Central Bureau for Astronomical Telegrams
IAUC 3962: Prob. SN IN NGC 7184; APPULSE OF SAO 186001 TO NEPTUNE; JUPITER I (IO)
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Circular No. 3962
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
PROBABLE SUPERNOVA IN NGC 7184
E. Waagen, AAVSO, informs us that R. Evans, Maclean, N.S.W.,
reported the discovery on July 20.52 UT of a suspected supernova
60" east and 65" north of the nucleus of NGC 7184 (R.A. = 21h59m9, Decl.
= -21deg04', equinox 1950.0). The object, of mag ~ 14, was
confirmed by T. Cragg at the Anglo-Australian Observatory.
APPULSE OF SAO 186001 TO NEPTUNE
J. Manfroid telexes that the close approach of Neptune to SAO
186001 on July 22 was photoelectrically monitored by F. Gutierrez,
R. Hafner, R. Vega and himself at the European Southern Observatory.
The observations were made under excellent atmospheric conditions
with the 0.50-m (I band) and 1.0-m (K band) telescopes at
La Silla between 1h23m and 8h00m UT. The time resolution applied
was 10 ms. No occultation of the star by the planet or by rings
was recorded to a detection limit of less than 2 percent. An
isolated occultation event of duration less than 2 s and with a
depth of 35 percent (in both filters) occurred at 5h40m UT; further
analysis of this and other possible events is underway.
JUPITER I (IO)
R. Howell and M. McGinn have found from 4.8-micron speckle
interferometry at the Infrared Telescope Facility on July 3 that 40
percent of the total flux from Io was coming from the vicinity of
the Loki volcano. W. Sinton and J. Goguen, observing at the same
facility and wavelength, but with a polarimeter, confirmed this
large flux from Loki on July 8 and 10; their polarimetric data
allowed them to place the thermal emitting region at longitude 303
+/- 5 deg, latitude +13 +/- 5 deg. When Loki crosses the central
meridian its augmentation of the apparent geometric albedo is greatest.
A nominal value for the true geometric albedo (without volcanic
emission) at 4.8 micron is 0.7. The following apparent 4.8-micron
albedos indicate a renewed vigor in the Loki volcanic eruption: Apr. 12,
Io central meridian 245, apparent albedo 0.93; May 30, 288, 1.01;
June 1, 321, 0.99; June 24, 311, 1.20; July 8, 295, 1.31; July
10, 312, 1.27; July 17, 298, 1.34 (observers Sinton and Goguen,
Sinton and Tittemore on July 17; the Apr. 12 and July 17 observations
were made with the University of Hawaii's 2.2-m telescope).
1984 July 23 (3962) Brian G. Marsden
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