Central Bureau for Astronomical Telegrams
IAUC 5448: A1118-61; 1992 BC
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Circular No. 5448
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
A1118-61
N. Lund, S. Brandt, and A. J. Castro-Tirado, communicate, on
behalf of the Granat WATCH collaboration (Danish Space Research
Institute, Lyngby, and Space Research Institute, Moscow): "The
transient x-ray pulsar A1118-61, originally discovered by the Ariel V
satellite in 1974, has been observed again by the WATCH all-sky
monitor on Granat. The source was observed above the detection limit
(about 100 mCrab) between Jan. 28 and 30. The peak flux in the
8- to 20-keV band was 500 mCrab. The period of the pulsar was
determined as 406.4 +/- 0.2 s (Ariel V obtained 405.3 +/- 0.6 s).
A1118-61 has been associated with the Be star He 3-640 (Henize 1976,
Ap.J. Suppl. 30, 491). Follow-up observations are encouraged."
1992 BC
Improved orbital elements from MPC 19688:
T = 1992 Apr. 1.122 TT Peri. = 77.000
e = 0.35110 Node = 123.546 2000.0
q = 0.92072 AU Incl. = 14.304
a = 1.41890 AU n = 0.583144 P = 1.69 years
1992 TT R. A. (2000) Decl. Delta r Elong. Phase V
Feb. 8 10 07.42 +55 09.7 0.105 1.068 139.2 37.1 15.8
10 10 29.17 +61 29.9 0.104 1.059 132.0 43.8 15.9
12 11 02.00 +67 31.3 0.103 1.050 124.8 50.6 16.1
14 11 53.9 +72 43.5 0.105 1.040 117.8 57.1 16.3
16 13 14.9 +76 20.5 0.108 1.032 111.2 63.3 16.5
18 14 59.7 +77 29.7 0.112 1.023 105.1 68.9 16.7
20 16 33.9 +76 11.0 0.117 1.014 99.5 73.9 17.0
22 17 37.6 +73 28.4 0.123 1.006 94.6 78.4 17.2
24 18 17.8 +70 17.7 0.129 0.998 90.3 82.3 17.4
26 18 44.09 +67 05.5 0.136 0.991 86.4 85.7 17.7
28 19 02.25 +64 02.5 0.144 0.984 83.1 88.6 17.9
Mar. 4 19 29.84 +57 20.3 0.164 0.967 76.6 93.9 18.3
9 19 45.91 +51 50.7 0.185 0.952 72.1 97.3 18.7
14 19 57.29 +47 15.3 0.206 0.940 69.0 99.1 19.0
19 20 06.66 +43 19.1 0.228 0.931 67.2 99.8 19.3
1992 February 12 (5448) Daniel W. E. Green
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