YT - my
supernova discovery SN spectra quest
my spring DSO
images Bright Supernova my homepage
supernova discovery in IC3862 on
2011 Mar 18
SN in IC 3862: as an avid deepsky imager using brief exposures, I
regularly check galaxies on download for interlopers as
part of my SN patrol. The selection of faint IC 3862
was down to fate. I’d seen a Wikisky image and thought “that’s a
challenge for LP suburbia under the full moon !”.
exposures showed mag 16/17 stars and IC 3862’s core was a hazy spot
with a faint star in virtual contact. It got me wondering but I
moved on to a few bright Messiers before retiring. Next morning
stacked images showed the ‘star’ was not an artifact. That night
more images showed its position was constant [eg not an
asteroid] and absent from old internet images!
midnight I emailed Guy Hurst [UK SN Patrol], UK SN hunters Tom Boles
and Ron Arbour. Next morning Martin Mobberley recorded a confirmatory
image via an automated ‘scope in New Mexico. That evening Ron
Nick James and Denis Buczynski obtained further images. The
apparent supernova was m16.2 at discovery on 2011 March 18 and
rising. Tom Boles measured my
discovery images and submitting a claim on my
behalf with IAU TOCP as PSN J12535343+3605193.
I used my
backyard observatory 30cm Meade LX200 SCT at f/3.7 plus Starlight
Xpress Lodestar-C camera unfiltered. Given my severe light
pollution [I’m 9 miles from central London under Bortle 8-9 skies] my
discovery gives hope to all interested in this pursuit - just add good
technique, tenacity and a little luck. M.Gavin @ Worcester
spectrum + type: a SN is not officially recognised until
a spectrum is
taken - the Indian Institute of Astrophysics - Bangalore with its
robotic 2m RC telescope at 4,500m in the Himalyas obtained a spectrum
of my supernova on 2011 March 21 and classified it as a rarer Type IIP
SN [P = 'plateau'] and IAU published CBETelegram
#2680 as SN2011az.
UK Supernova Patrol:
is organised by Guy Hurst [centre] with SN hunters Mark Armstrong, Nick
James [BAA Papers Secretary-left] and Tom Boles [BAA Vice President -
Following my 1st SN, Tom Boles and Ron Arbour discovered three more
within 17 days! SN2011az
from the IIoA spectrum the supernova explosion is expanding at
12,000km/s [4% light speed] or earth to sun distance in <4 hours!.
The spectrum shows a SN [and host galaxy] redshift of z=0,014 =
180MLY distance so the SN occured long ago whilst dinosaurs roamed
earth. The solar system has made nearly a complete orbit of our
Milky Way galaxy in the intervening 180M years!
Type II supernova
are final core-collapse events for stars >9 solar masses and for
this Type IIP an extended period [~100days] at outburst magnitude.