Central Bureau for Astronomical Telegrams
IAUC 3233: 1977o; 1978c; 4U 1626-67
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Read IAUC 3234
Circular No. 3233
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
PERIODIC COMET SCHUSTER (1977o)
The following precise positions have been reported:
1977/78 UT R. A. (1950) Decl. m2 Observer
Oct. 16.42572 23 27 51.11 -35 10 49.0 15.9 Gilmore
Jan. 2.54514 0 26 36.79 - 0 55 48.1 Candy
A. C. Gilmore (Carter Observatory). Measurer: P. M. Kilmartin.
M. P. Candy (Perth Observatory, Bickley). 33-cm astrograph.
COMET BRADFIELD (1978c)
Further precise positions have been reported as follows:
1978 UT R. A. (1950) Decl. Observer
Feb. 15.85660 19h34m10s49 -41 00 09.4 Verveer
16.81701 19 40 10.34 -39 59 34.7 "
20.85521 20 04 47.24 -35 19 17.9 Jekabsons
20.86233 20 04 49.65 -35 18 48.1 "
21.81979 20 10 31.92 -34 06 17.4 "
27.85382 20 45 35.20 -25 39 18.7 Johnson
27.85851 20 45 36.87 -25 38 51.3 "
28.86719 20 51 23.34 -24 06 10.6 "
28.86858 20 51 23.35 -24 06 07.8 "
Mar. 1.38265 20 54 19.59 -23 18 10.8 Torres
1.86684 20 57 05.13 -22 32 31.4 Johnson
1.86823 20 57 05.70 -22 32 25.7 "
2.38230 21 00 01.74 -21 43 32.6 Torres
2.87587 21 02 50.88 -20 56 06.2 Johnson
2.87813 21 02 51.62 -20 55 54.4 "
3.87170 21 08 32.51 -19 19 17.8 Candy
3.87240 21 08 32.73 -19 19 13.7 "
4.86580 21 14 14.73 -17 41 11.4 "
4.87292 21 14 17.07 -17 40 28.5 "
5.87552 21 20 03.88 -16 00 12.2 "
5.87622 21 20 04.15 -16 00 07.4 "
6.87836 21 25 53.28 -14 18 49.4 "
6.87905 21 25 53.48 -14 18 44.3 "
8.87309 21 37 37.27 -10 54 51.9 "
8.87650 21 37 38.55 -10 54 29.9 "
9.40521 21 40 47.73 -10 00 07.2 Torres
12.88559 22 02 07.97 - 4 03 11.1 Candy
12.88762 22 02 08.93 - 4 02 57.9 "
A. Verveer, P. Jekabsons, J. Johnson and M. P. Candy (Perth Observatory).
A 10-min exposure on Mar. 2 showed a tail 40' long (to
edge of plate) in p.a. 330o. A 25-min exposure on Mar. 3 showed
the main tail 70' long in p.a. 332o, with narrow spines extending
10' in p.a. 327o and 15' in p.a. 337o.
C. Torres (Cerro Calan Observatory). Measurer: M. Wischnjewsky.
Mar. 1: tail 30' long in p.a. 230o.
The following parabolic elements, by the undersigned, are from
72 observations Feb. 6 to Mar. 12:
T = 1978 Mar. 17.6906 ET Peri. = 48.7131
Node = 259.7942 1950.0
q = 0.436585 AU Incl. = 51.0869
1978/79 ET R. A. (1950) Decl. Delta r m2
July 31 6 11.62 +23 36.6 3.307 2.535 17.6
Aug. 10 6 21.82 +22 42.3
20 6 30.38 +21 47.4 3.362 2.808 18.1
30 6 37.28 +20 51.9
Sept. 9 6 42.43 +19 56.3 3.345 3.069 18.5
19 6 45.72 +19 00.8
29 6 47.04 +18 05.8 3.276 3.322 18.8
Oct. 9 6 46.27 +17 11.4
19 6 43.34 +16 18.3 3.188 3.567 19.0
29 6 38.25 +15 26.6
Nov. 8 6 31.10 +14 37.2 3.129 3.805 19.3
18 6 22.20 +13 50.6
28 6 11.97 +13 07.9 3.150 4.037 19.6
Dec. 8 6 01.03 +12 29.9
18 5 50.06 +11 57.8 3.295 4.263 19.9
28 5 39.73 +11 32.2
Jan. 7 5 30.59 +11 13.5 3.578 4.484 20.3
m2 = 11.0 + 5 log Delta + 10 log r
4U 1626-67
S. A. Ilovaisky, C. Motch and C. Chevalier, Observatoire de
Meudon, report that Fourier analysis of fast (0.9-s resolution)
photometry of McClintock et al's suggested optical candidate (a
blue star of V = 18.6) for the 7.7-s x-ray pulsar 4U 1626-67,
obtained with the European Southern Observatory's 360-cm reflector in
white light on May 3, shows optical pulsations with a period of
(7.681 +/- 0.008) s and a full amplitude of 2 percent. The pulse
light curve shows a broad pulse with an indication of structure.
The above value of the period is fully consistent with an extrapolation
of the SAS-3 x-ray period using the spin-up rate derived by
Rappaport et al. (1977, Astrophys. J. 217, L29).
1978 June 27 (3233) Brian G. Marsden
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