[vsnet-alert 7121] SN 2002ap in Messier 74 = NGC 628; further note

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

Dear SN watchers,

# As Kato-san noted, a subgroup "vsnet-campaign-sn2002ap" is created.
# Please use this group for further discussion.  Only the noteworthy
# reports will be appear on other subgroups (-alert, -campaign-sn).

  SN 2002ap seems brightening further.  Y. Sano, Nayoro, Hokkaido,
reports that it is mag 13.41 on Jan. 31.363 UT (unfiltered, compared
with USNO-A2.0 rmag).  It is surely rising.

  The new object locates on the outermost region of the spiral arm.
There are many foreground stars superimposed on and around M 74.  SN
2002ap locates between GSC 1205.789 and GSC 1205.744.  Sano's image
(http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/SNe/sn2002ap/sano0131.jpg)
will help the identification, as well as images in D. Bishop's page:
http://vsnet.RochesterAstronomy.org/supernova.html#2002ap , and
http://vsnet.RochesterAstronomy.org/sn2002/sn2002ap.html .

  The comparison stars with V magnitude (measured by A. Henden) is
available at AAVSO site http://vsnet.aavso.org/charts/PSC/SN2002AP/ ,
or Tycho-2 Vmag based one is available at:
http://vsnet.shopplaza.nl/astro/vs-charts/sn2002ap.htm , which are very
useful for a visual and V-filtered CCD observers.  The unfiltered CCD
observer, however, should use R magnitude or such.  Temporary,
USNO_A2.0 rmag would help.  

              Henden-V USNOrmag note
GSC 1205.1059   13.3    12.9    1' west of SN
GSC 1205.789    13.9    13.5    2' west of SN

  The distance measure of M74 is about 29.5.  The preliminary analysis
of the spectrum (See vsnet-alert 7120) reveals very unusual feature,
which resembles to that of "hypernova"!  The follow-up observation in
all wavelength is surely, strongly, highly recommended for this unique
and very interesting exploding object!

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

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp