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IAUC 6172: 1995O; 71P; N Aql 1995

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                                                  Circular No. 6172
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM

     J.-F. Le Borgne, Observatoire Midi-Pyrenees; B. Sanahuja,
University of Barcelona; and S. Maddox, Royal Greenwich Observatory;
report their discovery of an apparent supernova located at R.A. =
16h35m56s.121, Decl. = +66o11'43".96 (equinox 2000.0), which is in
the cluster Abell 2218 (cf. Abell et al. 1989, Ap.J. Suppl. 70, 1),
and is 1" from arc 730 of Pello et al. (1992, A.Ap. 266, 6; note
Fig. 7).  The discovery was made on CCD images obtained on May 3.13
UT with the William Herschel Telescope (+ Low Dispersion Survey
Spectrograph) at La Palma, with the magnitude estimated as R about
22.  SN 1995O does not appear on any of numerous frames obtained of
this cluster since 1986, the last known images with no sign of the
new star being J and K frames taken on 1994 Aug. 18 with the
Canada-France-Hawaii Telescope (CFHT) at Mauna Kea.  Low-dispersion
spectrograms obtained by C. Soubiran (Observatoire de Bordeaux) and
E. Friel (Maria Mitchell Observatory) on May 7.49 and 7.51 with the
CFHT (+ multi-aperture spectrograph) show some signal between 450
and 900 nm, although the spectra are dominated by sky emission
lines at wavelengths longer than 720 nm.  Emissions at the redshift
of Abell 2218 (z = 0.175) corresponding to features at about 371.2,
464.5, 494.4, 551.1, and 584.8 nm (respectively) in the spectra of
the type-Ia supernova 1989B (Wells et al. 1994, A.J. 108, 2233)
were identified in the spectra of SN 1995O at 436.2, 545.8, 580.9,
647.5, and 687.1 nm.  Likewise, the absorptions in SN 1989B at
about 486.2, 504.7, 569.2, and 602.0 nm were identified in SN 1995O
at 571.3, 593.0, 668.8, and 707.3 nm.

     Visual magnitude estimates:  Apr. 1.47 UT, 13.5 (A. Hale,
Cloudcroft, NM, 0.41-m reflector); 23.45, 12.9 (C. S. Morris, Pine
Mountain Club, CA, 0.26-m reflector); 25.46, 12.4 (Hale); May 10.44,
11.6 (Hale).

     Visual magnitude estimates:  Apr. 21.43 UT, 10.5 (W. G.
Dillon, Missouri City, TX); May 1.17, 10.7 (A. Pereira, Cabo da
Roca, Portugal); 6.115, 11.7 (P. Schmeer, Bischmisheim, Germany);
9.065, 11.7 (Schmeer).

1995 May 11                    (6172)            Daniel W. E. Green

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