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IAUC 5061: 1990T; PKS 2155-304, 3C 345, AND PG 1553+11; 1990d; FG Ser = AS 296

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                                                  Circular No. 5061
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     M. Hamuy, Cerro Tololo Interamerican Observatory; and J. Maza,
Astronomy Department, University of Chile, report:  "R. Antezana has
discovered a supernova 25" east and 2" south of the nucleus of an
anonymous galaxy.  The supernova (estimated mpg = 16.5) was found on
a 15-min 103a-O plate taken by Hamuy and L. Wells with the Curtis
Schmidt telescope on July 21.105 UT.  The galaxy is at R.A. =
19h54m58s.0, Decl. = -56 23'38" (equinox 1950.0).  Confirmation was
made by T. Williams (Rutgers University), who obtained UBVRI CCD
images with the CTIO 0.9-m telescope on July 26.  A spectrum (range
630-950 nm) obtained on the same night by M. Phillips with the CTIO
4-m telescope shows strong Si II 635-nm absorption, consistent with
a type-Ia supernova near maximum light.  A redshift of 0.040 for the
parent galaxy was measured from the same spectrum."

PKS 2155-304, 3C 345, AND PG 1553+11
     J. C. Noble, B. Mitch, M. T. Carini, and H. R. Miller, Georgia
State University, write:  "We have obtained CCD observations of the
blazars PKS 2155-304, 3C 345, and PG 1553+11 at Lowell Observatory
with the 1.05-m telescope + RCA CCD Camera.  PKS 2155-304 was found
to be in a bright state, with V = 12.74 +/- 0.04 on June 29 UT.  PG
1553+11 was also found to be in a bright state, with V = 13.90 +/-
0.04 on Mar. 4 and V = 13.83 +/- 0.04 on June 29.  3C 345 continues
to be near a minimum in brightness, with V = 17.28 +/- 0.05 observed
on June 29.  Further observations of these sources are encouraged."

     Total visual magnitude estimates (cf. IAUC 5026):  June 15.51
UT, 13.2 (A. Pearce, Scarborough, W.A., 0.41-m reflector); 20.44,
13.0 (D. Seargent, The Entrance, N.S.W., 0.25-m reflector); 23.23,
11.3 (C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector); 26.56,
13.0 (Pearce); July 13.20, 13.0 (A. Hale, Las Cruces, NM, 0.41-m
reflector); 15.24, 11.4 (Morris).

     IBVS 3476 equates AS 296 with FG Ser.  Visual magnitude
estimates (cf. IAUC 4886) by Pearce:  Mar. 23.87 UT, 10.3; Apr. 4.87,
10.6; 26.84, 10.6; May 1.86, 10.7; 20.85, 10.5; June 27.83, 10.6.

1990 July 26                   (5061)             Daniel W. E. Green

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