Central Bureau for Astronomical Telegrams
IAUC 2985: A1707-27; FG Sge; 1976e
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Circular No. 2985
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
A1707-27
J. P. Pye, M. Elvis and G. R. Eadie, Physics Department, Leicester
University, report that observations of the galactic center
region with the Ariel 5 Sky Survey instrument during Aug. 27-Sept.
1 show a previously unobserved, relatively faint, x-ray source.
The 90-percent-confidence error box for the source location is
centered on l = 357o.0, b = +7o.4; has corners at 354o.6, +7o.8; 354o.6,
+7o.0; 359o.4, +7o.0; 359o.4, +7o.8; and area 0.4 square degrees.
Assuming the x-ray source to be at the center of the error box, the
intensity is about 10**-9 erg cm**-2 s**-1 (at 2-10 keV). The box
includes the high core density globular cluster NGC 6293.
FG SAGITTAE
J. D. Fernie, David Dunlap Observatory, writes that the time
rate of change of the B-V color index of this unique and astonishing
supergiant has recently slowed drastically. For ten years the
color index increased by over one magnitude at a linear rate in the
early 1970s of 0.16 magnitude yr**-1 (Fernie 1975, Astrophys. J. 200,
392). During the past year, however, the increase has been only
0.03 magnitude, to a value of B-V = +1.53 at 1976.5. The V magnitude
has remained roughly constant at 8.9-9.0 throughout, and the
other color indices have shown small increases. It would be of
interest if spectroscopic observations could be made of the star
during this change in activity and before the current season ends.
PERIODIC COMET D'ARREST (1976e)
The following precise positions have been reported:
1976 UT R. A. (1950) Decl. m1 Observer
June 26.68958 18 54 37.8 +21 52 00 15.5 Seki
28.57292 18 57 00.2 +21 59 36 14 "
28.65868 18 57 06.31 +21 59 54.9 13.5 Kojima
July 2.66354 19 02 38.73 +22 04 33.0 13 "
2.68750 19 02 40.52 +22 04 31.8 13 "
7.65868 19 10 46.79 +21 44 52.2 13 Seki
17.91726 19 33 47.86 +19 00 15.1 11.0 Mrkos
17.92322 19 33 48.77 +19 00 05.6 "
19.88759 19 39 30.97 +18 02 39.9 10.5 "
23.00417 19 49 36.5 +16 09 10 9.3 Apeldoorn
23.02500 19 49 40.0 +16 08 12 "
26.53795 20 02 51.11 +13 22 08.7 Urata
26.54015 20 02 52.33 +13 21 59.9 "
27.47118 20 06 42.91 +12 31 07.5 Herald
29.90191 20 17 25.43 + 9 59 05.9 9.1 Mrkos
29.90523 20 17 26.31 + 9 58 51.7 "
29.91858 20 17 46.38 + 9 53 53.5 7 South
30.59514 20 20 40.26 + 9 11 44.4 Urata
30.59122 20 20 40.88 + 9 11 36.3 "
30.92650 20 22 15.93 + 8 48 08.4 9.5 Mrkos
30.92841 20 22 16.40 + 8 48 00.3 Waterfield
31.94987 20 27 18.36 + 7 32 44.7 "
Aug. 1.88300 20 32 04.34 + 6 20 22.3 9.2 Mrkos
1.88456 20 32 04.85 + 6 20 15.7 "
3.02531 20 38 05.64 + 4 46 42.9 9.0 Vavrova
3.02174 20 38 06.39 + 4 46 31.5 "
14.45486 21 50 30.16 -14 18 34.9 Herald
14.57569 21 51 19.24 -14 32 31.6 Urata
14.57720 21 51 19.76 -14 32 40.6 "
15.91486 22 00 43.54 -16 51 57.3 Sutcliffe
16.54907 22 05 11.16 -11 56 24.4 Urata
16.55122 22 05 12.61 -17 56 31.3 "
18.57813 22 19 27.05 -21 13 59.1 Herald
18.57986 22 19 27.56 -21 14 09.6 "
23.60295 22 53 43.35 -28 17 28.6 5 Urata
23.60341 22 53 43.53 -28 17 30.3 "
T. Seki (Geisei) and N. Kojima (Ishiki). From Orient. Astron.
Assoc. Comet Bull. No. 132.
A. Mrkos and Vavrova (Klet Observatory).
B. Apeldoorn (Volkssterrewacht Simon Stevin, Hoeven, The Netherlands).
Long. = -4o33'50".0, Lat. = +51o34'02".5.
T. Urata (JCPM Yakiimo Station). 20-cm f/5.5 reflector (stopped
down on Aug. 16). From Nihondaira Obs. Circ. Nos. 780, 781, 793.
D. Herald (Kambah, near Canberra).
R. H. S. South, R. L. Waterfield and R. Sutcliffe (Woolston Observatory).
Measurers: Waterfield and G. H. Rutter. On July 29 the
outer coma was 5' in diameter, the inner coma 1'.5 and strongly
condensed; some elongation toward the northwestern quadrant.
Selected total visual magnitude estimates, coma diameters and
tail information: Aug. 5.29 UT, 6.0, 26', 0o.5 in p.a. 300o (J.
Bortle, Brooks Observatory, 10 x 50 binoculars); 12.36, 5.9, -, -
(D. Seargent, The Entrance, New South Wales, naked eye); 15.17,
5.8, 25', - (P. Maley, Houston, Texas, 7 x 35 binoculars); 18.11,
5.7, > 15', - (Bortle); 21.25, 5.8, 25', 1o.5 in 310o (Maley); 25.16,
5.4, 20'-30', - (Bortle); 21.25, 5.3, ~ 20', 1o.3 in 315o (Maley);
30.24, 5.1, > 18', - (Bortle); 31.24, 5.0, 20', - (Bortle); Sept.
3.29, 5.4, 15', 1o.8 in 320o (Maley); 6.45, 5.5, 18', 1o (Maley).
1976 September 9 (2985) Brian G. Marsden
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