Central Bureau for Astronomical Telegrams
IAUC 4092: 1985j; 1985a; 1984e
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Circular No. 4092
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
PERIODIC COMET DANIEL (1985j)
J. Gibson reports his recovery of this comet with the 1.6-m
reflector at Palomar and CCD as shown below. The object is stellar
in appearance within the limits of seeing, except for the July
28.485 image, which shows 5" streamers in p.a. 255 and 285. The
correction to the ephemeris on MPC 9695 (elements by B. G. Marsden
on MPC 8273; see also Nakano Note No. 451) is Delta-T = -0.05 day.
1985 UT R.A. (1950.0) Decl. m2
July 27.48785 6 12 40.03 +24 53 16.0 20
27.49102 6 12 40.54 +24 53 16.8
28.48486 6 15 43.97 +25 00 24.4
28.48861 6 15 44.61 +25 00 25.7
29.48792 6 18 49.25 +25 07 22.8
29.49167 6 18 49.89 +25 07 24.7
PERIODIC COMET ASHBROOK-JACKSON (1985a)
Total visual magnitude estimates: July 25.38 UT, ~ 12.5 (J.
Young and S. Grossman, Table Mountain Observatory, 0.61-m reflector);
Aug. 6.24, 12.8 (A. Hale, Lockwood Valley, CA, 0.20-m
reflector); 7.24, 12.8 (Hale).
PERIODIC COMET GIACOBINI-ZINNER (1984e)
H. Campins, Planetary Science Institute, communicates the
following infrared photometry, obtained with the 1.3-m telescope
at Kitt Peak on July 10.458 UT: aperture 11"1, J = 11.59 +/- 0.04,
J-H = +0.46 +/- 0.05, H-K = +0.19 +/- 0.04, L = 9.72 +/- 0.27; aperture
15"8, J = 11.19 +/- 0.04, J-H = +0.46 +/- 0.06, H-K= +0.13 +/- 0.08;
aperture 22"6, J = 10.91 +/- 0.02, J-H= +0.44 +/- 0.04, H-K = +0.21 +/-
0.06, L = 9.03 +/- 0.22.
R. H. McNaught, Siding Spring Observatory, notes the possibility
of detecting the P/Giacobini-Zinner meteor stream as a glow
in interplanetary space (cf. Baggaley 1977, Obs. 97, 123) during
the earth's passage through the comet's orbital plane on Oct. 8.55
UT. At that time glow from meteoroids approaching the earth would
extend in p.a. 263 from the radiant (R.A. = 18h38m, Decl. = +8.7 deg, equinox
1950.0), while glow from receding meteoroids would extend in p.a.
97 from the antiradiant. Owing to the narrowness of the stream,
observing conditions could vary considerably over several hours.
1985 August 8 (4092) Brian G. Marsden
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