Central Bureau for Astronomical Telegrams
IAUC 2792: 1973l; 1975d; 1974c; N Sct 1975
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Circular No. 2792
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
PERIODIC COMET SCHWASSMANN-WACHMANN 2 (1973l)
The following precise positions have been reported:
1975 UT R.A. (1950) Decl. m2 Observer
Apr. 11.31181 12 29 38.39 + 2 43 32.8 Krumenaker
18.40000 12 25 22.84 + 3 08 10.9 15.7 Gilmore
A. C. Gilmore (Carter Observatory). 41-cm Cassegrain reflector.
L. Krumenaker (Warner and Swasey Observatory). 61-91-cm
Schmidt reflector.
COMET BRADFIELD (1975d)
The following precise positions have been reported:
1975 UT R.A. (1950) Decl. m2 Observer
May 5.31492 4 59 00.32 - 8 44 11.9 12.7 Kilmartin
5.32883 4 59 03.78 - 8 43 53.1 "
12.31190 5 28 27.09 - 6 25 07.9 13.3 Gilmore
12.32475 5 28 30.35 - 6 24 53.7 "
19.35611 5 56 43.10 - 4 12 39.9 Herald
19.36667 5 56 45.23 - 4 12 28.4 "
June 1.35833 6 44 45.51 - 0 39 30.0 "
A. C. Gilmore and P. M. Kilmartin (Carter Observatory). 41-cm
f/13.5 Cassegrain reflector.
D. Herald (Woden, near Canberra). 31-cm reflector.
COMET LOVAS (1974c)
A. C. Gilmore, Carter Observatory, communicates the following
precise observations obtained by him with a 41-cm Cassegrain
reflector:
1975 UT R.A. (1950) Decl. m2
May 12.39315* 13 22 39.86 -69 47 06.2 15.0
12.43968* 13 22 31.64 -69 47 19.9
22.45291 12 55 51.90 -70 15 58.6 15.2
22.47513 12 55 48.70 -70 16 00.4
* comet visible in Cassegrain as a very faint, diffuse patch about
1 arcmin in diameter.
NOVA SCUTI 1975
W. P. Bidelman reports that image-tube spectrograms covering
the 4700-6800 A region obtained on 1975 June 19 with the Warner
and Swasey 91-cm reflector by A. J. Weitenbeck, S-G. Lee, and
L. E. Krumenaker confirm the nova nature of Wild's object noted in
IAUC 2791. H-alpha and H-beta are strong and broad emission lines, of
widths about 55 and 30 A, respectively. The continuum is weak,
but absorption H-alpha centered about 35 A, or 1600 km/sec, from the
center of the emission appears to be present. [O I] 6300 A is
also seen, though weak.
Janet Mattei of the American Association of Variable Star
Observers reports that on two photographs taken by Peter Garnavich of
Bowie, Maryland, with a 200-mm focal length lens and Tri-X film on
June 9.18 UT the nova is well seen and its brightness is estimated
at about 7.3 to 7.4 by comparison with SAO 142879 and SAO 142699.
A Damon patrol plate exposed by J. H. Bulger at the Agassiz
Station, Harvard College Observatory, on June 11.206 UT shows the
nova. C.-Y. Shao finds it to be 7.2 ptg by visual examination.
C.-Y. Shao measured the following position of the nova on a
plate taken with the 41-cm astrograph:
R.A. = 18 52 44.15 Decl. = - 7 47 00.2 (1950)
Shao has identified a very blue star on the Palomar Sky Atlas
with an approximate magnitude 18.5 ptg at the position of the nova.
Photoelectric spectrum scans were obtained by R. E. McCrosky,
G. Schwartz, and C. A. Whitney on June 22.2 and 23.2 UT with the
150-cm reflector of Agassiz Station covering 6800-3500 A. The
spectrum shows broad emission of H, He I, N II, [N II], N III, [O I],
and an ultra-violet continuum.
Photoelectric photometry by C. A. Whitney on the Johnson system
with the 41-cm reflector of the Agassiz Station gives the following
magnitudes and colors relative to HD 175154 (SAO 142778):
1975 UT Delta-V Delta-(B - V)
June 20.183 -0.18 +0.12
21.188 -0.66 +0.16
21.264 -0.73 +0.16
21.299 -0.75 +0.13
22.240 -0.78 +0.13
23.275 -0.57 +0.12
One night's observations give the following results for
HD 175154: V = 9.03, B - V = +0.19.
1975 June 25 (2792) Owen Gingerich
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