Central Bureau for Astronomical Telegrams
IAUC 3521: SS 433; P/ENCKE; EPHEMS OF MINOR PLANETS FOR 1981
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Read IAUC 3522
Circular No. 3521
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
SS 433
R. E. Spencer, Jodrell Bank Observatory, communicates: "Mapping
observations with the 100-km-baseline multi-telescope radio-linked
interferometer at Jodrell Bank at wavelength 180 mm on Aug. 14 show
a triple structure with a pair of radio-emitting regions symmetrically
placed about an unresolved (< 0".2) core in p.a. 85o and with a
separation of 0".6. Later observations on Sept. 2 show that these
outer regions had increased in separation to 0".9 in the same p.a.
This implies an apparent velocity of 0.16 c for each of the outer
regions if SS 433 is at a distance of 3 kpc. Alternatively, the
distance is 4.9 kpc is the regions are moving at the same velocity
(0.26 c) as the optically-emitting clouds."
Corrigendum. On IAUC 3517, the name of the third collaborator
should read J. D. Romney.
PERIODIC COMET ENCKE
In the following ephemeris, from the elements on MPC 5129, the
total magnitude m1 is given (see also MPC 5323):
1980 ET R. A. (1950) Decl. Delta r m1
Oct. 8 5 01.55 +50 12.2 0.493 1.269 11.2
13 5 47.17 +55 10.4
18 7 06.88 +59 50.8 0.348 1.116 9.3
23 9 14.62 +60 14.2
28 11 21.96 +51 21.8 0.278 0.954 7.7
Nov. 2 12 40.86 +36 25.2
7 13 25.54 +21 55.9 0.336 0.780 7.2
12 13 53.32 +10 29.3
17 14 12.98 + 1 50.3 0.493 0.598 7.1
22 14 29.28 - 4 54.2
27 14 45.69 -10 28.9 0.727 0.424 7.3
Dec. 2 15 05.55 -15 22.4
7 15 31.61 -19 41.6 1.032 0.340 7.8
EPHEMERIDES OF MINOR PLANETS FOR 1981
Subscribers are advised that copies of Efemeridy Malykh Planet
for 1981 have now arrived from the Institute for Theoretical
Astronomy, Leningrad, and are available from the Minor Planet
Center/Central Telegram Bureau at the postal address given above.
1980 October 1 (3521) Brian G. Marsden
Read IAUC 3522
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