[vsnet-alert 4086] BRIGHT SN 2000E in NGC 6951, which produced SN 1999el

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

cf: [vsnet-alert 3622] SN 1999el in NGC 6951
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/alert3000/msg00622.html
cf: [vsnet-chart 213] Chart of SN1999el
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00213.html
cf: [vsnet-chat 2369] Host galaxy of SN1999el
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg02369.html

Dear SN watchers,

  IAUC 7351 informed that the observer at Rome observatory has
discovered SN Ia 2000E in NGC 6951, which also produced SN IIn 1999el
last October.  The host galaxy is at about 1.7 times the Virgo
cluster, from which this SN is expectable to become quite bright.

  SN 2000E was discovered on Jan 26.73, and is located at R.A. =
20h37m13s.8, Decl. = +66o05'50".2 (2000.0), which is about 6" west and
27" south of the nucleus of NGC 6951.  This offset for westward is
somewhat inconsistent with the Right Ascension: it seems that R.A.
value would be smaller than above.  They also report that SN 2000E is
about 28" west and 24" south of SN 1999el, which was observed at
around mag 16 on 1999 Dec. - 2000 Jan.  Therefore, we can
simultaneously observe two SNe at one time!  

  The preliminary photometry of SN 2000E shows that V = 14.30 at Jan. 
26.73, B = 15.78 at Jan. 26.79, and near-infrared ones are also
performed.  The discoverers say no object was detected in
near-infrared images on Jan. 6.74.  A CCD image taken by K. Serneczky,
L. Kiss, and K. Sziladi on 1999 Dec. 31.79 UT also show nothing
brigher than mag 18.5. A dim blob (mag about 18.5) is seen around the
reported posision, but is probably due to the seeing mischief.

  NGC 6951 is type SABbc.  The central region elongates east to west,
and surrounded some arms.  SN 2000E is overimposed on the southern
inner arm.  There are many foreground stars around this galaxy, but a
few are in the southern part.  Bright (mag 12) star is located 1'.3
east of the galaxy.  

  The spectrum of SN 2000E obtained on Jan. 27.83 at Cima Ekar reveals
that it is of SN Ia a few days before maximum, and affected some
reddening by the interstellar medium.  The heliocentric recession
velocity of this galaxy is about 1400 km/s, and corrected value by the
rotation of Milky Way Galaxy is about 1700 km/s, from which the
expected maximum of unabsorbed SN Ia would be 13.5 mag or so.  Because
of low galactic latitude (b=15.8), however, the Milky Way reddening is
around A_V = 1 mag.  SN 2000E will be dimmer than 14 mag at maximum in
V, but in the longer wavelength such as raw CCD it can be brighter.
The follow-up photometry is extremely important for the light curve
determination of the rising phase. 

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

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