Central Bureau for Astronomical Telegrams
IAUC 4258: 1986J; 1986l; EY Cyg
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Circular No. 4258
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
SUPERNOVA 1986J IN NGC 891
J. Gunn, Princeton University, reports that a spectrum of this
object obtained on Sept. 6 with the Palomar 5-m reflector shows
strong, but very narrow (linewidth 750 km/s), H-alpha emission and
features similar to those of eta Car, indicating that this is not a
typical supernova; observed Thuan-Gunn magnitudes were r = 19.4, i =
20.6, g [20.5. An observation made with the same telescope on 1984
Jan. 4 gave r = 18.3. M. Rupen, J. van Gorkom, and G. Knapp (cf.
IAUC 4248) communicate that radio observations made on 1986 Aug. 21
show 21-cm absorption that confirms the object to be in NGC 891;
Aug. 25 observations made with the Very Large Array also yield flux
densities of 50 mJy at 2 cm, 124 mJy at 6 cm, and 75 mJy at 20 cm.
The object was not detectable in 1984 Oct. observations by J. Condon
at 20 cm; 6-cm Westerbork observations indicate that it was detected
at 25 mJy in 1984 May but was not present in 1973. G. Fabbiano and
I. M. Gioia, Center for Astrophysics, report the 6-cm detection of
this source at 60 mJy in VLA data obtained in 1984 Sept. Optical
observers are encouraged to check images of NGC 891 obtained before
1984 Jan. that may reveal this supposed supernova.
COMET WILSON (1986l)
R. Decher, C. M. Telesco, and C. Sisk, Marshall Space Flight
Center, NASA; and H. Campins, Planetary Science Institute, write:
"The 10.8-micron-magnitude of comet 1986l on Sept. 6.31 UT was 5.89 +/-
0.22, obtained using the MSFC 20-bolometer spatial array at the
NASA Infrared Telescope Facility. This corresponds to 150 +/- 33 mJy
and does not include +/- 10 percent absolute calibration uncertainty.
Most of this flux is detected in one array pixel (4".0 x 4".3)."
Further total visual magnitude estimates: Sept. 8.83 UT, 10.7
(W. Hasubick, Buchloe, West Germany, 0.20-m reflector); 9.22, 10.4
(C. E. Spratt, Victoria, BC, 0.20-m reflector); 9.85, 10.8 (D.
Fischer, Koenigswinter, W. Germany, 0.25-m reflector); 10.43, 12.1
(A. Jones, Stoke, near Nelson, New Zealand, 0.30-m reflector);
12.27, 11.2 (A. Hale, Las Cruces, NM, 0.20-m reflector).
EY CYGNI
Further visual magnitude estimates (cf. IAUC 4252): Sept. 4.50
UT, 12.0 (S. Osao, Kanagawa, Japan); 5.82, 11.7 (M. Verdenet,
Bourbon-Lancy, France); 6.82, 12.0 (Verdenet); 7.83, 12.3
(Verdenet); 8.82, 12.5 (Verdenet).
1986 September 24 (4258) Daniel W. E. Green
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