Circular No. 5374
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 McNAUGHT-HUGHES (1991y)
     R. H. McNaught provides the following additional measurements
from films taken with the Uppsala Southern Schmidt telescope at
Siding Spring:
 
     1991 UT             R.A. (1950) Decl.
     Oct.  9.48056   23 07 01.37   -18 36 00.5
          12.60932   23 06 25.73   -18 27 02.1
 
     Improved orbital elements from 8 observations, Sept. 30-Oct. 12:
 
     T = 1991 June 16.320 ET          Peri. = 224.450
     e = 0.40190                      Node  =  89.333   1950.0
     q = 2.12527 AU                   Incl. =   7.299
       a =  3.55335 AU     n = 0.147145     P =   6.70 years
 
     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Oct. 31    23 07.96    -16 56.1    1.641    2.349    17.1
     Nov. 10    23 12.20    -15 44.6
          20    23 18.55    -14 21.5    1.915    2.411    17.6
          30    23 26.65    -12 49.6
     Dec. 10    23 36.21    -11 11.0    2.219    2.478    18.1
          20    23 46.97    - 9 27.3
          30    23 58.67    - 7 40.3    2.537    2.549    18.6
 
 
COMET HELIN-ALU (1991r)
     Orbital elements from MPC 18773:
 
     T = 1992 Feb. 20.0741 ET         Peri. =  30.8133
                                      Node  = 252.9525  1950.0
     q = 4.850069 AU                  Incl. =  49.3134
 
     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Oct. 31    17 04.55    -12 01.9    5.635    4.928    15.7
     Nov. 10    17 13.43    -11 35.2
          20    17 22.75    -11 05.9    5.765    4.903    15.7
          30    17 32.38    -10 33.0
     Dec. 10    17 42.24    - 9 55.9    5.822    4.883    15.7
          20    17 52.21    - 9 13.7
          30    18 02.20    - 8 26.0    5.803    4.867    15.7
 
 
1991 October 24                                   Daniel W. E. Green