Central Bureau for Astronomical Telegrams
IAUC 3067: 1977f; 1977 HB; 1977 HA; X-RAY BURSTS; N Sgr 1977
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Read IAUC 3068
Circular No. 3067
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
COMET KOWAL (1977f)
The following precise positions have been reported:
1977 UT R. A. (1950) Decl. m2 Observer
Apr. 24.39271 14 02 11.04 -12 54 41.4 Kowal
25.39583 14 01 40.12 -12 52 37.2 "
26.35104 14 01 10.4 -12 50 41 18 Harlan
26.36389 14 01 10.33 -12 50 36.4 Kowal
C. T. Kowal (Hale Observatories). Time of discovery observation
given incorrectly on IAUC 3066 (1977 HB was found on the same
75-min exposure!). Tail is 2' long to northwest, not northeast.
E. A. Harlan (Lick Observatory). Extremely weak, but small image
on 72-min exposure. 51-cm astrograph. Measurer: A. R. Klemola.
The comet's orbit is completely indeterminate, and it is
unclear whether the comet is a relatively close short-period one or
a very distant long-period one (with retrograde motion). The
following alternative ephemerides, by the undersigned, may serve to
identify the comet during the next dark of the moon:
(1) (2)
1977 ET R.A. (1950) Decl. R.A. (1950) Decl.
Apr. 27 14 00.87 -12 49.2 14 00.84 -12 49.3
May 7 13 56.04 -12 29.5 13 55.77 -12 28.5
17 13 52.91 -12 17.8 13 50.91 -12 08.4
27 13 52.89 -12 21.7 13 46.38 -11 49.5
1977 HB
The following precise positions have been reported:
1977 UT R. A. (1950) Decl. Observer
Apr. 24.36667 13 58 41.89 -12 53 18.7 Kowal
24.41875 13 58 26.51 -12 54 16.8 "
25.31250 13 54 19.96 -13 11 08.8 "
25.36458 13 54 05.25 -13 12 04.4 "
26.30208 13 49 59.38 -13 28 39.9 Giclas
26.34028 13 49 48.7 -13 29 14 Bowell
26.34201 13 49 48.42 -13 29 21.4 Giclas
26.35694 13 49 44.37 -13 29 32.7 Kowal
26.37083 13 49 40.86 -13 29 45.4 "
C. T. Kowal (Hale Observatories). Beginning and end of trails.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
E. Bowell (Lowell Observatory). V = 14.79, B-V = +0.84.
The orbit of this object is also indeterminate, although it
seems probable that the object is of Apollo type. Two alternative
ephemerides, by the undersigned, follow:
(1) (2)
1977 ET R.A. (1950) Decl. R.A. (1950) Decl.
Apr. 27 13 47.06 -13 40.2 13 47.08 -13 39.9
May 2 13 29.01 -14 49.3 13 29.26 -14 48.7
7 13 15.44 -15 39.7 13 16.25 -15 38.9
12 13 05.45 -16 18.1 13 07.14 -16 17.4
17 12 58.29 -16 48.9 13 01.18 -16 49.1
22 12 53.40 -17 15.4 12 57.78 -17 17.1
27 12 50.32 -17 39.3 12 56.44 -17 43.7
1977 HA
The following precise positions have been obtained by H. L.
Giclas at the Lowell Observatory. Measurer: M. L. Kantz.
1977 UT R. A. (1950) Decl.
Apr. 22.32292 13 12 59.46 +34 39 44.4
25.30903 13 18 28.79 +34 09 33.7
25.34514 13 18 31.61 +34 09 09.9
X-RAY BURSTS
N. E. White and S. J. Burnell, Mullard Space Science Laboratory;
and G. Carpenter, Birmingham University, report that Ariel 5
observations during Apr. 17-21 reveal x-ray bursts occurring
irregularly on a timescale of minutes. The field of view includes the
positions of MXB1728-33 and MXB1730-335. The detector is slightly
offset from the satellite's spin axis, and the spin modulation of
the bursts is consistent with their originating from MXB1730-335.
The intensity, structure and occurrence rate are all the same as in
the previous outburst of this source.
NOVA SAGITTARII 1977
R. R. D. Austin, Mount John University Observatory, provides
the following photoelectric observations, obtained with the 61-cm
reflector: Mar. 31.69 UT, V = 8.94, B-V = +0.33, U-B = -0.55; Apr.
4.70, 9.34, +0.27, -0.65; 5.70, 9.58, +0.25, -0.67. Comparisons
were SAO 187068 (8.14, +0.54, +0.07) and 187087 (9.93, +1.15, +0.61).
1977 April 29 (3067) Brian G. Marsden
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