TA e-circular

<title>TA e-circular</title>
<pre>
THE ASTRONOMER Electronic Circular No 418         1990 May 30
18.58UT
 Ed:Guy M Hurst, 16,Westminster Close,  Kempshott Rise,   Basingstoke,
 Hants, RG22 4PP, England. Telephone:   (0256)471074  Int:+44256471074
 Telex: 94082518 Answerback: TAGUY                 Microlink: MAG60138
 JANET:GMH @ UK.AC.CAM.ASTRONOMY.STARLINK or GUYH@UK.AC.SUSSEX.CLUSTER
 --------------------------------------------------------------------
The following items culled from recent IAUC's will no doubt be of
interest.


R CORONAE BOREALIS
      E. Waagen, AAVSO, reports that this variable is undergoing
 peculiar fluctuations in brightness.  Visual magnitude estimates
 (cf. IAUC 4885):  1989 Nov. 3.80, 6.4 (A. Pereira, Cabo da Roca,
 Portugal); 27.0, 6.2 (J. E. Bortle, Stormville, NY); Dec. 26.19,
 6.1 (P. Schmeer, Bischmisheim, West Germany); 1990 Mar. 5.12, 6.3
 (A. Boattini, Florence, Italy); 24.94, 6.2 (J. Shanklin, Cambridge,
 England); May 20.23, 5.9 (C. Scovil, Wrightwood, CA); 25.39, 6.6
 (Scovil); 26.25, 5.9 (Scovil, Big Bear, CA); 27.18, 5.6 (Bortle,
 Big Bear, CA); 29.18, 5.7 (Scovil, Wrightwood, CA
                       IAUC 5024
 

 1990 KA
  
      Orbital elements from 15 observations Mar. 23-May 26:
  
      T = 1990 June  9.2356 ET         Peri. = 146.4883
      e = 0.432797                     Node  = 105.1466  1950.0
      q = 1.247405 AU                  Incl. =   7.5666
        a =  2.199221 AU    n = 0.3022044    P =   3.261 years
  
      1990 ET      R.A. (1950) Decl.     Delta      r       V
      May  29    15 14.95    + 7 07.6    0.274    1.253    14.7
      June  3    15 19.00    + 4 50.4                          
            8    15 24.01    + 2 12.4    0.270    1.247    14.7
           13    15 30.01    - 0 42.2                          
           18    15 37.04    - 3 48.3    0.277    1.251    14.8
           23    15 45.09    - 7 00.2                          
           28    15 54.15    -10 12.0    0.295    1.262    15.0
      July  3    16 04.17    -13 18.1                          
            8    16 15.04    -16 13.6    0.324    1.281    15.3
  
  
                       IAUC 5025

  
 PERIODIC COMET PETERS-HARTLEY (1990d)
      R. H. McNaught, Siding Spring Observatory, reports his recov-
 ery of this comet with the Uppsala Southern Schmidt telescope, as
 given below; the coma is noted as diffuse.  The indicated correc-
 tion to the elements on MPC 12128 is Delta(T) = +2.0 days.  
  
      1990 UT             R.A. (1950) Decl.        m1               
      May  26.44271   11 51 27.91   -38 55 48.2    14  
           29.59606   11 58 22.56   -37 30 58.9    14  
  
      The improved orbital elements by the undersigned are from
 21 observations 1982-1990, mean residual 1".1:
  
                     Epoch = 1990 July  8.0 ET
      T = 1990 June 23.6412 ET         Peri. = 338.3169
      e = 0.597926                     Node  = 259.3939  1950.0
      q = 1.625774 AU                  Incl. =  29.8345
        a =  4.043467 AU    n = 0.1212197    P =   8.131 years
  
  
            D.W.GREEN  MAY 29  IAUC 5026

D.G.Buczynski. 
</pre>