TA e-circular

<title>TA e-circular</title>
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THE ASTRONOMER Electronic Circular No 436         1990 Aug 10 10.29UT
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
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PERIODIC COMET HALLEY (1986III)
R.M.West, ESO, reports that CCD observations at r=12.5AU on 1990
Feb 21-24 with the Danish 1.5-m telescope at La Silla yield
variations in Johnson V between 23.7 and 25.0. The mean value of
24.4 is 0.35mag brighter than expected from the nucleus alone. No
coma is visible at the 29mag/arcsec2 level (1500 times less than the
sky background emission!). Halley seems to have entered a long period
of hibernation which is likely to last until mid-2061 when it again
comes within about 5AU from the Sun and will again be awakened by
the sunlight.
ESO Information Bulletin
 
SUPERNOVA 1990U IN NGC 7479
C. Pennypacker, S. Perlmutter and H. Marvin communicate: "The
Berkeley Automated Supernova Search reports the discovery of a
supernova 22" west and 54" south of the nucleus of NGC 7479 (R.A. =
23h02m26s, Decl. = +12d03'.1 (equinox 1950.0) and lying on a possible
H II region.  Images obtained on July 27.364, 27.365 and 27.408 UT
show the object at mag 16 +/-0.5.  The supernova was not present to
limiting mag 17.5 (90-percent-confidence limit) on an image obtained
on June 28."
IAUC 5063
 
PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1990f)
Ephemeris extension to E-424:
     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     Aug. 17     6 42.75    +15 29.9    0.416    0.766     9.8
          22     7 20.75    +16 05.2
          27     7 51.89    +16 12.6    0.579    0.643     9.0
     Sept. 1     8 18.94    +16 00.5
           6     8 43.84    +15 31.4    0.778    0.559     8.4
          11     9 07.75    +14 45.7
          16     9 31.10    +13 44.1    0.995    0.546     8.7
          21     9 53.77    +12 29.3
          26    10 15.41    +11 05.3    1.203    0.609    10.1
     Oct.  1    10 35.77    + 9 36.5
           6    10 54.73    + 8 06.6    1.384    0.721    11.9
IAUC 5072
 
TA INDEX
Denis Buczynski, Assistant E-Circulars Editor is now also available
on JANET. Using 'MAIL' his address is:
CBS%UK.AC.LANCS.CENT1::ESA123
Following the return of the Editor from Finland, all reports can
again be sent to the addresses at the top of this circular,
 
Guy M Hurst
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