Central Bureau for Astronomical Telegrams
IAUC 2824: Her X-1; Ser X-1; 1975h; 1975b
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Read IAUC 2825
Circular No. 2824
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
HERCULES X-1
P. J. Serlemitsos, Goddard Space Fliqht Center, reports that
data from the celestial x-ray spectrometer on OSO-8 show that Her
X-1 turned on in its 35-day cycle on Aug. 28 between 7h10m and
10h29m UT. This was before phase 0.5 of the binary period.
Observations by several x-ray instruments on OSO-8 are in progress,
and supporting ground-based measurements would be highly desirable.
SERPENS X-1
A. Davidsen, Johns Hopkins University, reports that a faint
object (B ~ 18.5) with an ultraviolet excess has been found on
plates taken with the Crossley reflector of the Lick Observatory
near the new position for Ser X-1 (3U 1837+04) reported by Doxsey
(IAUC 2820). Approximate coordinates (+/- 5") of this optical candidate
for Ser X-1 are R.A. = 18h37m29s.4, Decl. = + 4o59'29" (equinox
1950.0). Nearby stars 12" south and 11" northwest are about a
magnitude brighter than the candidate.
COMET KOBAYASHI-BERGER-MILON (1975h)
Further precise positions have been reported as follows:
1975 UT R. A. (1950) Decl. m1 Observer
July 30.85588 14 14 05.76 +57 12 58.9 5.3 Mrkos
31.01143 14 10 57.25 +57 04 38.0 "
31.88586 13 54 31.86 +56 16 21.1 5.0 "
31.88725 13 54 30.63 +56 16 17.5 "
31.91964 13 53 56.28 +56 14 23.9 Ferreri
31.94111 13 53 33.88 +56 13 07.8 "
Aug. 2.88989 13 23 54.17 +54 17 15.9 Schoenmaker
3.87402 13 11 43.04 +53 18 18.6 5.0 Mrkos
3.87483 13 11 42.28 +53 18 12.9 "
5.97706 12 50 19.33 +51 16 36.2 4.9 "
6.85041 12 42 53.54 +50 28 46.2 4.9 "
6.85185 12 42 52.33 +50 28 41.4 "
7.93837 12 34 33.42 +49 31 17.2 4.8 "
7.93912 12 34 33.33 +49 31 13.4 "
8.86834 12 28 07.35 +48 44 10.8 4.7 "
8.87251 12 28 05.72 +48 43 59.6 "
9.85324 12 21 53.03 +47 56 13.0 4.7 "
9.85440 12 21 52.44 +47 56 11.5 "
10.84479 12 16 06.77 +47 09 49.7 4.5 "
10.84549 12 16 06.39 +47 09 44.5 "
12.86896 12 05 35.17 +45 40 01.0 4.4 "
12.87185 12 05 34.38 +45 39 54.0 "
13.86979 12 00 52.79 +44 57 48.4 "
13.87118 12 00 52.39 +44 57 43.4 "
14.84968 11 56 31.28 +44 17 30.0 Debehogne
14.86492 11 56 27.32 +44 16 51.3 "
15.86154 11 52 15.07 +43 36 53.2 4.3 Mrkos
15.86218 11 52 14.64 +43 36 50.1 "
16.84396 11 48 16.82 +42 58 05.2 4.1 "
16.84477 11 48 16.64 +42 58 01.7 "
20.84438 11 33 29.18 +40 23 11.6 Debehogne
20.85547 11 33 26.80 +40 22 45.6 "
A. Mrkos (Klet Observatory).
W. Ferreri (Pino Torinese Observatory).
A. A. Schoenmaker (Leiden Observatory). 33-cm refractor. Communicated
A. Blaauw.
H. Debehogne (Royal Observatory, Uccle). 40-cm f/5 astrograph.
Further selected total visual maqnitude estimates, coma diameters
and tail information: Aug. 19.07 UT, 4.7, -, 2o in p.a. 46o
(J. Bortle, Brooks Observatory, 10 x 50 binoculars); 19.19, 4.3, -,
> 6o in 67o (M. J. Mayo and J. Truxton, Apoura, California, 7 x 35
binoculars); 20.09, 4.7, 5', 1o in 47o (Bortle); 20.17, 4.3, -, 7o
in 65o (Mayo and Truxton); 21.19, 4.3, -, 6o in 60o (Mayo and
Truxton); 23.06, 4.7, 2.12, 75' in 38o (Bortle); 23.17, 4.3, -, 5o
in 56o (Mayo and Truxton); 24.08, 5.0, -, - (K. Simmons, Jacksonville,
Florida, 14 x 100 binoculars); 25.07, 5.1, 5', 35' in 40o
(C. Sherrod, North Little Rock, Arkansas, 15-cm refractor); 25.17,
4.4, -, 8o in 67o (Mayo and Truxton); 26.17, 4.2, -, 9o in 65o
(Mayo and Truxton); 27.07, 4.6, -, 4o in 31o (P. Maley, Houston,
Texas, 7 x 35 binoculars); 27.17, 4.0, 5', 9o in 65o (Mayo and
Truxton); 28.16, 4.0, 5', 9o in 60o (Mayo and Truxton).
PERIODIC COMET WEST-KOHOUTEK-IKEMURA (1975b)
Further precise positions have been reported as follows:
1975 UT R. A. (1950) Decl. m1 Observer
Apr. 11.09236 4 52 39.66 +34 40 32.1 Krumenaker
11.13056 4 52 48.09 +34 41 17.9 McCrosky
18.03125 5 17 01.54 +36 36 50.9 "
May 4.95049 6 19 06.67 +39 46 24.4 15.3 South
L. Krumenaker (Warner and Swasey Observatory, Nassau Station).
R. E. McCrosky (Harvard Colleqe Observatory, Agassiz Station).
155-cm reflector. Measurer: J. H. Bulger.
R. H. S. South (Woolston Observatory). Measurer: R. L. Waterfield.
1975 August 29 (2824) Brian G. Marsden
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