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IAUC 3792: SNe; HERBIG-HARO 57; OJ 287

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IAUC number

                                                  Circular No. 3792
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758

     J. Maza, Department of Astronomy, University of Chile,
communicates the discovery by M. Wischnjewsky of a possible supernova
in NGC 7083, from a plate taken by L. E. Gonzalez on Apr. 14 UT.
The object, at mpg 18, is located 57" east and 10" south of the
galaxy's nucleus (R.A. = 21h31m8, Decl. = -64deg07', equinox 1950.0).

     R. W. Argyle, Royal Greenwich Observatory, telexes a precise
position from a plate taken by R. Wood of the NGC 4753 supernova
(mpg = 13.3 on Apr. 12.946 UT):  R.A. = 12h49m46s91, Decl. =
-10deg55'55".0, equinox 1950.0: offsets from nucleus: 17" west, 14"

     J. A. Frogel and J. A. Graham, Cerro Tololo Interamerican
Observatory, telex: "Recent observations with the 4-m telescope by
the former author of the newly-discovered starlike object in HH 57
(cf. IAUC 3785) reveal the object as a strong infrared source with
most of its power being radiated longward of 5 microns.  Infrared
photometry with the D2 bolometer system reveals the following magnitudes:
2.2 microns, 7.45 +/- 0.03; 3.5, 6.19 +/- 0.17; 4.8, 4.99 +/-
0.07; 10.0, 2.12 +/- 0.10; 20.0, 0.10 +/- 0.18.  The 10-micron emission
appears to originate in a region with a diameter < 2 arcsec centered on
the stellar source, which Graham identified with IRS 8 of Reipurth
and Wamsteker.  At 2.2 microns the source is ~ 0.7 mag brighter than
the value found by Reipurth and Wamsteker, whereas at 3.5 microns the
two measurements are the same.  The colors are quite similar to
those for FU Ori and V1057 Cyg, two other objects which have
exhibited marked brightening in the visual.  However, IRS 8 is the
first such object known to be associated with an HH emission
region. There is no obvious emission or absorption feature in the
10-micron window.  Images of the object obtained with the prime-focus
CCD system under conditions of subarcsec seeing confirm its stellar
nature.  Its profiles on V and B frames are indistinguishable
from those of stars in the field.  A low-resolution 900-A/mm
spectrogram obtained also with the CCD shows a red and essentially
featureless energy distribution."

OJ 287
     Visual magnitude estimates by J. Bortle, Stormville, NY: Mar.
21.0 UT, 13.8; 30.1, 14.1; Apr. 2.1, 13.9; 6.1, 14.0.

1983 April 19                  (3792)            Daniel W. E. Green

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