Central Bureau for Astronomical Telegrams
IAUC 7105: 1999X; RX J0052.1-7319
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Circular No. 7105
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999X IN CGCG 180-22
M. Schwartz, Cottage Grove, OR, reports his discovery of an
apparent supernova (mag 16.1) on an unfiltered CCD frame taken on
Jan. 23.23 UT utilizing the Tenagra I 0.35-m automated supernova
patrol telescope in Sonoita, AZ, internet-controlled from Cottage
Grove. SN 1999X is located at R.A. = 8h54m32s.23, Decl. =
+36o30'41".1 (equinox 2000.0), which is about 4".1 east and 5".5
north of the nucleus of CGCG 180-22. The new object was confirmed
on a frame taken on Jan. 27.13 at mag 15.3, showing significant
brightening. Schwartz adds that the object does not appear on
either the first or the second Palomar Sky Survey scans, and that
it is absent from the USNO A1.0 catalogue.
P. Garnavich, S. Jha, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 1999X was
obtained and reduced by P. Berlind (Fred L. Whipple Observatory) on
Feb. 6.3 UT using the Tillinghast telescope. The spectrum shows a
strong Si II absorption feature with a minimum at 629.6 nm,
indicating that this is a type-Ia event. Other features suggest an
age between 7 and 10 days past maximum light. The recession
velocity of CGCG 180-22 is 7500 km/s (Ramella et al. 1995, A.J.
109, 1458), so that the supernova photospheric expansion velocity
derived from the Si II line is 10 050 km/s.
RX J0052.1-7319
A. Udalski, Warsaw University Observatory, on behalf of the
OGLE microlensing team, communicates: "The proposed optical
counterpart of RX J0052.1-7319 (cf. IAUC 7101) was identified in
the OGLE photometric database (object SMC_SC6 99923) as a long-term
variable star with quasiperiodic light variation of amplitude 0.13
mag in the I band; the possible period of about 600-700 days is
uncertain because of comparable length with the current 745-day
span of the OGLE SMC database (1997 Jan. 17-1999 Feb. 1). The mean
photometry of the star is V = 14.667, B-V = -0.005, V-I = +0.146
(cf. OGLE photometric maps of the SMC, Udalski et al. 1998, Acta
Astron. 48, 147). Photometry of the star is available from the
OGLE Internet archive at http://www.astrouw.edu.pl/~ftp/ogle."
(C) Copyright 1999 CBAT
1999 February 6 (7105) Daniel W. E. Green
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