Central Bureau for Astronomical Telegrams
IAUC 3010: X-RAY BURSTS; P/SCHWASSMANN-WACHMANN 1; 1976e; 1975e
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Read IAUC 3011
Circular No. 3010
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
X-RAY BURSTS
J. H. Swank, R. H. Becker, S. H. Pravdo, J. R. Saba and P. J.
Serlemitsos, Goddard Space Flight Center, report observations by
OSO 8 of four 2-20 keV x-ray burst sources, as shown below. C denotes
the peak count rate (in units of the Crab), N the number of
bursts observed, Delta-T the intervals between bursts and Delta-t the decay
time. The positional uncertainty is generally several degrees.
Dates l b C N Delta-T (d) Delta-t (s)
1975 Sept.-1976 Sept. 344o0 -1o8 1-2 5 0.006-190 20-30
1976 Mar. 22-25 4 -4 1 4 0.86-1.1 30
Apr. 11-14 31 -8 0.5 11 0.16-0.25 5-10
Oct. 8 26.0 -3.8 1.5 1 _ 10-20
PERIODIC COMET SCHWASSMANN-WACHMANN 1
J. Bortle, Brooks Observatory, reports the probable occurrence
of another small outburst (cf. IAUC 3007). His observation on Nov.
17.07 UT showed a perfectly stellar condensation; it had expanded
to diameter ~ 10" on Nov.19 and was subsequently invisible (32-cm
reflector). Total magnitudes: Nov. 19.10, 11.8; 22.12, 11.9.
PERIODIC COMET D'ARREST (1976e)
Further precise positions have been reported as follows:
1976 UT R. A. (1950) Decl. Observer
Aug. 14.20483 21 48 42.91 -13 52 26.8 Debehogne
14.27963 21 49 12.46 -14 00 21.1 "
15.02954 21 54 32.00 -15 19 00.5 "
15.37420 21 56 51.05 -15 54 57.1 "
16.17652 22 02 33.60 -17 17 36.1 "
16.18344 22 02 36.50 -17 18 18.5 "
19.15109 22 23 28.28 -22 07 34.6 "
19.15325 22 23 29.20 -22 07 47.7 "
20.20307 22 30 46.66 -23 42 39.9 "
20.20627 22 30 47.47 -23 42 50.9 "
Oct. 12.76215 1 07 20.25 -37 14 59.0 Hers
12.77257 1 07 20.54 -37 14 52.8 "
14.75556 1 08 15.95 -36 43 54.3 Candy
15.84722 1 08 47.05 -36 26 21.2 Hers
20.69438 1 10 49.40 -35 03 10.9 Candy
20.72929 1 10 50.02 -35 02 37.0 "
24.79583 1 12 29.25 -33 47 39.3 Hers
Nov 1.68611 1 15 47.75 -31 12 11.0 Jekabsons
H. Debehogne, J. and A. Surdej, G. Roman and M. Pizarro (European
Southern observatory). Measurers: J. and A. Surdej.
J. Hers (Linden Observatory). 20-cm reflector.
M. P. Candy and P. Jekabsons (Perth Observatory, Bickley).
Ten-minute exposures by E. Roemer with the Lunar and Planetary
Laboratory's 154-cm reflector on Oct. 26 showed well condensed images
(in fairly good seeing for the altitude) of m2 ~ 15.2. Total
visual magnitudes by Bortle: Nov. 13.09 UT, 9.9; 21.10, 10.2.
PERIODIC COMET SMIRNOVA-CHERNYKH (1975e)
Ephemeris from Handb. Br. Astron. Assoc. for 1977:
1977 ET R. A. (1950) Decl. Delta r m2
Jan. 17 16 51.34 -21 14.6 4.628 3.958 19.3
27 17 02.26 -21 37.0
Feb. 6 17 12.47 -21 55.7 4.420 3.982 19.2
16 17 21.84 -22 11.3
26 17 30.19 -22 24.4 4.168 4.006 19.1
Mar. 8 17 37.36 -22 35.5
18 17 43.20 -22 45.4 3.893 4.031 19.0
28 17 47.54 -22 54.5
Apr. 7 17 50.24 -23 03.4 3.619 4.056 18.9
17 17 51.19 -23 12.5
27 17 50.34 -23 21.9 3.378 4.080 18.8
May 7 17 47.71 -23 31.4
17 17 43.47 -23 40.7 3.203 4.105 18.7
27 17 37.88 -23 49.2
June 6 17 31.39 -23 56.3 3.124 4.130 18.6
16 17 24.49 -24 01.8
26 17 17.75 -24 05.8 3.160 4.155 18.7
July 6 17 11.73 -24 08.6
16 17 06.85 -24 11.1 3.307 4.179 18.8
26 17 03.44 -24 14.0
Aug. 5 17 01.68 -24 18.0 3.544 4.204 19.0
15 17 01.62 -24 23.4
25 17 03.25 -24 30.3 3.840 4.228 19.2
Sept. 4 17 06.48 -24 38.7
14 17 11.19 -24 48.1 4.162 4.252 19.4
24 17 17.23 -24 58.0
Oct. 4 17 24.45 -25 07.9 4.483 4.276 19.6
14 17 32.72 -25 17.1
24 17 41.89 -25 25.1 4.778 4.299 19.7
Nov. 3 17 51.82 -25 31.4
13 18 02.39 -25 35.4 5.027 4.323 19.9
1976 November 26 (3010) Brian G. Marsden
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