Central Bureau for Astronomical Telegrams
IAUC 3033: 1916 I = 1977a; 1977b; JUPITER XIII (LEDA); PKS 0735+178
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Read IAUC 3034
Circular No. 3033
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
PERIODIC COMET TAYLOR (1916 I = 1977a)
C. Kowal, Hale Observatories, reports that on Jan. 25 he
identified images of this comet, not observed since its discovery
apparition, on exposures with the 122-cm Schmidt telescope at Palomar,
as shown below. The object is diffuse with condensation but no tail.
1976 UT R. A. (1950) Decl. m1
Dec. 13.26979 6 51 48.69 +11 27 45.4 16
14.30434 6 51 18.40 +11 42 52.1 16
Current predictions for P/Taylor, derived by N. A. Belyaev and
V. V. Emel'yanenko from the original work by Jeffers (1922, Lick
Obs. Bull. 10, 120), are given in Handb. Br. Astron. Assoc. for
1976. These predictions, as well as computations by B. G. Marsden,
suggest that Kowal's object is the comet's component B (the correction
to the published prediction being Delta-T ~ -1.4 days), which in
any case is believed to be the principal component (Sekanina 1976,
Cent. Astrophys. Prepr. No. 530). The following elements, which involve
a slight adjustment to the 1977 predictions, satisfy Kowal's
two observations within 1". Kowal also reports that he searched
for component A, but he failed to recover it.
T = 1977 Jan. 11.544 ET
Peri. = 355.613 e = 0.46534
Node = 108.214 1950.0 a = 3.65040 AU
Incl. = 20.556 n = 0.141317
q = 1.95172 AU P = 6.97 years
1976/77 ET R. A. (1950) Decl. Delta r m1
Nov. 18 6 53.93 + 7 13.2 1.223 2.004 16.5
28 6 55.55 + 8 28.2
Dec. 8 6 53.93 +10 16.6 1.060 1.973 16.1
18 6 49.29 +12 39.9
28 6 42.41 +15 33.0 0.978 1.956 15.9
Jan. 7 6 34.69 +18 43.5
17 6 27.77 +21 55.3 0.999 1.952 15.9
27 6 23.22 +24 53.7
Feb. 6 6 22.18 +27 29.4 1.116 1.963 16.2
16 6 25.06 +29 38.9
26 6 31.86 +31 21.8 1.303 1.988 16.6
Mar. 8 6 42.23 +32 39.6
18 6 55.59 +33 34.0 1.532 2.027 17.0
28 7 11.39 +34 06.7
Apr. 7 7 29.07 +34 19.1 1.786 2.077 17.4
17 7 48.09 +34 12.6
27 8 08.03 +33 48.6 2.051 2.137 17.9
May 7 8 28.48 +33 08.7
17 8 49.15 +32 14.4 2.319 2.206 18.3
27 9 09.80 +31 07.4
June 6 9 30.26 +29 49.6 2.585 2.282 18.6
16 9 50.40 +28 22.7
26 10 10.17 +26 48.2 2.843 2.365 19.0
m1 = 13.0 + 5 log Delta + 10 log r
PERIODIC COMET GRIGG-SKJELLERUP (1977b)
M. P. Candy, Perth Observatory, cables that P. Jekabsons has
recovered this comet on plates taken with the 33-cm astrograph, as
shown below; the object was diffuse with condensation but no tail.
An independent recovery has been reported by A. C. Gilmore and
P. M. Kilmartin using the 41-cm reflector at the Carter Observatory.
1977 UT R. A. (1950) Decl. m1 m2 Observer
Jan. 21.73495 9 44 43.97 -37 55 26.9 18 Jekabsons
25.61562 9 47 12.46 -40 14 18.5 18 "
26.53805 9 47 47.15 -40 47 55.8 18 Gilmore
26.58183 9 47 48.87 -40 49 30.3 "
These positions are in close agreement with G. Sitarski's prediction
on IAUC 2992, the indicated correction being Delta-T = -0.005 day.
JUPITER XIII (LEDA)
C. Kowal, Hale Observatories, provides the following precise
positions, obtained with the 122-cm Schmidt telescope at Palomar:
1976 UT R. A. (1950) Decl.
Nov. 2.48125 3 38 45.78 +18 48 30.6
Dec. 13.22917 3 18 41.50 +17 39 04.1
PKS 0735+178
T. D. Kinman, Kitt Peak National Observatory, reports that the
BL-Lac object PKS 0735+178 = VRO 17.07.02, which generally varies
between B = 15.3 and 16.7, was found to be unusually bright at B =
15.0 on Jan. 15 UT, and it had a very high linear polarization of
32 percent on Jan. 14. On Jan. 25 the object had brightened to B =
14.7, and its light was 23-percent polarized. PKS 0735+178 is one
of the very few BL-Lac objects with red-shifted absorption lines
(Carswell et al. 1974, Astrophys. J. 190, L101).
1977 January 28 (3033) Brian G. Marsden
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