Further Info on M74
This is a pre-nova image!! of M74 There is embedded info on this image.
Subject: 13th mag supernova in M74 (Fwd: AstroAlert: News from VSNET)SN 2003gd-13th Mag SuperNova in M74
(Image & plot of M74 in middle of page)
A bright supernova, SN 2003gd was discovered.
For more detail information about these objects,
see below, "VSNET Weekly Campaign Summary" of the last week.
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VSNET (Variable Star Network) is an international variable star
observing network, covering various
areas of novae, supernovae, cataclysmic variables (CVs), X-ray transients,
and other classical eruptive,
pulsating, and eclipsing variables. VSNET is one of invited contributing
organizations to the SkyPub
AstroAlert system.
The "News
from VSNET", mainly focusing on recent remarkable activities of CVs
and related systems,
is issued on a weekly basis, except on occasions of extremely urgent
or transient events. Please refer to
the VSNET Home Page for more details of events and objects listed.
VSNET provides a number of mailing lists, on which various news
and topics are discussed. Subscriptions
to the VSNET mailing lists are free of charge; please refer to the
instruction on the above page if a reader
needs more information of the list structure.
CCD observations of such targets are a relatively easy task for
a 20-40cm telescope; simply take as many
CCD frames (with exposure times 10-30 sec) as possible, spanning several
hours per night. The only requirements
are the weather and your patience! If you need more help on the
observing technique, please feel free to ask on
the vsnet-campaign list.
We would sincerely appreciate volunteers who would join
the VSNET Collaboration team to study the wonders
of these exotic variable stars.To join the VSNET campaign collaborative
list, send an e-mail to
The VSNET administrator
with a line "SUBSCRIBE vsnet-campaign." (VSNET campaign members
are strongly recommended to subscribe to
vsnet-alert at the same time).
Regards,
Taichi Kato
On behalf of the VSNET administrator team
Dear SN watchers,
According to IAUC 8150, R. Evans visually discovered a bright
(mag about 13.2) SN in M 74,
which has produced a 'hypernova' SN 2002ap last year. The new
object turned to be a type II SN.
The discovery was made on June 12.82 UT, in the twillight at
Australia. The precise position measured
from the image taken on the next night with 1.0-m Siding Spring Observatory
is:
R.A. = 1h36m42s.65, Decl. = +15o44'20".9 (J2000.0),
which is about 13" east and 161" south of the
center of the spiral galaxy M74 (=NGC 628). There is a
foreground star (red mag 12.4) with the position
end figures 32s.00, 45'08".7.
The first spectrum was taken on the same night at America, i.e.
June 13.46 UT = 0.64 days after discovery.
The IR spectrum shows a series of strong and broad hydrogen Paschen
emission lines, which indicates that is
it a type II SN around maximum. The explosion can occured when
it was behind the Sun. We are possibly
able to enjoy the bright SN for some weeks.
Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp
The following was issued on June 16, 2003, as VSNET campaign circulation
1397 [Note a
large part of detailed information is posted to vsnet-campaign sub-lists].
VSNET Weekly Campaign Summary *** Last week news ***
(new targets) SN 2003gd (RA = 01h36m42s.65, Dec = +15d44'20".9).....
which is about 13" east and 161" south of the
center of the spiral galaxy M74 (=NGC 628).
There is a foreground star (red mag 12.4) with
the position end figures 32s.00, 45'08".7.
A bright SN II 2003gd was
discovered in M74, the same galaxy as 'hypernova' SN 2002ap
(vsnet-campaign-sn 636, 637). The discovery
was made on June 12.82 UT at 13.2mag. The first
spectrum was taken on the same night at America,
i.e. June 13.46 UT = 0.64 days after discovery.
The IR spectrum shows a series of strong and
broad hydrogen Paschen emission lines, which indicates
that it is a type II SN around maximum
(vsnet-campaign-sn 638).
Spiral galaxy-M74 (NGC 628) Plot for 3:00 AM June 18,2003
Other IDs: UGC1149, MCG3-5-11, MESS74, PGC:
05974
Constellation Pisces
Magnitude:10.0
Dreyer Descr. gcL,F,vL,R,
vg,psmbM --Means-->gradually
considerally Large, Faint, very Large, Round,
very gradually, pretty suddenly much brighter
Middle (In TheSKY all these leters were uppercase, so I'm
having to interperate, Dreyer has UPPER
& lower case for almost all letters).
RA:01h 36m 51.5s Dec:+15d 47' 55"
2000 Epoch
**********************************************
Viewing Conditions for M74 taking
the Moon into account
******* 6/18/03 *******************************
MoonSet: 9:47 AM on 6/18/03
Rise: 12:24 AM
on 6/19/03
Transit: 5:34 AM on 6/19/03
Illum Phase 80.94 %
Problems w/ visual
******* M74@3:00 AM *******
Azm:79d 24' 58" Alt:+12d 04' 30"
Rise: 01:51 Transit: 08:49 Set: 15:47
Angular Distance above Horizon= 12d 05'
******* 6/28/03 *******************************
MoonRise: 4:19 AM on 6/28/03
Transit: 12:09 PM on 6/28/03
Set: 8:02 PM on 6/28/03
Illum Phase: 1.95 % Not a visual
problem
******* M74@3:00 AM *******
Azm:85d 34' 08" Alt:+19d 29' 02"
Rise: 01:11 Transit: 08:10 Set: 15:08
Angular Distance above Horizon= 19d 28'
******* 7/5/03**********************************
MoonRise: 11:34 AM on 7/5/03
Transit: 6:07 PM on 7/5/03
Set:
12:28 AM on 7/6/03
Illum Phase: 31.19 %
Problems for Visual
******* M74@3:00 AM *******
Azm:89d 58' 50" Alt:+24d 42' 52"
Rise: 00:40 Transit: 07:42 Set: 14:40
Angular Distance above Horizon=24d 43'
******* 7/26/03**********************************
MoonRise: 2:58 AM on 7/26/03
Transit: 10:53 AM on
7/26/03
Set:
6:49 PM on 7/26/03
Angular diameter=00d 30' 03"
Azm:54d 52' 51" Alt:-00d 38' 34"
Physical ephemeris
Illum. Phase: 8.74 %
Not a visual problem
******* M74@3:00 AM *******
Azm:104d 50' 28" Alt:+40d 15' 03"
Rise: 23:17 Transit: 06:20 Set: 13:18
Angular Distance above Horizon=40d 07' 34"
**********************************************************************
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