 +/-
0.0003, orbital phase 0.931; 2444416.8178 +/- 0.0003, 0.386. The
phases are calculated from the spectroscopic ephemeris given by
Kraft (1964, Ap.J. 139, 457). Two comparison stars were used to
obtain the observations (BD +0 4022 and BD +0 4023) and to establish
the outside-eclipse magnitude of V603 Aql to be V = 10.35 +/- 0.04 at
the time of the observations."
1980 July 18 (3493) Daniel W. E. Green
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