Central Bureau for Astronomical Telegrams
IAUC 4923: 1989d1; 1989a1
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Read IAUC 4924
Circular No. 4923
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET SCHWASSMANN-WACHMANN 3 (1989d1)
This comet has been independently recovered by J. Luu,
Massachusetts Institute of Technology; D. Jewitt and S. Ridgway,
Institute for Astronomy, University of Hawaii; and J. Gibson,
OAO Corporation and Jet Propulsion Laboratory. The positions
indicate a correction of Delta(T) = -0.05 day to the orbital
elements on MPC 12122 (ephemeris on MPC 15266):
1989 UT R.A. (1950) Decl. m2 Observer
Dec. 4.57196 12 12 46 +10 36 6 Luu
5.59105 12 14 31.2 +10 29 26 19.9 "
5.59435 12 14 31.6 +10 29 25 "
5.59961 12 14 32.1 +10 29 23 "
5.60260 12 14 32.4 +10 29 21 "
5.60690 12 14 32.9 +10 29 19 "
9.47793 12 21 10.45 +10 01 49.8 21 Gibson
9.48416 12 21 11.14 +10 01 47.0 "
9.48969 12 21 11.72 +10 01 44.5 "
9.49632 12 21 12.35 +10 01 41.9 "
12.48311 12 26 21.88 + 9 40 44.5 21 "
12.48794 12 26 22.39 + 9 40 42.6 "
12.49325 12 26 22.88 + 9 40 39.3 "
12.49867 12 26 23.47 + 9 40 37.4 "
J. Luu, D. Jewitt, and S. Ridgway (Mauna Kea). 2.2-m University
of Hawaii reflector. Mould R filter, 5".75 diaphragm.
Comet has a centrally condensed core with a tail in p.a. 298 deg.
J. Gibson (Palomar). 1.5-m reflector + CCD + Gunn r filter. On
Dec. 9, slight coma, 0'.1-0'.2 tail in p.a. about 285 deg.
COMET AARSETH-BREWINGTON (1989a1)
Total visual magnitude estimates (cf. IAUC 4921): Dec. 12.25
UT, 5.6 (B. H. Granslo, Blindern, Norway, 0.06-m refractor; 25' tail
in p.a. 350 deg); 13.50, 4.5 (Y. Sheffer, Austin, TX, 7x50
binoculars); 14.45, 5.3 (J. E. Bortle, Stormville, NY, 10x50
binoculars; 2.5-deg tail in p.a. 338 deg); 16.50, 3.6 (G. Kronk, Troy,
IL, 20x80 binoculars); 17.21, 3.7 (R. Haver, Tolfa, Italy, 15x80
binoculars; 2deg40' tail in p.a. 328 deg); 18.45, 4.0 (Bortle; 1-deg
tail in p.a. 323 deg).
1989 December 18 (4923) Daniel W. E. Green
Read IAUC 4924
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