sloan 3862SN2011az - my supernova discovery in IC3862 on 2011 Mar 18

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blue sne
Discovery of 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 !”.

Brief 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!

Before 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 Arbour, 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.
my observatorymy Meade 30cm SCT
 My equipment: 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 Park Observatory-UK.
iiop hct
SN 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.

upernova Patrol:  is organised by Guy Hurst [centre] with SN hunters Mark Armstrong, Nick James [BAA Papers Nick James, Mark Armstrong+Guy HurstSecretary-left] and Tom Boles [BAA Vice Tom Boles + John ToonePresident - right]. 

Following my 1st SN, Tom Boles
and Ron Arbour discovered three more within 17 days! SN2011az  SN sus  SN2011bc  SN2011bitype II P and L
sn type II
Time-line: 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.

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