[vsnet-alert 4944] SN 2000cm in FGC 1384

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Dear SN watchers,

  There are 3 supernovae reported their discovery in this month.
Among them, SN 2000cm is quite bright, well above mag 16.  

  SN 2000cm was discovered on May 31 UT on the Oschin Schmidt
near-infrared plate.  The reported location is R.A. = 12h12m59s.1,
Decl. = +7o17'53" (2000.0), which is 9" west and 6" north of the
center of the dim edge-on Sdm galaxy FGC 1384 = RFGC 2220.  On IAUC
7436 the host galaxy is called as anonymous, but it has been cataloged
in "Flat Galaxy Catalog" (Karachentsev et al., 1993) and its revised
version (Karachentsev et al., 1999).  

  The fine image with SN is kindly supplied by F. M. Ewalt at:
http://pages.prodigy.net/fmewalt/.wi_SN2000cm-1W.jpg .  It shows that
the offset is likely good enough (though the offset to north seems to
be slightly smaller than the real value), but the position seems to be
erroneous: SN lies about 10" north of the given declination.  Note
that the southeastern mag 14 star (USNO_A2.0 0900_07099845) has a
large (about 35"/c) proper motion towards southeast, and is cataloged
in NLTT as 554-81.  The precise astrometry of SN is strongly desired.

  The spectrum of SN 2000cm was obtained by CfA group on June 4 and 5,
which reveals that this SN is of type Ia about 2 weeks after maximum.
The recession velocity of the host galaxy is measured as 2170 km/s,
from which the maximum of typical SNe Ia on this galaxy is expected as
about mag 14.0.  D. Rodriguez estimates as 15.35C on June 5.86, which
seems somewhat dimmer than the expected value.  It can be due to the
extinction within the host galaxy or to the sub-luminous nature of SN.
Further magnitude estimates are encouraged.  

  The other two SNe are dimmer than 2000cm.  SN 2000cn in UGC 11064 is
of type Ia before or at maximum (from the spectrum). It was observed
as 16.9C on June 3.4, and the expected maximum is about 16.5.  
SN 2000co is somewhat distant (v_r = 11590 km/s) type-II SN.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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