TA e-circular

<title>TA e-circular</title>
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THE ASTRONOMER Electronic Circular No 490       1991 Feb 28 18.50UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP, England. Telephone:  (0256)471074 Int:+44256471074
Telex: 9312111261 Answerback: TA G              Microlink: MAG60138
JANET:GMH @ UK.AC.CAM.ASTRONOMY.STARLINK  GUYH@UK.AC.SUSSEX.CLUSTER
TELECOM GOLD: 10074:MIK2885                       PRESTEL 256471074
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MICROLINK
This will be the last circular issued to those on MICROLINK as the
latter service ceases tonight. The E-Circulars have been issued on
MICROLINK since 1987 Jan 24 when the first item was the discovery
announcement of Comet Nishikawa-Takamizawa-Tago (1987c).
To date no-one has definitely confirmed that they are switching to
the F.I.S. option and therefore I do not intend to retain a box on
that system. Effective from 1991 March 1, this service will
continue on JANET, its overseas equivalents and on TELECOM GOLD.
To date the following have already established GOLD facilities:
Mike Collins     10087:SQQ1294
Martin Ratcliffe 10083:PTM001
Tony Miller      10074:MIK2188
Tom Saville      10073:TTI107
Ian Townend      10074:MIK016
Dave McAdam      10087:YQQ587
Guy Hurst        10074:MIK2885
In addition we understand that the following are in the course of
setting up GOLD boxes:
Nick James, Graham Keitch, Martin Mobberley, Storm Dunlop.
Others are in the course of seeking facilities on JANET.
I am anxious that we do not lose anyone from the e-group and I
would appreciate a telephone call from any Ex-Microlinkers not
mentioned above with details of their future plans. If anyone is
subject to a delay in obtaining their new mailbox I can send paper
copies of the e-circulars for a period of up to one month upon
request.

R CRB VARIABLES
We have received a request from professional astronomers to monitor
all R CrB-type variables in the northern and southern skies and
to alert them if any start to fade. Please e-mail or telephone the
Editor if any fade is detected.

PERIODIC COMET SHOEMAKER-LEVY 4 (1991f)
Improved orbital elements by B. G. Marsden, Center for
Astrophysics, from 7 observations Feb. 9-25:
     T = 1990 July 19.492 ET          Peri. = 302.746
     e = 0.44452                      Node  = 151.304   1950.0
     q = 1.99809 AU                   Incl. =   8.433
       a =  3.59706 AU     n = 0.144472     P =   6.82 years
     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Feb. 23    12 03.61    + 4 07.3    1.677    2.602    17.3
          28    12 00.60    + 4 47.5
     Mar.  5    11 57.24    + 5 28.6    1.674    2.646    17.3
          10    11 53.65    + 6 09.8
          15    11 49.94    + 6 49.9    1.698    2.690    17.4
          20    11 46.25    + 7 28.0
          25    11 42.69    + 8 03.2    1.751    2.734    17.6
          30    11 39.37    + 8 34.8
IAUC 5198

Guy M Hurst
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