Central Bureau for Astronomical Telegrams
IAUC 4220: 1986 JK
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Read IAUC 4221
Circular No. 4220
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 617-495-7244/7440/7444
1986 JK
The following precise positions were measured by P. M.
Kilmartin from exposures by A. C. Gilmore in full moonlight at Mount
John University Observatory:
1986 UT R.A. (1950.0) Decl. B
May 23.49964 16 47 55.24 -22 24 49.2 13
23.50106 16 47 56.77 -22 24 56.2
The following orbital elements, by D. K. Yeomans, Jet Propulsion
Laboratory, are from the above pair plus 25 other observations
(most of them published in the May 23 MPCs) extending to May 20:
T = 1986 July 1.8000 ET Epoch = 1986 June 19.0 ET
Peri. = 232.4143 e = 0.684269
Node = 62.2412 1950.0 a = 2.840682 AU
Incl. = 2.1494 n = 0.2058592
q = 0.896892 AU P = 4.788 years
1986 ET R.A. (1950.0) Decl. p r V
May 30 22 12.07 -21 15.4 0.030 1.019 13.9
June 4 1 00.62 - 2 49.7
9 1 46.34 + 3 11.0 0.096 0.959 18.8
14 2 07.03 + 5 51.2
19 2 20.02 + 7 28.6 0.178 0.917 19.7
24 2 30.08 + 8 41.1
29 2 38.95 + 9 42.0 0.262 0.898 19.8
July 4 2 47.35 +10 36.7
9 2 55.52 +11 27.2 0.344 0.903 19.8
14 3 03.55 +12 14.3
19 3 11.40 +12 58.2 0.420 0.933 19.9
J. Drummond, Steward Observatory, communicates his prediction
for the peak of a possible meteor shower associated with 1986 JK
to occur near June 1.58 UT, with a radiant near R.A. = 14h44m, Decl. =
-10 deg (equinox 1950.0). Because of the object's low orbital
inclination, any shower should be searched for 1.5 days before and
after this estimated peak. The predicted low geocentric velocity
of 13 km/s for the meteors indicates that the zenithal attraction
should increase the altitude of the radiant by up to 15 deg when the
radiant is on the horizon; there would be a corresponding
attraction of 5 deg when the radiant is at altitude 45 deg.
1986 May 27 (4220) Brian G. Marsden
Read IAUC 4221
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