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IAUC 4912: 1989v; 1989a1

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IAUC number 

                                               Circular No. 4912
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


COMET HELIN-ROMAN-ALU (1989v)
     Extension of the ephemeris on IAUC 4875, from the orbital
elements on MPC 15520:

     1989/90      R.A. (1950) Decl.     Delta      r       m1
     Nov. 30    19 56.46    +38 31.4    0.684    1.081    10.5
     Dec. 10    19 31.76    +42 35.5
          20    19 08.66    +46 10.5    0.783    1.050    10.7
          30    18 45.53    +49 30.9
     Jan.  9    18 20.42    +52 52.1    0.824    1.121    11.1
          19    17 50.18    +56 25.0
          29    17 09.37    +60 09.1    0.818    1.273    11.6
     Feb.  8    16 09.68    +63 29.5
          18    14 46.74    +64 56.5    0.818    1.473    12.2
          28    13 16.81    +62 48.4
     Mar. 10    12 07.22    +57 14.1    0.906    1.696    13.1
          20    11 23.98    +50 03.7
          30    10 59.47    +42 51.6    1.134    1.929    14.1
     Apr.  9    10 46.58    +36 22.9
          19    10 40.86    +30 49.4    1.487    2.165    15.2
          29    10 39.73    +26 06.8
     May   9    10 41.66    +22 06.4    1.923    2.400    16.2
          19    10 45.69    +18 39.2
          29    10 51.20    +15 37.6    2.406    2.632    17.1


COMET AARSETH-BREWINGTON (1989a1)
     Total visual magnitude estimates:  Nov. 19.74 UT, 9.1 (G.
Comello, Roden, The Netherlands, 0.20-m reflector); 21.01, 8.4
(G. Kronk, Troy, IL, 0.33-m reflector); 21.96, 8.6 (J. E. Bortle,
Stormville, NY, 20x80 binoculars); 23.07, 8.5 (A. Hale, Las
Cruces, NM, 10x50 binoculars); 26.22, 8.3 (P. Schmeer,
Bischmisheim, West Germany, 20x80 binoculars); 26.70, 8.0 (S.
Baroni, Sormano, Italy, 20x80 binoculars); 27.10, 7.5 (C. S.
Morris, Pine Mountain Club, CA, 20x80 binoculars); 27.74, 7.6
(J. D. Shanklin, Cambridge, England, 20x80 binoculars).
     Corrigendum.  On IAUC 4908, line -5, for  20x80 binoculars
read  0.26-m reflector


1989 November 28               (4912)             Daniel W. E. Green

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