Central Bureau for Astronomical Telegrams
IAUC 3031: V1500 Cyg; Aql X-1; P/SCHWASSMANN-WACHMANN 1; 1976g; 1976d; Obs OF MINOR PLANETS
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Read IAUC 3032
Circular No. 3031
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 Telex: 921428
Telephone: (617) 864-5758
V1500 CYGNI
P. Tempesti, Collurania Observatory, writes: "Photoelectric
observations performed with the Teramo refractor on 1976 Dec. 13 and
covering a complete cycle of the 3-hr short period light variation
show an amplitude of 0.52 magnitude in V, much greater than ever
reported before. The period appears to have shortened from 0d.141 at
the time of early decline to 0d.130,confirming the gradual decrease
found by Semeniuk et al. (1976, Inf. Bull. Variable Stars No. 1157).
Moreover, there is an indication of light modulation of shorter
period and mean amplitude about 0.06 magnitude. The mean V magnitude
on 1976 Dec. 13.8 UT was 12.85 +/- 0.03."
Recent visual magnitude estimates: Jan. 1.98 UT, 12.4 (J.
Bortle, Brooks Observatory); 11.08, 12.4 (S. O'Meara, Harvard
College Observatory); 18.06, 12.4 (O'Meara); 21.01, 12.5 (Bortle).
AQUILA X-1
S. S. Holt and L. J. Kaluzienski, Laboratory for High Energy
Astrophysics, Goddard Space Flight Center, report the confirmation
of flaring activity in Aql X-1 = 3U 1908+00 from the Ariel 5 all-sky
monitor. Following a private communication from M. Watson,
University of Leicester, that the Ariel 5 sky survey instrument
showed an increase in intensity over a few days up to a level of
0.15 times the Crab on Jan. 9, the all-sky monitor data were
interrogated from the appearance of Aql X-1 at the edge of the
experiment field of view on Jan. 12. Data obtained during Jan 12-15
are consistent with a constant source intensity of 0.3 times the
Crab, at least three times less than the extended maxima of the
flaring episodes of June 1975 and June 1976 (cf. IAUC 2788, 2965).
PERIODIC COMET SCHWASSMANN-WACHMANN 1
The following precise positions have been reported:
1976 UT R. A. (1950) Decl. m1 Observer
Oct. 30.62222 3 12 54.42 +29 22 20.8 11.5 Seki
31.75833 3 12 19.4 +29 20 44 11.5 "
Nov. 29.62826 2 57 24.62 +28 18 08.7 14.5 "
Dec. 19.81321 2 49 46.00 +27 22 24.5 12.7 Mrkos
19.82756 2 49 45.88 +27 22 23.4 "
20.77826 2 49 30.48 +27 19 51.3 12.7 "
20.78914 2 49 30.26 +27 19 50.5 "
21.71711 2 49 16.18 +27 17 25.0 12.9 "
21.73134 2 49 15.82 +27 17 23.0 "
22.77201 2 49 00.34 +27 14 36.7 12.7 "
22.78347 2 49 00.12 +27 14 35.8 "
25.74153 2 48 21.00 +27 06 58.1 12.9 "
27.75478 2 47 57.75 +27 02 01.1 13.0 "
T. Seki (Kochi Observatory, Geisei Station). From Orient. Astron.
Assoc. Comet Bull. No. 139.
A. Mrkos (Klet Observatory).
J. Bortle, Brooks Observatory, provides further visual magnitude
estimates (32-cm reflector): 1976 Dec. 24.99 UT, 12.4 (stellar
nucleus 14.1); 27.17, 12.4 (no nucleus); 1977 Jan. 9.00, [13.5.
COMET HARLAN (1976g)
Further precise positions have been reported as follows:
1976 UT R. A. (1950) Decl. m2 Observer
July 19.12279 13 16 42.66 +21 36 05.7 Shao
Sept.18.31962 14 44 42.48 - 7 11 35.4 14.7 Gilmore
Oct. 24.35391 16 09 22.75 -23 46 20.6 "
C. Y. Shao (Harvard College Observatory, Agassiz Station).
A. C. Gilmore (Carter Observatory). 41-cm reflector. Measurer:
P. M. Kilmartin. Oct. 24 image very diffuse.
COMET BRADFIELD (1976d)
The following precise positions were obtained by C. Torres at
the University of Chile's Cerro El Roble Station:
1976 UT R. A. (1950) Decl.
Mar. 27.06248 4 14 22.80 -14 27 44.8
28.03114 4 18 51.90 -13 03 58.4
OBSERVATIONS OF MINOR PLANETS
The following precise positions of 1963 UA and 1975 YA were
obtained by E. Roemer and L. M. Vaughn with the Steward Observatory's
229-cm reflector, Kitt Peak. Measurer: C. D. Vesely.
Object 1976 UT R. A. (1950) Decl. Mag.
1963 UA June 26.37216 23 29 06.92 +11 33 04.1 19.6
26.39259 23 29 09.82 +11 33 26.1
27.40851 23 31 30.38 +11 50 52.3 19.7
1975 YA June 25.29840 18 41 09.55 -32 01 25.1
25.30887 18 41 04.84 -32 02 36.0
1977 January 26 (3031) Brian G. Marsden
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