Central Bureau for Astronomical Telegrams
IAUC 3210: LSI+61 303 AND GT 0236+610; LP 182-44; P/ENCKE; P/SCHWASSMANN-WACHMANN 1
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Read IAUC 3211
Circular No. 3210
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
LSI+61 303 AND GT 0236+610
S. Rossiger, Sonneberg Observatory, reports that the star LSI
+61 303, suspected as being the optical counterpart of the variable
radio source GT 0236+610 (IAUC 3170, 3180) and possibly of the gamma-ray
source CG 135+1 (IAUC 3164), shows no indication of variability
greater than +/- 0.2 magnitude on 535 Sonneberg Sky Patrol plates
from 1958 to the present. On 1978 Mar. 28.85 UT the star was observed
photoelectrically at V = 10.72, B = 11.54, U = 11.29. The
comparison star was No. 3 in NGC 1027 (Hoag et al. 1961, Publ. U.S.
Naval Obs. 2nd Ser. 17, part 7). The mean error of the difference
between the stars is +/- 0.01 magnitude in V and B, i/- 0.05 magnitude
in U. In comparison Drilling (1975, Astron. J. 80, 128) gives V =
10.79, B = 11.60, U = 11.27 for LSI+61 303 during 1973 Sept. 16-25.
LP 182-44
W. J. Luyten and A. E. La Bonte, University of Minnesota,
write that they have found a faint blue star with annual proper motion
0".254 in p.a. 217o at the position R.A. = 18h35m35s, Decl. = +50o46'.1
(equinox 1950.0). On two red plates it is estimated to be at
magnitude 19.1, and on two available blue plates it appears to be at
18.7. While the position in the sky, as well as the direction of
the motion, suggest that it is a high-velocity star, a normal white
dwarf this blue would be expected to have an absolute magnitude not
fainter than +9, in which case its tangential velocity would be
1200 km/s - directed mainly toward the galactic center. Since the
object appears of the same brightness on two different blue plates
taken more than one month apart, a flare star is virtually ruled
out. Other possibilities are that it has a peculiar spectrum -
strong in the blue and violet but deficient in the red - or that it
has a much lower luminosity than normal white dwarfs of its color.
PERIODIC COMET ENCKE
The following ephemeris, by B. G. Marsden, is from Handb. Br.
Astron. Assoc. for 1978:
1978 ET R. A. (1950) Decl. Delta r m2
June 1 22 54.73 - 9 29.5 3.176 3.307 20.1
11 22 55.67 - 9 21.4
21 22 54.66 - 9 24.9 2.963 3.410 20.0
July 1 22 51.59 - 9 40.3
11 22 46.37 -10 07.5 2.777 3.504 19.8
21 22 39.08 -10 45.6
31 22 29.96 -11 32.1 2.662 3.590 19.6
Aug. 10 22 19.45 -12 23.7
20 22 08.22 -13 16.2 2.659 3.669 19.5
30 21 57.01 -14 05.4
Sept. 9 21 46.59 -14 47.8 2.787 3.741 19.8
19 21 37.61 -15 21.1
29 21 30.48 -15 44.3 3.033 3.805 20.1
Oct. 9 21 25.44 -15 57.5
19 21 22.51 -16 01.1 3.362 3.863 20.5
29 21 21.59 -15 56.3
Nov. 8 21 22.50 -15 43.7 3.731 3.914 20.8
The following precise positions were obtained by A. C. Gilmore
at the Carter Observatory. Measurer: P. M. Kilmartin.
1977 UT R. A. (1950) Decl. m2
Sept.11.30215 13 12 04.94 -14 46 00.3 12.5
11.31327 13 12 09.56 -14 46 32.1
Oct. 9.33521 16 01 50.64 -27 43 56.7 15.3
9.35973 16 01 58.07 -27 44 12.0
14.35050 16 25 49.58 -28 28 14.6 15.4
PERIODIC COMET SCHWASSMANN-WACHMANN 1
The following precise positions were obtained by A. Mrkos and
Z. Vavrova at the Klet Observatory:
1978 UT R. A. (1950) Decl. Mag. Observer
Feb. 27.78940 4 53 30.91 +29 48 19.1 13.2 Mrkos
27.80093 4 53 31.07 +29 48 18.4 "
28.78395 4 53 44.67 +29 47 00.7 13.1 "
28.79552 4 53 44.86 +29 47 00.5 "
Mar. 2.80979 4 54 14.93 +29 44 24.8 13.3 "
2.82125 4 54 15.01 +29 44 23.6 "
3.79841 4 54 30.74 +29 43 09.9 13.6 "
3.80709 4 54 30.89 +29 43 06.1 "
4.83590 4 54 48.25 +29 41 54.0 14.0 "
4.84458 4 54 48.42 +29 41 50.2 "
10.81101 4 56 42.71 +29 35 03.2 12.8 Vavrova
10.82315 4 56 42.96 +29 35 01.9 "
11.80964 4 57 04.23 +29 33 59.4 12.6 "
11.81867 4 57 04.38 +29 33 58.6 "
12.78013 4 57 25.68 +29 32 58.5 12.8 Mrkos
12.78759 4 57 25.85 +29 32 58.1
Total visual magnitude estimates by J. Bortle, Brooks Observatory
(32-cm reflector): Mar. 14.05, 12.5; Apr. 3.04, 12.4; 8.0, [13.
1978 April 20 (3210) Brian G. Marsden
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