Central Bureau for Astronomical Telegrams
IAUC 7065: 1998ey; V4334 Sgr
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Circular No. 7065
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1998ey IN NGC 7080
Ron Arbour, South Wonston, Hants, U.K., reports his discovery,
on an unfiltered CCD image taken on Dec. 5.816 UT with a 0.3-m
f/6.3 Schmidt-Cassegrain reflector in the course of his supernova
patrol, of an apparent supernova (mag about 17.0) located at R.A. =
21h30m00s.56, Decl. = +26o43'24".2 (equinox 2000.0), which is about
18" west and 20" north of the center of NGC 7080. A prediscovery
image of the new star appears on a frame taken by Arbour on Dec.
4.651, but it is not visible on frames taken Nov. 1 or earlier
(limiting mag about 17.5). The new object is not present in
Vicker's atlas or the second Digitized Sky Survey. M. Schwartz,
Cottage Grove, OR, obtained an image of SN 1998ey at mag about
16.5 on Dec. 8.108, using the Tenagra I telescope in Sonoita, AZ.
V4334 SAGITTARII
G. Jacoby, Kitt Peak National Observatory (KPNO); and O. De
Marco, ETH Zentrum, Zurich, report: "The unusual variable star
V4334 Sgr (cf. IAUC 6322) has continued to fade and become redder,
further strengthening the argument for development of a dust shell
or shells. Photometric measures from the KPNO 0.9-m telescope on
1998 June 4.27 UT are: V = 12.40, U-B = +1.07, B-V = +1.89, V-R =
+1.38, V-I = +2.73. Observations by D. Willmarth at the WIYN 3.5-m
telescope on Oct. 8.10 show a major drop in the optical, with V =
18.09, B-V = +2.89, V-R = +2.31, and V-I = +4.32. Additional WIYN
data obtained by A. Saha and D. Harmer on Oct. 19.08 indicate a
partial recovery to V = 16.91, B-V = +3.05, V-R = +2.11, and V-I =
+3.77. The October data confirm reports on IAUC 7049 that V4334
Sgr had V > 15 during this period. Recoveries to V about 15 in
November (IAUC 7049) suggest a subsequent thinning of the October
dust shell. Spectroscopic data taken at WIYN by D. Sawyer with the
Densepak fiber-optic array on 1998 May 28.37 of the 420-nm CN band
indicate a larger bandhead index as defined by Jacoby et al. (1998,
A.J. 116, 1367) of 3.34 compared to an index of 2.32 during 1997
May and July. The increased band index is consistent with the
cooler/redder atmosphere and/or the presence of a detached shell."
(C) Copyright 1998 CBAT
1998 December 8 (7065) Daniel W. E. Green
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