TA e-circular

<title>TA e-circular</title>
<pre>
THE ASTRONOMER Electronic Circular No 425        1990 June 27 19.40UT
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
---------------------------------------------------------------------
COMET McNAUGHT-HUGHES (1990g)
Preliminary parabolic orbital elements by B. G. Marsden, Center for
Astrophysics, from 9 observations June 19-23:
     T = 1991 Mar.  6.45 ET           Peri. =  27.31
                                      Node  = 234.52    1950.0
     q = 2.4159 AU                    Incl. = 131.47
     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     June 28    16 59.81    -63 58.5    2.789    3.600    16.8
     July  3    16 39.03    -62 37.5
           8    16 20.62    -61 00.9    2.762    3.527    16.7
          13    16 04.73    -59 12.2
          18    15 51.33    -57 15.2    2.776    3.455    16.6
          23    15 40.25    -55 13.3
          28    15 31.24    -53 09.6    2.826    3.384    16.5
IAUC 5037
 
PERIODIC COMET JOHNSON (1990h)
J. Gibson, OAO Corporation and Jet Propulsion Laboratory, reports his
recovery of this comet with the Palomar 1.5-m reflector(+ CCD + Gunn
r filter). The comet's image is stellar within the limits of seeing,
and the following positions are in agreement with the orbital
elements on MPC 12123 (ephemeris on MPC 15732):
     1990 UT             R.A. (1950) Decl.        m2
     June 17.37291   19 06 08.34   -15 15 42.3    18
          18.37122   19 05 35.29   -15 21 07.9              IAUC 5038
 
SUPERNOVA 1990N IN NGC 4639
A. Maury, Observatoire de la Cote d'Azur (OCA), reports the discovery
by E. Thouvenot of a supernova in NGC 4639 (R.A. = 12h40m21s,
Decl. = +13 31'.9, equinox 1950.0) on a 5-min unfiltered CCD exposure
taken by C. Buil, A. Maury, and L. Brunetto with the Pic du Midi
0.6-m telescope on June 22.964 UT.  A IIa-O plate taken by D.
Albanese on June 23.93 with the OCA 0.90-m Schmidt telescope shows
the object at mag about 15.5 and located 65" east and 1" south of the
galaxy's center.                                            IAUC 5039
 
SUPERNOVA 1990O IN MCG +03-44-003
J. Mueller reports her discovery of a supernova (mag 17) in
MCG +03-44-003 (R.A. = 17h13m.3, Decl. = +16 22', equinox 1950.0),
located 20".2 east and 3".4 south of the galaxy's center.  SN
1990O was found on a blue plate taken June 22 UT in the course of
the second Palomar Sky Survey with the 1.2-m Oschin Schmidt Tele-
scope.                                                      IAUC 5039
 
SUPERNOVA 1990P IN ANONYMOUS GALAXY
R. H. McNaught reports his discovery of an apparent supernova on a
U.K. Schmidt Telescope R plate taken by S. M. Hughes on June 22.5 UT.
The object (mag 19) is located at R.A. = 16h12m16s.01,
Decl. = -15 28'21".7 (equinox 1950.0), and is 3".6 west and 5".9
north of the galaxy's center.  No image is evident at this location
on J survey films.
IAUC 5039
 
T LEONIS
Patrick Schmeer, Federal Republic of Germany, reports that T Leo is
in outburst. On 1990 June 24.89UT he estimated it at 10.7 but it was
not recorded and fainter than 10.7 on June 19.
 
Q1990/54 - alert cancelled. Observational error.
 
Guy M Hurst
</pre>